104 MAINTENANCE OF TRAFFIC

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104.00 GENERAL

This Section sets forth the traffic control requirements necessary for the safe and continuous maintenance of traffic throughout the area affected by the work, and is intended to minimize inconveniences to the traveling public, while providing for the safety of motorists, pedestrians, and workers. Maintain vehicular and pedestrian traffic on or along any transportation facility as specified in the Contract Documents.
When speed of traffic is noted, this means the posted speed or prevailing travel speed, whichever is higher, unless otherwise specified.
All applicable Maintenance of Traffic equipment shall conform to NCHRP Report 350 and/or MASH 2016 criteria for Test Level 3.
When no longer needed, remove items used for temporary maintenance of traffic from the project site. All removed items shall become the property of the Contractor, unless otherwise specified.
Ensure that at least 90 percent of all reflective barrier markers, warning lights, and raised pavement markers are operational at any given time. Correct deficiencies within 24 hours after notification.
Upon initial installation, temporary traffic control signs shall have at least 70 percent of the reflectivity specified in 950.03 over 90 percent of the reflectorized surface. Channelizing devices shall have at least 80 percent of the reflectivity specified in 950.03 over 90 percent of the reflectorized surface.
Replace damaged traffic control signs within four hours of notification. Take necessary corrective action, as approved, to adequately warn and protect the public until the signs are replaced.
The Contract Documents will specify one or more of the items listed in the following sections. When work is specified to be accomplished under the Maintenance of Traffic item, the work will be incidental to the Contract price for Maintenance of Traffic.

104.01 TRAFFIC CONTROL PLAN (TCP)

104.01.01 DESCRIPTION
Develop and implement a TCP. The TCP will include the design and placement of items such as signing, pavement markings, delineation, channelization, barriers, crash cushions, and other items as required.
TCPs may be implemented within a single project or jointly between two or more projects. In situations where TCPs are jointly implemented, ensure that correct and nonconflicting guidance is presented to the traveling public.
Prior to commencement of Contract work, the successful bidder shall complete a Traffic Control Plan Certification. Indicate whether the Administration's TCP will be implemented (Option 1), the Administration’s TCP will be modified (Option 2), or a TCP will be developed (Option 3). Submit the TCP in writing to the Engineer at least 20 days prior to starting any work. Submit changes to the approved TCP in writing at least five days prior to implementing the change. For emergencies, the approval process will be completed within four hours. All changes to the TCP shall be approved in writing by the Engineer prior to implementation. Submit for approval supporting documentation containing an assessment of safety and mobility impacts of the modified or proposed TCP. Contact the Engineer to determine what level of detail and types of analysis are required for the assessment. No work shall begin until the required traffic control patterns and devices are in place.
Refer to Contract Documents for Work Restrictions.
When TCP Option 2 or Option 3 is selected, the following shall apply:
(a) Plans and revisions to plans shall be drawn to the same degree, likeness, and sophistication as that of the Contract Plans.
(b) Submittals shall be on sheets measuring 22 in. x 34 in. with a standard margin and a standard title block at the lower right corner approximately 4 in. x 8 in., or on 8-1/2 in. x 11 in. paper with a 1 in. margin and a title block.
Include the following information in the title block and in the order listed.
(1) Name of Contractor (and subcontractor, if applicable).
(2) Address of Contractor (and subcontractor, if applicable).
(3) Sheet Title.
(4) Administration Contract Numbers and complete Federal Aid Number.
(5) "Prepared for Maryland Department of Transportation State Highway Administration."
(6) Signature block for approval by Contractor's Traffic Manager and date of approval.
(c) All lines shall be clean, sharp, solid, and heavy enough for adequate reproduction. The scale of phase details on the TCP shall be 1 in. equals 100 ft. Additional plans that revise the design plans shall be at the same scale as the Contract Plans.
(d) Do not use white pigment to cover lines.
(e) Plans shall indicate the proposed traffic movements throughout the area affected by the work for each phase of construction. Label all routes, and show north arrow and any other information that would clarify the TCP.
Any monetary savings from changes to the TCP made by the Contractor and approved by the Engineer will be divided equally between the Contractor and the Administration.
104.01.02 MATERIALS
Not applicable.
104.01.03 CONSTRUCTION
Not applicable.
104.01.04 MEASUREMENT AND PAYMENT
Any traffic control plan developed by the Contractor will not be measured but the cost will be incidental to other pertinent items specified in the Contract Documents.

104.02 MAINTENANCE OF TRAFFIC (MOT)

104.02.01 DESCRIPTION
Maintain traffic safely and efficiently through and around the area affected by the work.
104.02.02 MATERIALS
Traffic Materials       Section 950
104.02.03 CONSTRUCTION
(a) Maintenance of Existing Roadway. Maintain the existing roadway surface and shoulders, including crossroads, ramps, approaches, crossovers, medians, detour roads, entrances, and pavement markings within the limits of the project, throughout the duration of the Contract.
Repair potholes, shoulder defects, and hazardous conditions that exist or develop throughout the duration of the Contract.
(b) Existing Regulatory Signs, Warning Signs, Guide Signs, and Pavement Markings. Relocate, turn, completely cover with opaque material, or remove with the approval of the Engineer, signs that are not applicable due to temporary traffic conditions. Properly redisplay signs to traffic as soon as conditions warrant. Replace any signs misplaced or damaged by the Contractor's operations.
Prior to construction and in the company of the Engineer, inventory and note the location, type, size, and color of all existing pavement markings, legends, and symbols. Submit the results on a marked up set of the Contract Plans or on Contractor prepared sketches or drawings.
(c) Storage and Movement of Equipment, Material, and Vehicles. All equipment, material, storage, and parking areas shall have advance written approval from the Engineer. Employee vehicles shall not be parked within the right-of-way of the through highway, without a written exception. Equipment and material shall not be stored or permitted to stand in unprotected areas or open areas within 30 ft of traffic except as follows:
(1) Approved traffic barrier is in place prior to storage of equipment and materials.
(2) Equipment and material is at least 4 ft behind traffic barrier as measured from the bottom, nontraffic side of the barrier.
(3) Equipment or material is stored in conformance with the AASHTO Roadside Design Guide.
Restore areas used for storage of equipment and material to original condition immediately upon completion of use, at no additional cost to the Administration.
Vehicles and equipment shall enter and leave the work area in the direction of traffic flow.
Work on or adjacent to the traveled way shall be performed in the direction of traffic flow, unless written approval is obtained prior to beginning the work.
The Contractor's vehicles and equipment shall enter on and exit from the roadway at interchanges or legally allowed public use crossovers. Do not make U-turns across medians and crossovers signed FOR USE OF AUTHORIZED AND EMERGENCY VEHICLES ONLY, without written approval.
(d) Warning Lights and Devices. Use warning lights and flags on warning signs as specified in the TCP, the Contract Documents, or as directed. During hours of darkness, attach one Type A low intensity flashing warning light to the traffic side of channelizing devices used to warn of a spot hazard. Attach two Type A low intensity flashing warning lights to the top of each Type III barricade.
(e) General Requirements for Temporary Pavement Markings (TPMs). For pavement marking dimensions refer to Pavement Marking Dimension Table following (f)(10) below.
(1) Temporary pavement markings are those markings placed upon the roadway to serve an area of work activity or a work phase for a period of time after which they are to be removed.
When approved, a less than full complement of pavement markings and reduced dimension markings for dashed center lines and lane lines may be used, but for a period of not more than two weeks.
(2) TPMs may be either full dimension or reduced dimension as specified in the Contract Documents or as directed.
(3) Full dimension TPMs shall be in accordance with the MdMUTCD and the Pavement Marking Dimension Table following (f)(10).
(4) Reduced dimension TPMs shall be in accordance with the MdMUTCD and the Pavement Marking Dimension Table following (f)(10), except that the dashed center lines and lane lines may consist of 4 ft segments and 36 ft gaps.
(f) Specific Requirements for TPMs.
(1) As a minimum, place all center and lane lines at the close of each day.
(2) During the work day, while work activities are underway, clearly define all vehicle paths by center and lane lines, channelizing devices, signs, or other traffic control devices.
(3) Along two-lane, two-way roadways, place a center line consisting of a continuous double solid yellow center line, a single dashed yellow center line at full dimension, or a single dashed yellow center line at reduced dimension as directed.
(4) Mark and sign ‘no passing zones’ as specified or as directed. A no passing zone may be identified by signing for a period not to exceed seven days.
(5) Along multilane undivided roadways, identify the center line using a continuous double solid yellow line.
If a two-way left turn is present, see (6) below.
If the roadway is three lanes, the center line may be either a continuous double solid yellow center line or, where passing is permitted in the single lane direction, a continuous single solid yellow and single dashed yellow combination center line. For the placement of no passing zones, see (f)(4) above.
(6) Along multilane undivided roadways having a two-way left turn lane, the left-turn lane need not be marked provided that the lane is continuously delineated using channelizing devices spaced at no more than 200ft. The devices shall separate the opposing flows of traffic and provide areas where left-turning vehicles may store while awaiting the opportunity to turn.
(7) Along multilane roadways having reversible lanes, mark the lanes with the full complement of pavement markings as described in the MdMUTCD.
(8) Where edge lines are not in place, delineate the edge of the roadway by using appropriate channelizing devices or other delineation.
(9) Specific pavement marking and complementary signing details are shown on the Temporary Traffic Control (TTC) Typical Applications.
(10) Contact the Office of Materials Technology (OMT) for the latest approved TPM materials.
PAVEMENT MARKING DIMENSION TABLE
LINE TYPE MATERIAL REQUIRED MINIMUM EFFECTIVE WIDTH, in.
EXPRESSWAYS AND FREEWAYS OTHER ROADWAYS
Lane Lines Paint 5 5
Preformed Tape 5 5
Lane Shifts, Lane Divides and Severe Alignment Changes Paint 5 5
Preformed Tape 5 5
Center Lines *See Note Paint 5 5
Preformed Tape 5 5
Edge Lines Paint 5 5
Preformed Tape 5 5
Ramp Edge Lines Paint 5 5
Preformed Tape 5 5
Gore Marking Paint 10 10
Preformed Tape 10 10
Auxiliary Paint or Preformed Tape Same as particular line being extended Same as particular line being extended
Note: Provide a discernible space of 4 in. to 5 in. between double lines.
(g) Channelizing Devices. Install traffic channelizing in accordance with the MdMUTCD, the Contract Documents, and the following:
(1) Spacing in feet for channelizing devices in a taper shall be no more than the posted speed limit in mph.
(2) Spacing in feet for channelizing devices in a tangent shall be no more than twice the posted speed limit in mph.
(3) To define interchange gore areas or other unusual alignments, space channelizing devices at 25 ft intervals, unless the Engineer directs a closer spacing.
(4) Space channelizing devices at approximately 6 ft intervals at driveways and intersections, so that sight distance at these locations is not restricted.
(5) The Contractor’s name or identification mark may be placed in an inconspicuous location on the channelizing device, facing away from traffic. No advertising is permitted.
104.02.04 MEASUREMENT AND PAYMENT
Unless otherwise specified, Maintenance of Traffic will not be measured but will be paid for at the Contract lump sum price. The payment will be full compensation for relocating, turning, completely covering and uncovering or removing and resetting, maintaining in like new condition, and cleaning existing and temporary traffic signs and other traffic control devices. Included is the inventory of all existing pavement markings and the treatment of any other traffic control device not included in these Specifications but necessary for the fulfillment of the Contract requirements and implementation of the approved Traffic Control Plan, and for all material, labor, equipment, tools, and incidentals necessary to complete the work. Payment of the Contract lump sum price will be prorated and paid in equal amounts on each monthly estimate. The number of months used for prorating will be the number estimated to complete the work.
(a) When additional Contract pay items for Maintenance of Traffic are specified in the Contract Documents, measurement and payment will conform to the pertinent pay items.
(b) Cones, reflective collars, anchoring devices, STOP/SLOW paddles, sign flags, and warning lights will not be measured but the cost will be incidental to the Contract price for Maintenance of Traffic unless otherwise specified.
(c) Temporary traffic control devices that need replacement shall be replaced immediately, as directed. The cost of replacement, including all material, labor, equipment and tools, will not be measured but will be incidental to the Contract price for Maintenance of Traffic except when specifically set up in the Contract Documents as a separate Contract pay item.
(d) Material, equipment, and labor necessary for the construction and removal of temporary or detour roads will be measured and paid for at the Contract unit price for the pertinent items used.
104.02.04.01 When specified in the Contract Documents, Maintenance of Traffic will be measured and paid for at the Contract price per unit day.
104.02.04.02 When there is no item in the Contract Documents, maintenance of traffic will not be measured but the cost will be incidental to other pertinent items specified in the Contract Documents.

104.03 TEMPORARY RAISED PAVEMENT MARKERS (RPMs)

104.03.01 DESCRIPTION
Furnish, install, and remove as necessary, temporary RPMs.
104.03.02 MATERIALS
Temporary RPMs      QPL
104.03.03 CONSTRUCTION
Install temporary RPMs, as specified in the Contract Documents and in accordance with the manufacturer's recommendations.
104.03.04 MEASUREMENT AND PAYMENT
The payment will be full compensation for all material, labor, equipment, tools, and incidentals necessary to complete the work.
Increases or decreases in quantities will not be a basis for renegotiation of the Contract unit price.
(a) Temporary Raised Pavement Markers will be measured and paid for at the Contract unit price per each.
(b) Removal of Temporary Raised Pavement Markers will be measured and paid for at the Contract unit price per each.
(c) Reimbursement will be made at the Contract unit price for each marker damaged by snowplow operations.

104.04 TEMPORARY CONCRETE TRAFFIC BARRIER (TCB) FOR MAINTENANCE OF TRAFFIC

104.04.01 DESCRIPTION
Furnish, place, reset, and remove TCB.
104.04.02 MATERIALS
Precast Concrete Traffic Barrier       950.01
Vertical Panels and Reflective Barrier Markers       QPL
TCB shall conform to NCHRP Report 350 and/or MASH 2016 criteria for Test Level 3.
104.04.03 CONSTRUCTION
Maintain TCB in alignment and in a like new condition.
Remove and relocate TCBs as directed.
Install reflective barrier markers and vertical panels (object markers) on the TCB as specified.
Connections. In addition to the pin and loop connection shown on the Standards, the channel splice, vertical I beam, and lapped joint connections specified in the AASHTO Roadside Design Guide, and the proprietary T-Lok and J-J Hook Systems will be allowed provided only one type of joint connection is used for the length of the barrier.
104.04.04 MEASUREMENT AND PAYMENT
The payment will be full compensation for furnishing, placing, maintaining and removal from the project site as directed, and for all material, labor, equipment, tools, and incidentals necessary to complete the work.
(a) Temporary Concrete Traffic Barrier for Maintenance of Traffic and Reset Temporary Concrete Traffic Barrier for Maintenance of Traffic will be measured and paid for at the Contract unit price per linear foot measured along the center line of the top of the barrier.
The payment for Reset Temporary Concrete Traffic Barrier for Maintenance of Traffic will include removal from its original placement, transporting, and resetting it in its new temporary location.
(b) Reflective Barrier Markers and Vertical Panels will be measured and paid for at the Contract unit price per each.

104.05 TRAFFIC BARRIER W BEAM (TBWB) FOR MAINTENANCE OF TRAFFIC

104.05.01 DESCRIPTION
Furnish, install, maintain, reset, and remove temporary TBWB.
104.05.02 MATERIALS
Traffic Barrier W Beam       918.01
Traffic Barrier Posts       918.02
Hardware for Traffic Barriers       918.03
Wood Offset Blocks       918.04
Composite Offset Blocks       Section 605
TBWB shall conform to NCHRP Report 350 and/or MASH 2016 criteria for Test Level 3.
104.05.03 CONSTRUCTION
TBWB. Use construction methods in accordance with the applicable portions of Section 605.
TBWB Replacement. Immediately replace damaged portions of the TBWB. Install the TBWB to the correct horizontal and vertical alignment using offset blocks in kind.
TBWB Reset. When work is sufficiently completed through a traffic control area and TBWB is no longer required, remove and reset the TBWB and all components to a new work area as specified. Restore the previous location to original condition.
BWB End Treatments. 104.09 and 104.10.
Place an approved end treatment at all ends of TBWB prior to opening to traffic.
104.05.04 MEASUREMENT AND PAYMENT
The payment will be full compensation for furnishing and installing all cables, posts, brackets, traffic barrier W beam, hardware, galvanizing, excavation, backfilling, connections to rigid structures, removal, restoration of the area, and for all material, labor, equipment, tools, and incidentals necessary to complete the work as directed.
(a) Traffic Barrier W Beam for Maintenance of Traffic will be measured and paid for at the Contract unit price per linear foot.
(b) Replacing sections of the traffic barrier that have been damaged by vehicular traffic while in place will be measured and paid for at the Contract unit price per linear foot for the Traffic Barrier W Beam Replacement for Maintenance of Traffic item.
(c) Reset Traffic Barrier W Beam for Maintenance of Traffic will be measured and paid for at the Contract unit price per linear foot.
(d) Temporary Traffic Barrier End Treatments will be measured and paid for at the Contract unit price per each.

104.06 TUBULAR MARKERS

104.06.01 DESCRIPTION
Furnish, install, and remove tubular markers for maintenance of traffic.
104.06.02 MATERIALS.
Tubular Markers                                          QPL
Reflectorization                                          950.03
Tubular Markers may be manufacturer-certified as NCHRP Report 350 and/or MASH 2016 compliant as long as there are no attachments to the device.
104.06.03 CONSTRUCTION
Install tubular markers as recommended by the manufacturer and as approved by the Engineer.
104.06.04 MEASUREMENT AND PAYMENT
Tubular Markers will be measured and paid for at the Contract unit price per each. The payment will be full compensation for removal and for all material, labor, equipment, tools, and incidentals necessary to complete the work.
Tubular markers damaged due to traffic operations will be measured and paid for at the Contract unit price per each for Replacement of Tubular Marker Mast. If the base detaches from the pavement, replace the entire tubular marker assembly at no additional cost to the Administration, unless damaged by Administration snow removal operations.

104.07 ARROW PANEL (AP)

104.07.01 DESCRIPTION
Furnish and place APs for temporary use.
104.07.02 MATERIALS
Arrow Panel       QPL
104.07.03 CONSTRUCTION
Furnish and test the APs as directed 24 hours in advance of actual use. The AP unit shall conform to the Arrow Panel table and be arranged with double pointed arrow configuration capable of displaying a left arrow, right arrow, double arrow, and a four corner caution mode. A sequential chevron shall not be displayed.
Furnish APs that are self-contained, vehicle-mounted or portable, and approved. Use self-contained trailer units unless otherwise specified.
Provide APs that have both manual and automatic dimmer devices capable of reducing the light intensity by 50 percent. Periodically clean the photocells in order to prevent malfunctioning of the brightness control. Dimmer devices are mandatory during night operation. The devices shall include a fail-safe system that ensures maximum brightness during daytime operations and a reduction in brightness of up to 50 percent during periods of darkness, regardless of which dimmer device is operational.
The APs shall provide full illumination within at least a 24-degree cone perpendicular to the panel face.
Power Supply. The AP shall operate from a solar powered electrical system and consist of battery power and solar array panels, and be capable of providing power supply to the AP for 21 consecutive days without auxiliary charge.
ARROW PANEL
AP UNIT MdMUTCD TYPE LAMP OPTIONS*
No. 4412 A-Par 46 No. 4415A 1295 GE
Portable A, D X X
Vehicle Mounted B X
Self-Contained Trailer C X
∗Or as approved.
Arrow Board Type Minimum Size Minimum Legibility Distance Minimum Number of Elements
A 48 in. x 24 in. 1/2 mile 12
B 60 in. x 30 in. 3/4 mile 13
C 96 in. x 48 in. 1 mile 15
D None* 1/2 mile 12
∗Length of arrow equals 48 in. width of arrowhead equals 24 in.
Use an AP to close any lane of a multilane highway. Place APs as specified. Maintain APs in good operating order.
(a) The AP shall conform to the applicable requirements of the MdMUTCD and only be used to supplement other required traffic control devices. Use the "Arrow" mode when closing a through travel lane on a multilane roadway. Place only one AP in the "Arrow" mode for each stationary lane closure. Moving work operations may utilize one or more APs for a single lane closure. Ensure that placement does not cause driver confusion near ramps, median crossovers, and side road intersections.
(b) Aim the AP at approaching traffic in conformance with the minimum legibility distances specified above. Ensure that the display is level.
(c) For stationary lane closures, place the AP on the shoulder at the beginning of the taper (nearest to oncoming traffic). Where there are narrow or no existing shoulders in the closed lane behind the channelizing devices, place the AP as near to the beginning of the taper as possible.
(d) For a lane closure on a two-lane, two-way roadway, or for a shoulder closure on any roadway, use the “Caution” mode. In "Caution" mode, one light is displayed in each corner.
(e) For moving operations, refer to 104.23.
104.07.04 MEASUREMENT AND PAYMENT
Arrow Panels will be measured and paid for at the Contract price per unit day. A unit day will consist of any approved usage within a work shift, regardless of start time or whether the shift runs into another calendar day. Each arrow panel will be paid for only once per unit day, regardless of how many times it may be relocated. When an arrow panel is used for part of a day, it will be measured and paid for as a unit day. When operations require continuous 24-hour use of an arrow panel, the unit day will be measured as 24 hour periods from start to finish.
The payment will be full compensation for all material, labor, equipment, tools, and incidentals required to set up and operate at the site as required, and at any relocated site as specified and as directed.

104.08 TEMPORARY TRAFFIC SIGNS (TTS)

104.08.01 DESCRIPTION
Furnish, install, and maintain TTS on or along all transportation facilities.
104.08.02 MATERIALS
Wood Sign Supports       921.05 and 921.06
Square Perforated Tubular Steel Sign Supports       As Approved by the Office of Traffic and Safety
Reflectorization       950.03
Signs       950.08
Portable Sign Supports, Composite Aluminum Signs, Plastic Signs, and Flexible Roll Up Signs       QPL
Temporary Traffic Sign Supports shall conform to NCHRP Report 350 and/or MASH 2016 criteria for Test Level 3.
104.08.03 CONSTRUCTION
Place signing in accordance with the MdMUTCD, the Administration’s Standard Highway Sign Book (SHSB), and the Contract Documents. All work area warning signs shall be 48 in. x 48 in. unless otherwise specified. The SHSB may be obtained from the Office of Traffic and Safety, Traffic Engineering Design Division. Designs of signs not included in the SHSB may be prepared by the Contractor in sketch form, to scale, and for approval. Sign designs may be obtained upon a seven-day request to the Office of Traffic and Safety. Make requests in written form directed to the Engineer.
Mount signs that will be in place for more than three working days on two 4 in. x 4 in. wood posts or on two 2 in. x 2 in. square perforated tubular steel posts, unless otherwise specified. Mount the sign at a height of at least 7 ft or as specified. Do not place any additional bracing on wood posts unless the sign is behind the protective barrier. The tops of the wood posts shall not protrude more than 3 in. beyond the nearest edge of the sign. Place 4 in. x 4 in. wood posts at least 4 ft into the ground. Place 4 in. x 6 in. wood posts at least 5 ft into the ground.
Signs on portable supports shall be mounted so that the bottom of the sign is at least 1 ft above the roadway pavement elevation. Portable sign supports shall be self-erecting, able to withstand a wind velocity of 70 mph, and able to maintain themselves within five degrees rotation around their vertical axis.
Use the following minimum thickness for fabricated aluminum signs mounted on wood or steel tubular posts.
LONGEST DIMENSION OF SIGN (in.) MINIMUM THICKNESS (in.)
≤ 12 0.040
12+ to 24 0.063
24+ to 36 0.080
36+ to 48 0.10
> 48 0.125
When composite aluminum, plastic, or flexible roll up signs are used on portable supports, the support shall be approved by the Office of Traffic and Safety to hold that sign material. When supported on portable sign supports, composite aluminum signs shall be at least 0.08 in. thick.
TTS shall not be installed until inspected and approved. Do not display signs to traffic until directed. Properly maintain the TTS, leave in place while applicable, and remove immediately when no longer required. When operations are performed in phases or stages, only signs that apply to the present conditions shall be displayed to traffic.
Properly space the signs along the highway to provide adequate sight distance to work zone signs and existing signs. When a sign is not indicative of actual conditions, such as during periods of temporary shutdown or extended periods of no work being performed (including lunchtimes and overnight periods), either remove the entire work zone setup and remove the sign, turn it away from all traffic (turning parallel to traffic is prohibited), or completely cover it with an approved opaque material. This will not be required for nonwork periods up to one hour.
Ensure that signs are not obscured or obstructed, and that they meet all specified sight distance requirements.
Use reflectorized TTS for both daytime and nighttime use.
Maintain sign faces free of tape, tape residue, or any other foreign matter. Remove all advertisements from signs and supports. Ensure that supplemental signs do not cover any part of the face of the primary sign.
Sign Replacement. Maintain signs in a new or like new condition. When directed, replace signs that become faded, illegible, or damaged. Signs that are not new may be used only if the reflective intensity at a divergence angle of 0.2 degrees and incidence angle of minus 4 degrees conforms to at least 70 percent of the values specified in 950.03 over 90 percent of their reflectorized surface. At other times throughout the duration of the Contract, the sign reflectivity intensity shall be at least 60 percent. The acceptability of the signs shall be determined by 1 ft square test plates calibrated in accordance with these requirements.
104.08.04 MEASUREMENT AND PAYMENT
Temporary Traffic Signs will be measured and paid for at the Contract unit price per square foot for the pertinent Temporary Traffic Sign item. The payment will be full compensation for furnishing the signs and supports, installation, relocation, maintenance, cleaning, replacement due to non-traffic damage and normal wear, removal, and for all material, labor, equipment, tools, and incidentals necessary to complete the work.
Where signs have been set and damaged by traffic and the Engineer determines that they are not repairable, replacement will be measured and paid for at the Contract unit price.
When no longer needed, temporary traffic signs and all associated materials and incidentals shall be removed from the project site and become the property of the Contractor.

104.09 TEMPORARY TRAFFIC BARRIER END TREATMENTS

104.09.01 DESCRIPTION
Furnish, install, maintain, reset, and remove temporary traffic barrier end treatments in conformance with the manufacturer's recommendations or as directed.
104.09.02 MATERIALS
Temporary Traffic Barrier End Treatments       Refer to the Contract Documents or QPL
Temporary Crash Cushion Sand Filled Plastic Barrels (SFPB)       104.10.02
Temporary Traffic barrier End Treatments shall conform to NCHRP Report 350 and/or MASH 2016 criteria for Test Level 3.
104.09.03 CONSTRUCTION
Temporary End Treatments
(a) Install Temporary Traffic Barrier End Treatments as specified on the Plans and the Book of Standards and according to the manufacturer’s instructions.
The nose section shall be reflectorized as approved by the Office of Traffic & Safety.
(b) Install SFPB as specified in 104.10.03.
Inspection of End Treatments
(a) Perform a daily visual inspection of the devices to ensure that no damage has occurred, and that the end treatment is capable of functioning as intended.
(b) Following an impact, an approved reflectorized drum will suffice temporarily as reflectorization for the end treatment. Repair or replace the damaged end treatment within four hours after notification.
104.09.04 MEASUREMENT AND PAYMENT
Temporary Traffic Barrier End Treatments, Remove and Reset Temporary Traffic Barrier End Treatments, and Repairing Temporary Traffic Barrier End Treatments will be measured and paid for at the Contract unit price for one or more of the items listed below unless otherwise specified.
(a) Temporary Traffic Barrier End Treatments will be measured and paid for at the Contract unit price per each for the type specified. The payment will be full compensation for all material, labor, equipment, tools, and incidentals necessary to provide a complete temporary traffic barrier end treatment.
(b) Temporary crash cushion sand filled plastic barrels will be measured and paid for as specified in 104.10.04.
(c) Remove and Reset Temporary Traffic Barrier End Treatments will be measured and paid for at the Contract unit price per each for the type specified. The conditions specified for the initial installation and removal of the end treatment shall be applicable to removing and resetting the end treatment.
(d) Temporary Traffic Barrier End Treatment Spare Parts Package furnished and installed will be measured and paid for at the Contract unit price per each for the type specified. The payment will be full compensation for the complete clearing and removal of debris and damaged unsalvageable parts, and for all material, labor, equipment, tools, and incidentals necessary to construct the temporary end treatment to the configuration specified.
When spare parts packages are furnished by the Administration, Repairing Temporary Traffic Barrier End Treatments will be measured and paid for at the Contract unit price per each for the type specified. The payment will be full compensation for pickup and all transportation, installation, reconnection to fixed objects where necessary, complete clearing and removal of debris and damaged unsalvageable parts, and for all material, labor, equipment, tools, and incidentals necessary to construct the temporary end treatment to the configuration specified.
Payment will not be made for spare parts packages used for end treatments damaged due to the Contractor’s operations.
(e) Removal of the temporary traffic barrier end treatments will not be measured but the cost will be incidental to the initial Contract unit price per each. Removal shall include patching of any holes made to anchor or stabilize the end treatment, and cleaning and clearing the area of all debris.

104.10 TEMPORARY CRASH CUSHION SAND FILLED PLASTIC BARRELS (SFPB)

104.10.01 DESCRIPTION
Furnish and install SFPB.
104.10.02 MATERIALS
Sand       901.01
Plastic Barrels (Yellow)       QPL
SFPB shall conform to NCHRP Report 350 and/or MASH 2016 criteria for Test Level 3.
104.10.03 CONSTRUCTION
Prior to installing the SFPB, level the ground supporting the system utilizing material comparable to the existing ground or as approved.
The components, assembly, placing configuration, and filling of the individual plastic barrels with varying weights of sand shall be in accordance with the manufacturer's recommendations or as specified in the Contract Documents. Barrels shall be watertight. SFPB may stand on pallets up to 4 in. high.
Reflectorize the first barrel of the SFPB configuration as specified. Following an impact, an approved reflectorized drum will suffice temporarily as reflectorization for the SFPB. Replace damaged barrels within four hours after notification.
Use dry and loose sand in the barrels. Do not use bags of sand. Add an antifreeze agent to the sand in accordance with the manufacturer's recommendations. Have sufficient replacement materials available.
Immediately after the SFPB have served the intended purpose, remove the installation and restore the site as directed.
104.10.04 MEASUREMENT AND PAYMENT
Temporary Crash Cushion Sand Filled Plastic Barrels will be measured and paid for at the Contract unit price per barrel for one or more of the items listed below and specified in the Contract Documents.
(a) Temporary Crash Cushion Sand Filled Plastic Barrels for Maintenance of Traffic.
(b) Replace Temporary Crash Cushion Sand Filled Plastic Barrels for Maintenance of Traffic.
(c) Remove and Reset Temporary Crash Cushion Sand Filled Plastic Barrels for Maintenance of Traffic.
The payment will be full compensation for excavation, regrading, and for all material, labor, equipment, tools, and incidentals necessary to complete the work.

104.11 TEMPORARY PAVEMENT MARKINGS

104.11.01 DESCRIPTION
Furnish, install, and remove temporary pavement markings as specified or as directed by the Engineer. Markings include lines, letters, numbers, arrows, and symbols.
104.11.02 MATERIALS
Pavement Marking Paint       951.01
Black Out Tape       951.02
Removable Pavement Markings       951.08
104.11.03 CONSTRUCTION
104.11.03.01 Quality Assurance/Quality Control. Refer to 549.03. Employ certified technicians to perform quality control testing. The Engineer will perform quality assurance checks by completing the Nighttime Visibility Evaluations per MSMT 729.
104.11.03.02 Warranty Period. Maintain and correct any defects in the pavement markings for a period of 180 days from the date of application for tape, thermoplastic or epoxy, and 60 days for paint. Replace defective pavement markings within this warranty period as necessary and as directed at no additional cost to the Administration. When paint is used as a temporary marking for a lane shift/closure that is to be greater than 60 days in length, it shall be reapplied every 60 days.
104.11.03.03 Application and Removal. Apply pavement markings per the manufacturer’s recommendations and as specified. Apply markings in the same direction as the flow of traffic. Apply the markings to the locations specified or as directed.
Pavement markings may be applied to either new or existing paved surfaces. Apply markings to newly paved surfaces before traffic is allowed on the pavement.
For milling and paving operations, non tape markings may be used for temporary markings between lifts and temporary raised pavement markings (RPM)s are not required. Use removable tape for temporary markings applied to the final surface.
When temperatures are too low to allow the placement of removable tape on the final surface, request a written exception for the use of other type of markings in lieu of removable tape.
Completely remove all non-applicable pavement markings within the travel way and adjacent to the travel way for lane shifts as necessary and as directed.
Surface Condition. Ensure the pavement surface is clean, dry, and free of all contaminants prior to applying any pavement markings. Remove all residual, loose or poorly applied pavement markings as necessary and as directed.
Pavement Marking Removal. Completely remove all removable pavement markings prior to applying permanent markings. Remove any objectionable adhesive residue on stage construction or final surfaces of Portland cement concrete pavements by water blasting or other methods as approved. Do not use open flame to remove any pavement markings or adhesive residue. Remove all pavement markings in a manner that ensures there is no damage to the existing or final surface.
Black out Tape. Black out tape may be used for masking existing markings in accordance with MdMUTCD. Use to mask existing marking for temporary shift conditions of less than 14 days and where the traffic will return to the original alignment and markings. For shifts longer than 14 days, remove the existing marking by hydro blasting and replace with new permanent /final markings when original alignment returns.
Retroreflectance. The initial retroreflectance readings for temporary pavement markings shall be a minimum of 250 and 150 millicandelas/lux/square meter for white and yellow markings, respectively. The pavement markings will be monitored per MSMT 729 during the Warranty Period.
104.11.04 MEASUREMENT AND PAYMENT
Payment for Removable Pavement Markings, Removal of Removable Pavement Markings, Pavement Marking Paint, and the Removal of Existing Pavement Markings will be measured and paid for using one or more of the items listed below and as specified.
Payment will be full compensation for furnishing, placing, complete removal of lines, letters, numbers, arrows, symbols, and the removal of all residue. Payment will also cover maintenance and replacement of the markings during the 180 day period, and for all material, labor, equipment, tools, and incidentals necessary to complete the work. Removal and replacement of temporary pavement markings required beyond the 180 day period will be measured and paid for at the Contract unit price for the pertinent temporary pavement marking item.
Temporary markings replaced during the 180 day period as a result of plowing will be paid for at the Contract unit price for the pertinent temporary marking item, as determined.
(a) Pavement Marking Paint-in width specified-per linear foot.
(b) Removable Pavement Line Markings-in width specified-per linear foot.
(c) Removable Letters, Symbols, Arrows, and Numbers per square foot.
(d) Removal of Removable Pavement Marking Lines-any width-per linear foot.
(e) Removal of Removable Letters, Symbols, Arrows and Numbers per each.
(f) Removal of Existing Pavement Line Markings-any width per linear foot.
(g) Removal of Existing Letters, Symbols, Arrows, and Numbers per square foot.
(h) Blackout Tape Lines-in width specified-per linear foot.
(i) Removal of Blackout Tape Lines-any width-per linear foot.

104.12 DRUMS FOR MAINTENANCE OF TRAFFIC

104.12.01 DESCRIPTION
Furnish, set, reset, maintain, and remove drums for maintenance of traffic.
104.12.02 MATERIALS
Reflectorization       950.03
Plastic Drums       QPL
Drums may be manufacturer-certified as NCHRP Report 350 and/or MASH 2016 compliant as long as there are no attachments to the device.
Drums shall be manufactured of low density polyethylene (LDPE), 36 in. in height, and have a diameter of at least 18 in. The drum shall have four, 6 in. wide horizontal, circumferential, alternating orange and white stripes, with the top stripe being orange. Drums may have one or more flat sides as long as the minimum 18 in. diameter is satisfied. Drums may include recycled plastic content. The drum base may contain up to 100 percent recycled content.
Use high performance wide angle white and fluorescent orange sheeting on all drums.
104.12.03 CONSTRUCTION
Use sand-filled bases or bags of sand to keep the drums from moving. Install sandbags on the base of the drum only. Rubber or plastic bases or recycled tires, weighing between 20 lb and 40 lb, may be used as a substitute for sandbags.
The Contractor’s name or identification mark may be neatly stenciled at the bottom of the nonreflective portion of the drum in letters no more than 2 in. high. No other markings or wording may be on the vertical side of the drum.
Maintain drums in a new or like new condition. Replace drums damaged by traffic within four hours after notification. Damaged drums shall be recycled to the extent possible. The disposition of the damaged drums shall be provided prior to payment for any replacement drums.
104.12.04 MEASUREMENT AND PAYMENT
Drums for Maintenance of Traffic will be measured and paid for once at the Contract unit price per each. The payment will be full compensation for all material, labor, equipment, tools, and incidentals necessary to complete the work.
Where drums have been set and damaged by traffic and the Engineer determines that they are not repairable, replacement will be measured and paid for at the Contract unit price. A disposition as specified in 104.12.03 is required prior to payment.

104.13 BARRICADES FOR MAINTENANCE OF TRAFFIC

104.13.01 DESCRIPTION
Furnish, set, reset, maintain, and remove barricades for maintenance of traffic.
104.13.02 MATERIALS
Reflectorization       950.03
Barricades       QPL
Barricades shall conform to NCHRP Report 350 and/or MASH 2016 criteria for Test Level 3.
104.13.03 CONSTRUCTION
Use barricade rails conforming to the MdMUTCD, with a minimum rail length of 5 ft. Use approved reflective sheeting and installation procedures.
Replace barricades damaged by traffic within four hours after notification.
Mount signs so that no more than half of the top two rails or one third of the barricade is covered. Mount signs on the barricade so that the bottom of the sign is at least 12 in. above the ground or surface. The bottom of rectangular signs shall not be mounted higher than the bottom of the top rail. Do not use aluminum signs.
104.13.04 MEASUREMENT AND PAYMENT
Barricades will be measured and paid for once at the Contract unit price per each for the pertinent barricade item specified in the Contract Documents. The payment will be full compensation for warning lights (when required), the maintenance and removal of any required warning lights, and for all material, labor, equipment, tools, and incidentals necessary to complete the work.
Where barricades have been set and damaged by traffic, and the Engineer determines that they are not repairable, replacement will be measured and paid for at the Contract unit price.

104.14 CONES FOR MAINTENANCE OF TRAFFIC

104.14.01 DESCRIPTION
Furnish, set, reset, maintain, and remove cones for maintenance of traffic.
104.14.02 MATERIALS
Reflectorization       950.03
Cones       QPL
Cones may be manufacturer-certified as NCHRP Report 350 and/or MASH 2016 compliant as long as there are no attachments to the device.
All cones shall meet MdMUTCD and be new or like new condition. All cones shall be orange in color. Cones shall be at least 28 in. high, 10 in. diameter at the inside of the base, and reflectorized with two white retroreflective stripes. The top stripe shall be 6 in. wide and located 3 in. to 4 in. from the top of the cone. The second stripe shall be 4 in. wide and located 2 in. below the top band.
Tall-Weighted Cones. When specified, tall-weighted cones shall be at least 42 in. high and 7 in. diameter at the inside of the base. Tall-weighted cones shall be manufactured of low density polyethylene (LDPE) and have four high performance wide angle white and orange retroreflective stripes. The stripes shall be horizontal, circumferential and 6 in. wide. Alternate stripe colors with the top stripe being orange. Any non-retroreflective spaces between the orange and white stripes shall not exceed 1/2 in.
104.14.03 CONSTRUCTION
The Contractor’s name or identification mark may be neatly stenciled at the bottom of the cone in maximum 2 in. high letters. Place no other markings or writings on the vertical area of the cone. Turn the cone so that Contractor’s name or identification mark faces away from traffic.
Equip all cones with approved weights or anchor collars, (15 lb maximum) as needed to maintain an upright position. Anchor collars shall fit to the base of the cone. For tall-weighted cones use anchor collars weighing 10 lb to 30 lb.
Replace cones damaged by traffic within four hours or as directed after being notified.
104.14.04 MEASUREMENT AND PAYMENT
Cones for maintenance of traffic and cones that have to be replaced will not be measured but the cost will be incidental to the Contract price for Maintenance of Traffic.

104.15 FLAGGER

104.15.01 DESCRIPTION
Furnish flaggers when specified or directed. Flaggers shall have completed an Administration approved flagger training course within the last four years. The failure of any flagger to perform the required duties will be grounds for replacement.
Flaggers shall utilize two-way radios, field telephones, or pilot vehicles when not within sight distance of each other, or when directed.
104.15.02 MATERIALS
Reflective sheeting on the STOP/SLOW paddle       950.03
Paddles shall be 24 in. x 24 in. with letters at least 8 in. high and mounted at least 5 ft above the ground.
104.15.03 CONSTRUCTION
Flagging shall conform to MdMUTCD. All outfits and equipment (STOP/SLOW paddles, pilot cars or other vehicles, air horns or bullhorns, field telephones, two-way radios, site illumination, etc.) will be subject to approval. Use STOP/SLOW paddles unless otherwise permitted.
104.15.04 MEASUREMENT AND PAYMENT
Flagger will not be measured but the cost will be incidental to the Contract price for Maintenance of Traffic.
When an item for Flagger is included in the Contract Documents, Flagger will be measured and paid for at the Contract unit price per hour. The payment will be full compensation for all material, labor, equipment, tools, and incidentals necessary to complete the work.

104.16 MODIFICATION OF EXISTING SIGNS

104.16.01 DESCRIPTION
Relocate, remove, cover, modify copy, reinstall, or change existing highway signs relating to the construction activity. This work is in addition to the temporary traffic signs specified in 104.08.
104.16.02 MATERIAL
Sign Panel Supports and Hardware       909.07, 921.05, 921.06, 950.04 A123, A153 and A709
Reflective and Non-reflective Sheeting       950.03
Sign Materials       950.08
Use an approved opaque sign covering material.
104.16.03 CONSTRUCTION
Modify existing signs as specified.
104.16.04 MEASUREMENT AND PAYMENT
Modification of Existing Signs will be measured and paid for using one or more of the items listed below and specified in the contract documents. The payment will be full compensation for all excavation, backfill, and for all material, labor, equipment, tools, and incidentals necessary to complete the work.
(a) Relocate Wood Sign Supports per each support.
(b) Sign Modifications to Overhead Sign Structures per square foot.
(c) Relocate Sign per square foot.
(d) Remove Sign per square foot.
(e) Modify Copy per each character.
(f) Install or Remove Shield per each.
(g) Cover Sign per square foot.
(h) Relocate Sign Luminaire per each.

104.17 TEMPORARY MOVABLE TYPE CONCRETE TRAFFIC BARRIER (MCTB)

104.17.01 DESCRIPTION
Furnish, place, assemble, maintain, move, and remove and dispose of movable interlocking type concrete traffic barrier. Movable barrier systems shall consist of individual units that remain connected for the total length when being moved in one continuous operation.
104.17.02 MATERIAL
Precast Movable Concrete Barrier and Transfer Device       QPL
Reflective Barrier Markers       QPL
MCTB shall conform to NCHRP Report 350 and/or MASH 2016 criteria for Test Level 3.
104.17.03 CONSTRUCTION
Perform all transfer shifts using the transfer device. The transfer device shall be capable of moving and transferring the barrier as required, and of operating on the curve and grades specified. Ensure that the device does not extend into traffic.
The Engineer will inspect the movable barrier upon delivery and throughout the life of the project. Replace any damaged or defective units as directed. Install reflective barrier markers as specified. Maintain the barrier and reflective barrier markers in a like new condition.
Perform all maintenance operations for the transfer device. Have sufficient spare parts and personnel available to ensure that the required lane configurations are in place at the required times. Failure to move the MCTB at the proper time will be cause for penalty under TC-4.02.
104.17.04 MEASUREMENT AND PAYMENT
The payment will be full compensation for all material, labor, equipment, tools, and incidentals necessary to complete the work.
(a) The initial installation of the Temporary Movable Type Concrete Traffic Barrier will be measured and paid for at the Contract unit price per linear foot measured in place from end to end.
(b) Transfer shifts of the barrier will be measured and paid for at the Contract unit price per linear foot for the Transfer Shift of Movable Type Concrete Barrier item. The measurement will be end to end of the barrier actually shifted. The Contract unit price will apply to each shift.
(c) Replacing sections of the barrier that have been damaged by vehicular traffic while in place will be measured and paid for at the Contract unit price per each for the Replacement Sections for Movable Type Concrete Barrier item. Replacement of sections damaged by the Contractor’s operations shall be at no additional cost to the Administration.
(d) Resetting the barrier will be measured and paid for at the Contract unit price per linear foot for the Reset Movable Type Concrete Barrier item. The payment will also include removal from its original placement and transporting and resetting it in its new temporary location.
(e) Reflective barrier markers will be measured and paid for as specified in 104.04.04(b).
(f) End treatments will be measured and paid for under the pertinent item specified in the Contract Documents.

104.18 TRAFFIC MANAGER (TM)

104.18.01 DESCRIPTION
Provide a Traffic Manager (TM).
104.18.02 MATERIALS
Not applicable.
104.18.03 CONSTRUCTION
Submit the TM’s name for approval at least 10 days prior to commencing any work on the project. Provide proof that the TM has completed an Administration approved Temporary Traffic Control training course within the last four years. A change in the appointment of any TM throughout the duration of the Contract will require a written submittal for approval. Any failure of the TM to perform the required duties will be grounds for replacement. The TM shall be available at all times and be on site within 1/2 hour during periods of active work in the work zone.
The TM shall do the following:
(a) Implement the Traffic Control Plan (TCP), maintain an up-to-date TCP, and provide a copy to the Engineer following any changes.
(b) Closely coordinate the operations with the Engineer and supervise the maintenance of traffic on the project, including those involving subcontractors.
(c) Make on-site inspections of the area affected by the work on a regular basis including Saturdays, Sundays, and holidays, and be available for consultation at all times. When the TCP is in place, make daily inspections during hours of operations and at least one night inspection per week. Perform additional inspections as directed.
(d) During holiday periods, in addition to the monitoring of the maintenance of traffic, conduct a surveillance of any area affected by the Contract work.
(e) Maintain a daily log of the inspections and include the date, time, hours worked, condition of maintenance of traffic, and any corrective action taken. Furnish a copy of the daily log to the Engineer by the following day.
(f) Provide coordination between adjacent work zone operations to ensure that inappropriate or conflicting messages or devices are not displayed to traffic.
(g) Immediately, notify the Engineer of any accident or incident within the area affected by the Contract.
(h) Make inspections during and immediately after adverse weather conditions to ensure that the traffic control devices are clean, undamaged, and in the correct position.
104.18.04 MEASUREMENT AND PAYMENT
The Traffic Manager will not be measured but the cost will be incidental to the Contract price for Maintenance of Traffic.

104.19 PORTABLE VARIABLE MESSAGE SIGNS (PVMS)

104.19.01 DESCRIPTION
Furnish, install and relocate portable, self-contained, trailer mounted variable message signs.
104.19.02 MATERIALS
PVMS       QPL
All materials shall be like new, corrosion resistant, and unaffected by water spray, salt, oil, gasoline, and all other contaminants in the quantities normally found along the edge of the traveled roadway. Construction, materials, and operation shall meet NFPA, UL, and NEC. Ensure that sign messages are visible and legible for a distance of 900 ft from any point along the traveled approach roadway at all times. The PVMS shall be equipped with a sighting device to provide alignment for maximum visibility.
104.19.03 CONSTRUCTION
104.19.03.01 Equipment
Trailer. In accordance with Maryland Motor Vehicle Law.
Structural Support. The structural support framework shall allow the system to be assembled into a unit and be mounted on the trailer and shall provide the support mechanism between the sign panel assembly, the power supply, and the controller.
The framework shall provide sufficient support to prevent damage to any unit component when the sign is in down and locked position during normal highway travel.
The deployed structure shall supply adequate support to allow complete sign operation, including raising and lowering of the sign panel, during sustained wind speeds of 85 mph.
The display windows shall be made of impact-resistant clear Lexan or as approved.
Sign Panel. Not to exceed 144 in. length, 90 in. height, 12 in. depth.
Display
(a) Capable of displaying three lines of text.
(b) Each line of text shall be constructed using either a discrete matrix or a full matrix display.
(c) Capable of displaying eight characters per line.
(d) The character height shall be at least 18 in.
(e) If discrete matrix display is used, each character shall be displayed using a 5 x 7 array with at least eight array modules per line.
A 4-1/4 in. to 7 in. space shall exist between each display line with no glare reflection.
(f) If full matrix display is used, the sign shall have at least 25 rows and 45 columns of disks. Each display line shall have at least 7 rows and 45 columns of disks and a 4-1/4 to 7 in. space between each display line with no glare reflection.
Flip Disk Mechanism
(a) Be electromagnetically activated, with a service life of at least 200 million operations.
(b) Have a reflective surface that will maintain color intensity for at least three years.
(c) Be circular or rectangular, with a visible surface area between 3-3/4 in2. and 4-1/4 in2.
LED Illumination. LED illumination for each matrix element shall:
(a) Meet ITE specification for amber color.
(b) Utilize AlInGaP substrate.
(c) Each LED shall produce at least a 1 candela output on center at 25 mA drive current.
(d) Each matrix element shall have at least two LED's located within the perimeter of the flipping disk.
(e) Provide full illumination within at least a 24 degree cone perpendicular to the sign face.
(f) Have an operating temperature range of -40 F to 160 F.
PVMS UNIT
Lift Mechanism
(a) Electric or electrically assisted hydraulic mechanism capable of raising and lowering the sign panel.
(b) Capable of being raised or lowered manually.
(c) Furnished with a stainless steel safety bolt to prevent the sign panel from lowering once in the raised position. A self-locking mechanism shall be incorporated into the safety bolt to prevent it from being inadvertently dislodged.
(d) Designed to allow the raised sign panel to rotate 360 degrees about the vertical axis.
(1) Allow rotation clockwise and counter-clockwise.
(2) A mechanism shall be provided to lock the sign panel in place, at any position.
Electrical Connections and Gauges
(a) All wiring from power sources to PVMS equipment shall use locking cable connectors.
(b) Volt and amp gauges shall be provided for both AC and DC.
(c) Standard negative ground system shall be tied to the sign chassis.
(d) Lightning protection shall be supplied to the load side of the sign system's distributed power lines to withstand multiple surges in excess of 600 volts.
Power Supply. Either a solar powered electrical system, or existing commercial electrical service.
Solar Powered Electrical System. Battery power system and solar array panels capable of displaying a two page message for 21 consecutive days without auxiliary charge.
Sign Controller
(a) Capable of driving the matrix display panel operating over a -50 F to 150 F range and in a 20 percent to 100 percent noncondensing humidity range.
(b) Accommodate 100 preprogrammed, user-defined messages.
(c) Capable of displaying three sequenced messages. On/Off time for each message in a sequence shall be user adjustable within a range of 0 to 5 seconds.
(d) Designed for fail-safe prevention of improper information display in the case of a system malfunction.
(e) Cause a user defined default message to be displayed in case of failure of the PVMS unit when flip disk mechanism is used.
(f) Have the capability of retrieving all messages stored in temporary memory.
(1) Temporary memory shall be nonvolatile.
(2) All messages and programs shall remain resident in the controller's memory in the event of a power failure.
(3) Have an RS-232 port to facilitate connection of an external communication device.
(g) Capable of automatic system recovery after power outages to the central controller without operator intervention, including the ability to maintain an up-to-date status on a remote unit if sign is operated from a remote location.
(h) Monitor and display the battery output voltage and solar array activities (charging/discharging), and blank the sign when the battery output voltage drops below the manufacturer's recommended output level.
(i) Capable of monitoring and displaying the status of the photocell and adjusting the sign illumination to match the ambient light conditions. The controller shall have at least nine levels of dimming from 10 percent to 100 percent brightness.
(j) Contained in a secure weatherproof cabinet located on the controller housing and insulated to protect against excessive vibration, temperature or tampering.
(1) Equipped with a lockable door latch and an interior cabinet dome light.
(2) Provided with a keyboard storage location inside the cabinet.
(3) Security locks shall include those installed by the manufacturer and an additional hardened hasp/lock combination with a user changeable combination. This hasp/lock setup shall be installed in a manner to maximize its effectiveness in stopping unauthorized access to the sign controls. For control box surfaces not compatible with the hasp/lock setup, other supplemental high security locking devices may be approved by the Engineer.
Security
(a) Lock all trailer control cabinets when not attended by Administration employee or contractors, whether being stored, in transport, or deployed and activated.
(b) Do not store or maintain any passwords on the PVMS.
(c) Remove any password attached or inscribed on the PVMS trailer or equipment.
(d) Change the password when it is no longer secure, or every 6 months, whichever comes first.
(e) Some older model PVMS may not have a changeable password, so extra measures shall be taken to hide the password.
(f) Do not leave Owner/Instruction manuals in the trailer control cabinets. Manuals should be copied and made available to the personnel responsible for deploying the PVMS Signs.
(g) When equipped with a detachable keyboard, remove it from the trailer and secure in the transport vehicle, field office, or at the respective shop.
(h) Failure to comply with these security standards or any subsequent PVMS tampering incidents will be cause for penalty under TC-4.02.
(i) Construction and District Inspectors will ensure contractor compliance.
Character Set Software
(a) Have all of the standard ASCII characters and symbols.
(b) Provide left and right arrows.
(c) Have all alphanumeric entries performed with a keyboard or keypad that causes the same character to be displayed on the matrix. Arrow symbols shall be generated via a cursor pad on the keyboard or keypad.
(d) Have messages default to self-centering display with the ability to left or right justify a display when full matrix is used.
104.19.03.02  Set up and operate the PVMS on the project site 24 hours in advance of actual use. Ensure that each unit is functioning properly and approved. Locate the PVMS as specified.
Aim the PVMS at approaching traffic in accordance with the 900 ft minimum visibility and legibility requirement. Ensure that the PVMS is level and that the sign face is not obscured by highway alignment or glare from either sunlight or vehicle headlights.
104.19.04 MEASUREMENT AND PAYMENT
Portable Variable Message Sign will be measured and paid for at the Contract price per unit day. A unit day will consist of any approved usage within a work shift, regardless of start time or whether the shift runs into another calendar day. Each portable variable message sign will be paid for only once per unit day, regardless of how many times it may be relocated. When a portable variable message sign is used for part of a day, it will be measured and paid for as a unit day. When operations require continuous 24-hour use of a portable variable message sign, the unit day will be measured as 24 hour periods from start to finish.
The payment will be full compensation for the electrical power and hook up, setup and maintenance of computer programs, changing messages, and for all material, labor, equipment, tools and incidentals necessary to complete the work.

104.20 TEMPORARY ORANGE CONSTRUCTION FENCE

104.20.01 DESCRIPTION
Furnish, install, and maintain new or like new temporary orange mesh construction fence. This fence is not to be used as a safety barrier.
104.20.02 MATERIALS
Precast Concrete Blocks       903.05
Tie Wire, Tension Wires, Tension Wire Clips and Hardware       914.02
Orange Mesh Fencing       As approved
Fence posts shall be 4 ft high, 1.90 in. diameter round posts; or 5-1/2 ft high, 2 in. steel U channel posts, as specified herein.
Submit samples of the fence fabric, fence posts, movable precast concrete blocks, tie wire, tension wires, and other miscellaneous hardware for approval.
104.20.03 CONSTRUCTION
Temporary orange construction fence shall be at least 4 ft high and with a maximum post spacing of 8 ft. When installed on a paved surface, support the fence by inserting the round post into a precast concrete block having a round hole through the center of the block. When installed in unpaved areas, use steel U channel fence posts driven 1-1/2 ft into the ground. Installation of the fence in any other manner will require approval.
Secure the fabric to the posts by wrapping a tie wire around the horizontal fence strands and the posts. Install a top tension wire to prevent sagging. When installed on paved surfaces, the Engineer will determine if a bottom tension wire is required.
Remove the fence when the Engineer determines that the fence is no longer required. The removed fence is the property of the Contractor.
Damaged Construction Fence. Repair or replace damaged construction fence within four hours after notification.
104.20.04 MEASUREMENT AND PAYMENT
The payment will be full compensation for all material, labor, equipment, tools, and incidentals necessary to complete the work.
Temporary Orange Construction Fence will be measured and paid for at the Contract unit price per linear foot for the actual number of linear feet measured to the centers of end posts.
Remove and Reset Temporary Orange Construction Fence will be measured and paid for at the Contract unit price per linear foot.

104.21 — RESERVED

104.22 STOP/SLOW AUTOMATED FLAGGER ASSISTANCE DEVICE (AFAD)

104.22.01 DESCRIPTION
An automated flagger assistance device (AFAD) system consists of two paired AFAD units of the same make and model that can be paired and operated by one or two certified flaggers. AFADs shall only be used in situations where there is only one lane of approaching traffic in the direction to be controlled.
Furnish, install, and maintain a portable, self-contained, trailer mounted STOP/SLOW AFAD for temporary traffic control as specified in the Contract Documents or as directed. Furnish certified flaggers to operate the AFADs. Flaggers operating the AFADs shall meet the requirements specified in 104.15.01. AFAD shall meet Sections 6E.04 and 6E.05 of the MdMUTCD.
104.22.02 MATERIALS
STOP/SLOW AFAD        QPL
The AFAD system shall have a conflict monitor system to prevent two units from simultaneously flashing the SLOW indication. Each AFAD shall be capable of being operated from the controller cabinet mounted on the unit. The unit shall have the ability for manual override in case of remote failure.
104.22.02.01 STOP/SLOW Sign. Each AFAD unit shall include a STOP/SLOW sign that alternately displays the STOP (R1-1) face and the SLOW (W20-8) face of a STOP/SLOW paddle. The STOP/SLOW sign shall have an octagonal shape and shall be fabricated of rigid material. The size of the STOP/SLOW sign shall be at least 30 in. x 30 in. with letters at least 8 in. high. The background of the STOP face shall be red with white letters and border. The SLOW face shall be diamond shaped with fluorescent orange background and black letters and border. Both faces of the STOP/SLOW sign shall be reflectorized as specified in 950.03. The bottom of the SLOW/STOP sign shall be mounted a minimum of 7 ft above the pavement. Maintain signs in a new or like new condition. When directed, replace signs that become faded, illegible, or damaged.
104.22.02.02 Stationary Signs. Each AFAD shall be supplemented by stationary sign(s) with one of the following options:
(a) Separate WAIT ON STOP (R1-7) and GO ON SLOW (R1-8) signs attached side by side below the STOP/SLOW sign. Each sign shall be 24 in. x 30 in. The background of the sign shall be white with black letters and border, and the sign face shall be reflectorized as specified in 950.03.
(b) One combined sign with combined message “WAIT ON STOP GO ON SLOW” attached below the STOP/SLOW sign. The sign shall be 36 in. x 36 in. The background of the sign shall be white with black letters and border, and the sign face shall be reflectorized as specified in 950.03.
The signs (‘WAIT ON STOP’, ‘GO ON SLOW’, or the combined ‘WAIT ON STOP GO ON SLOW’) shall be positioned on the same support structure as the AFAD such that they are in the same direct line of view of approaching traffic as the sign faces of the AFAD.
104.22.02.03 Conspicuity Devices. The AFAD shall be supplemented with active conspicuity devices. Each AFAD unit shall include a red Stop Beacon mounted a maximum of 24 in. above the STOP/SLOW face and yellow Warning Lights mounted to the side or above the STOP/SLOW face. The Stop Beacon shall consist of a 12 in. red LED signal head with visor and shall steadily illuminate in circular red only during the STOP sign display. The Warning Lights shall illuminate in flashing yellow during the SLOW sign display.
104.22.02.04 Gate Arm. The AFAD shall include a gate arm that descends to a horizontal position when the STOP sign is displayed and rises to vertical position when the SLOW sign is displayed. The length of the arm shall be at least 8 ft and the end of the arm shall reach at least to the center of the lane being controlled. The gate arm shall not extend in the opposite lane. The arm shall have alternating red and white retroreflective stripes on both sides sloping downward at 45 degrees toward the side on which traffic will pass. The arm shall be made of lightweight rigid material and be able to deflect and return to a functioning position after a vehicle strike. A retroreflective red or fluorescent retroreflective orange/red flag (minimum of 18 in. square) shall be attached on the end of the roadside end of the gate arm.
104.22.02.05 Trailer. Each unit shall include the trailer, structural support system, controller and ancillary equipment. The trailer shall be able to withstand wind velocities of 80 MPH and remain operational. The trailer shall be painted orange. The trailer shall comply with Maryland Motor Vehicle Law.
104.22.02.06 Remote Control. The AFAD shall be equipped with weatherproof handheld remote control that is capable of displaying the status of each sign. The Remote control shall be powered by rechargeable batteries. The remote control shall be programmable to control either one unit or two units and be able to control units over one-mile range.
104.22.02.07 Power Supply. The AFAD shall be able to operate from a solar powered electrical system and consist of battery power and solar array panels. The battery life shall sufficiently maintain the operation for the duration of the lane closure or have the ability to be recharged without deactivating the device.
104.22.03 CONSTRUCTION
104.22.03.01 AFAD. Place the AFAD trailer as shown in the Contract Documents or as directed, with all signs and traffic control devices visible to the driver of the initial approaching vehicle. Install advance warning signs and channelizing devices along the road center line and around the AFAD according to the Book of Standards and the Contract Documents.
The AFAD shall be like new, corrosion resistant, and unaffected by water spray, salt, oil, gasoline, and all other contaminants in the quantities normally found along the edge of the traveled roadway. Construction, materials, and operation shall be according to NFPA, ULI, and NEC.
When used at night, the AFAD location shall be adequately illuminated.
104.22.03.02 Transition between STOP and SLOW Conditions
(a) SLOW to STOP: The red Stop Beacon shall enter a “flashing mode” approximately two seconds before transitioning from the SLOW face to the STOP face. When the AFAD unit displays the STOP face, the red Stop Beacon shall illuminate in steady red, and the gate arm shall begin descent to the down position two seconds after the beacon has displayed the solid red light.
(b) STOP TO SLOW: The gate arm shall begin to ascend to the upright position as the face changes from STOP to SLOW and the red stop light shall cease to illuminate. The yellow beacon(s) shall enter flashing mode.
104.22.03.03 Flaggers. Provide certified flaggers on-site and use one of the following Methods to operate the AFAD(s):
(a) Method 1 – Place an AFAD at each end of the work area.
(b) Method 2 – Place an AFAD at one end and place a flagger at the opposite end.
The flagger operating the AFAD shall be able to view the device and the approaching traffic during operation.
104.22.03.04 Channelizing Devices. Install channelizing devices according to the MdMUTCD, the Book of Standards, the Contract Documents, and the following:
(a) Install a minimum of 11 channelizing devices spaced at 20 ft maximum along the center line on the approach to the AFAD.
(b) If the AFAD is not behind a barrier, use a minimum of 7 channelizing devices to form the shoulder taper to delineate the AFAD.
104.22.04 MEASUREMENT AND PAYMENT
104.22.04.01 Automated Flagger Assistance Device will be measured and paid for at the Contract price per unit day. A unit day will consist of any approved usage within a work shift, regardless of start time or whether the shift runs into another calendar day. Each Automated Flagger Assistance Device will be paid for only once per unit day, regardless of how many times it may be relocated. When an Automated Flagger Assistance Device is used for part of a day, it will be measured and paid for as a unit day. The payment will be full compensation for the Automated Flagger Assistance Device and for all material, labor, equipment, tools, and incidentals necessary to setup and operate the Automated Flagger Assistance Device at the site as required and at any relocated site as specified or as directed.
104.22.04.02 Certified flaggers to operate Automated Flagger Assistance Device will not be measured but the cost will be incidental to the Contract unit price for Automated Flagger Assistance Device.
104.22.04.03 Channelizing devices to delineate the center line in the approach to the Automated Flagger Assistance Device will not be measured but the cost will be incidental to the Contract unit price for Maintenance of Traffic.
104.22.04.04 Temporary traffic signs will be measured and paid for as specified in 104.08.

104.23 PROTECTION VEHICLE (PV)

104.23.01 DESCRIPTION
Furnish a PV as required.
The PV shall consist of a work vehicle with approved flashing lights as required by the standard TCP’s and either:
(a) A truck-mounted attenuator (TMA) with support structure designed for mounting the system to the work vehicle, or
(b) A trailer truck-mounted attenuator (TTMA) designed for attaching the system to the work vehicle by a pintle hook.
Provide an arrow panel (arrow mode for multilane roadways and caution mode on two-lane, two-way roadways) in accordance with 104.07.03. The arrow panel shall be integral to either the work vehicle or the TMA/TTMA.
No part of the TMA/TTMA shall be designed to intrude under the support vehicle during impact or require a safety clearance under the support vehicle that extends forward of the rear axle.
General. The ballast of the work vehicle shall meet the manufacturer’s specification for the TMA/TTMA and be firmly secured to prevent movement during an impact.
All exposed steel on the attenuator shall be primed and painted yellow. The undercarriage and support frame may be primed and painted black. All welding shall be performed by or under the direct supervision of a certified welder.
The rear facing surface of the TMA/TTMA shall have an inverted "V" chevron pattern formed by alternating 4 in. wide black and yellow stripes as shown in Standard No. MD 104.01-19C. The sides of the TMA/TTMA shall have a border of 4 in. red and white reflective tape as shown on Standard No. MD 104.01-18A.
The TMA/TTMA shall have a standard lighting system including brake lights, tail lights, turn signals, and ICC bar lights. All wiring shall be protected and adequately supported. The TTMA trailer shall conform to Maryland Motor Vehicle Law governing trailers.
Impact Performance. TMA/TTMAs manufactured prior to January 1, 2005 shall have passed NCHRP Report 350 Tests 50 and 51 Level 3. TMA/TTMAs manufactured after January 1, 2005 shall have passed NCHRP Report 350 Tests 50, 51, 52, and 53 Level 3.
Dimensions
(a) Road clearance for the TMA/TTMA shall be 12 ± 1 in. or as specified by the manufacturer.
(b) Total weight of the TMA, exclusive of the work vehicle, shall not exceed 2100 lb unless it is trailer-mounted.
Durability. The manufacturer shall ensure that travel vibration, in either a vertical (for TMA) or horizontal position, will not affect the performance of the work vehicle or the TMA/TTMA.
Certifications. Provide certification that the TMA/TTMA is in good working order, has not been damaged, conforms to the requirements of the manufacturer’s specifications (model number, roll ahead distance, truck weight, etc.), and includes the date of manufacture.
The manufacturer shall certify that moisture penetration will not impede the energy impact absorption properties or add significantly to the weight of the TMA/TTMA.
Tilting. An electrically powered tilt system shall be incorporated to facilitate the tilting of the TMA cartridge to a 90 degree position from horizontal. The unit shall have a locking device to secure the TMA system in the vertical position. The completed tilt system shall be factory assembled.
104.23.02 MATERIALS
The size of the work vehicle and the method of attachment shall be as specified in the TMA/TTMA manufacturer's specifications, and as tested according to NCHRP Report 350and/or MASH 2016 at Test Level 3. The gross vehicle weight rating (GVWR) of the work vehicle shall be a minimum of 14 000 lb, and any fuel tank or container of hazardous materials shall be at least 10 1/2 ft from the rear of the work vehicle.
104.23.03 CONSTRUCTION
Not applicable.
104.23.04 MEASUREMENT AND PAYMENT
Protection Vehicle will be measured and paid for at the Contract price per unit day. A unit day will consist of any approved usage within a work shift, regardless of start time or whether the shift runs into another calendar day. Each protection vehicle will be paid for only once per unit day, regardless of how many times it may be relocated. When a protection vehicle is used for part of a day, it will be measured and paid for as a unit day. When operations require continuous 24-hour use of a protection vehicle, the unit day will be measured as 24 hour periods from start to finish.
The payment will be full compensation for the complete protection vehicle, including the truck mounted attenuator/trailer truck mounted attenuator and arrow panel, licensed work vehicle operator, unless a separate pay item has been established for the Operator, relocating the protection vehicle, and for all material, labor, equipment, tools, and incidentals necessary to complete the work.

104.26 REMOVABLE RUMBLE STRIPS

104.26.01 DESCRIPTION
Furnish, install, maintain, and remove removable rumble strips.
104.26.02 MATERIALS
Removable Rumble Strips       QPL
Rumble strips shall be white in color, 4 in. wide, and 0.250 in. thick.
104.26.03 CONSTRUCTION
104.26.03.01 Quality Assurance/Quality Control. Perform quality control testing using technicians certified by the Administration.
104.26.03.02 Warranty Period. Maintain the rumble strips and repair defects for a period of 180 days from the date of application. Replace as necessary within this period as directed at no additional cost to the Administration. Refer to GP-5.11.
At least 90 percent of the total number of rumble strips in any lane shall be free from signs of failure due to blistering, excessive cracking, discoloration, smearing or spreading under heat, chipping, spalling, or poor adhesion to the pavement. Replace rumble strips showing wear or a thickness less than 0.20 in.
104.26.03.03 Application and Removal. The pavement surfaces shall be completely dry and free of oil, grease, sand, dirt, dust, loose aggregate, soil, salt, and other contaminants. Apply the rumble strips in accordance with the manufacturer’s recommendations and the Contract Documents. Place perpendicular to the flow of traffic and located as specified.
Space the strips between 4 ft and 10 ft on center, with a pattern of at least 10 but not more than 12 strips per set. Decrease the spacing within each set as motorists approach the work zone. The spacing between the sets shall be as specified.
Do not place on sharp horizontal or vertical curves. Use in conjunction with other traffic control devices or visual cues that will assist drivers in identifying the appropriate action to take.
For installations where the roadway is wider than one lane in each direction, install in one-lane width segments utilizing butt joints. Do not overlap. Continue at least 1 ft onto each shoulder. Do not install over pavement seams, joints, or deteriorating markings and substrates.
When no longer required, remove rumble strips and residue. Return the pavement surface to its original condition.
104.26.04 MEASUREMENT AND PAYMENT
Removable Rumble Strips will be measured and paid for at the Contract unit price per linear foot. The payment will be full compensation for all material, labor, equipment, tools, and incidentals necessary to complete the work.
Removal and replacement required beyond the 180 day period will be measured and paid for at the Contract unit price for the Removable Rumble Strip item.
Replacements made during the service life due to plowing will be paid for at the Contract unit price for the Removable Rumble Strip item.
104.26.04.01 Removal, Replacement, and Corrective Actions. Any additional cost, including maintenance of traffic, for the removal of rumble strips that are installed inaccurately or incorrectly shall be at no additional cost to the Administration. In addition, the current road user fee will be applied when traffic disruption occurs during corrective actions.

104.27 TEMPORARY PORTABLE RUMBLE STRIPS (TPRS)

104.27.01 DESCRIPTION
Furnish, install, maintain, adjust, and remove temporary portable rumble strips (TPRS). Work shall consist of preparing the road surface, installing, maintaining, adjusting, and removing temporary rumble strips in construction work zones at the locations shown in the Contract Documents or as directed.
104.27.02 MATERIALS
Temporary Portable Removable Rumble Strips        QPL
104.27.02.01 TPRS shall consist of thermoset cast urethane, engineered polymers, or rubber materials. TPRS shall not curl or deform across the width of the strip, maintaining its rigidity. The face of the strips shall be a non-slip textured surface. Each strip shall be capable of being installed without adhesives or bolts.
104.27.02.02 TPRS shall consist of a single segment or be comprised of interlocking sections. The color of the TPRS shall be white, orange, or black. Each TPRS segment shall be 3/4 in. to 1 in. thick, 10 ft to 12 ft long, and 8 in. to 15 in. wide. TPRS shall be deemed safe by the manufacturer for use by motorcycles and able to withstand tractor trailer traffic with minimal movement.
104.27.03 CONSTRUCTION
104.27.03.01 Installation, Monitoring, and Removal. Select the appropriate TPRS from the QPL for the posted speed limit of the roadway. Provide a copy of the manufacturer’s installation guidelines to the Engineer. Install and remove according to the manufacturer’s recommendations and the Contract Documents. Verify placement with the Engineer prior to installation. Each segment shall be uniform in color throughout the work zone.
104.27.03.02 Installation. Do not use TPRS on loose gravel, bleeding asphalt, heavily rutted pavements, milled or unpaved surfaces. Do not place TPRS through pedestrian crossings and railroad crossings. Do not use TPRS in rain, snow, or icy weather conditions. Do not extend TPRS onto the shoulder without the approval of the Engineer. Do not place TPRS on sharp horizontal or vertical curves; instead, install TPRS in advance of the curve so they are visible to approaching traffic.
Clean the roadway to remove dust, sand, and other debris. Arrange the strips in an array consisting of three complete strips per lane spaced and configured according to the manufacturer’s recommendations and the Book of Standards. The length of each strip, whether comprised of one segment or interlocking segments, should be within 12 in. of the full lane width. Center TPRS in the lane.
104.27.03.03 Monitoring. Monitor, maintain alignment, and repair the TPRS if needed. Ensure that the rumble strips are perpendicular to the lane and that the correct spacing between rumble strips is maintained at all times. Correct the positioning of the rumble strips if any strip moves by more than 1 ft in any direction during the work period. If any strip comes out of alignment, clean the strip on both sides, and reset the strip onto a clean roadway surface.
104.27.03.04 Removal. Remove TPRS from the roadway when lane restrictions are removed or as directed. After removing the TPRS, clean and restore pavement to normal condition.
104.27.04 MEASUREMENT AND PAYMENT
The payment will be full compensation for all material, labor, equipment, tools, and incidentals necessary to complete the work.
104.17.04.01. The initial installation of Temporary Portable Rumble Strips will be measured and paid for at the Contract unit price per each array per unit day. A unit day will consist of any approved usage within a 24-hour calendar day period. When a temporary portable rumble strip array is used for part of a day, it will be measured and paid for as a unit day. An array consists of three complete temporary portable rumble strips spanning a single lane. Payment will be full compensation for cleaning the roadway surface, installing the rumble strip, and maintaining the strip through the duration of each day’s use, including cleaning and resetting of the strip if it comes out of alignment.
104.17.04.02. Remove and Relocate Temporary Portable Rumble Strips will be paid for at the Contract unit price per each array. The payment includes removal of the temporary portable rumble strip array, relocating the array to a new location, cleaning the roadway surface, installing the rumble strips, and maintaining the strips through the duration of each day’s use, including cleaning and resetting the strip if it comes out of alignment.
104.17.04.03. Removal of the temporary portable rumble strips at the end of each workday and final removal will be incidental to the item Temporary Portable Rumble Strips, including cleaning and restoring the pavement to normal conditions.

104.28 SPEED DISPLAY TRAILER (SDT)

104.28.01 DESCRIPTION
Furnish, install and relocate a portable, self-contained, trailer mounted, dynamic speed display with static speed limit sign.
104.28.02 MATERIALS
Speed Display Trailer       QPL
Each unit shall include the trailer, structural support system, sign panel assembly, lift mechanism, power supplies, sign mounted controller, non-invasive speed detection device, and ancillary equipment.
All materials for the SDT shall be like new, corrosion resistant, and unaffected by water spray, salt, oil, gasoline, and all other contaminants in the quantities normally found along the edge of the traveled roadway. Construction, materials, and operation shall be in accordance with NFPA, ULI, and NEC. Sign messages shall be visible for a distance of 0.5 mile and legible for a distance of 900 ft from any point along the traveled approach roadway at all times.
104.28.02.01 Equipment
Trailer. In accordance with Maryland Motor Vehicle Law governing trailers.
Structural Support. Refer to 104.19
Sign Panel. Sign panel dimensions shall not exceed 48 in. wide by 60 in. high.
Display
(a) Each line of text shall be constructed using either a full or discrete matrix display.
(b) The character height shall be at least 16 in.
(c) If discrete matrix display is used, each character shall be displayed using a 5 x 7 array with at least two array modules per line.
(d) If a full matrix display is used, the sign shall have a pixel arrangement of at least 5 rows by 7 columns with 3 LEDs per pixel.
(e) Attach one R2-1 (48 in. x 60 in.) Speed Limit sign to the trailer. The sign shall be easily removed and replaced.
LED Illumination. LED illumination for each matrix element shall have the following characteristics:
(a) LED shall conform to the ITE specification for amber color for warning applications.
(b) Each LED shall produce at least 1 candela output on center at operating drive current.
(c) LED shall provide full illumination within at least a 24 degree cone perpendicular to the sign face.
(d) Operating temperature range of the LED shall be -30 F to 125 F.
SDT Unit. Submit a catalog cut and character set for any SDT approval to the Office of Traffic and Safety, Chief of Traffic Operations.
Lift Mechanism
(a) The lift mechanism shall be installed such that the sign panel can be raised and lowered manually.
(b) A stainless steel safety bolt shall be provided to prevent the sign panel from lowering once in the raised position. A self-locking mechanism shall be incorporated into the safety bolt to prevent it from being inadvertently dislodged.
Electrical Connections and Gauges
(a) All wiring from power sources to SDT equipment shall use locking cable connectors.
(b) Volt and amp gauges shall be provided for both AC and DC.
(c) Standard negative ground system shall be tied to the sign chassis.
Power Supply. The SDT shall operate from a solar powered electrical system. This system shall consist of battery power system and solar array panels, and be capable of displaying and storing vehicle speeds for 21 consecutive days without an auxiliary charge.
Sign Controller. The controller shall:
(a) Be capable of driving the matrix display panel operating over a -30 F to 125 F range and in a 20 percent to 95 percent noncondensing humidity range.
(b) Be designed for fail-safe prevention of improper information display in the case of a system malfunction.
(c) Monitor and display the battery output voltage and solar array activities (charging and discharging). The controller shall blank the sign when the battery output voltage drops below the manufacturer’s recommended output level.
(d) Be capable of monitoring and displaying the status of the photocell and adjusting the sign illumination to match the ambient light conditions. The controller shall have at least nine levels of dimming from 10 percent to 100 percent brightness.
(e) Be contained in a sheet metal or high density polyethylene (HDPE), weatherproof cabinet located on the controller housing, and insulated to protect against excessive vibration and temperature.
The cabinet shall have a lockable door latch and interior cabinet dome light.
(f) Be capable of storing vehicle speed readings with a time and date stamp and have sufficient memory to store 100 000 readings.
(g) Be capable of having remote access to modify sign messages, speed thresholds, and download vehicle speed readings.
Speed Display Software
(a) The SDT shall be supplied with a non-invasive speed detection unit. The unit shall be able to be rotated on a separate vertical axis from the SDT to allow for better aiming and detection. The unit shall detect and display the speed of only approaching traffic.
(b) The speed display software shall be able to display vehicle speeds that are traveling over a set threshold. The SDT shall also be capable of not displaying a vehicle speed over a separate set threshold.
The speed display software shall have the capability of modifying speed thresholds.
104.28.03 CONSTRUCTION
Set up and operate the SDT on the project site 24 hours in advance of actual use to ensure that each unit is functioning properly and approved.
Aim the SDT at approaching traffic that is at least 900 ft in advance of the SDT and in accordance with the 0.5 mile minimum visibility and 900 ft minimum legibility requirement. Ensure that the SDT is level and that the sign face is not obscured by highway alignment or glare from either sunlight or vehicle headlights.
104.28.04 MEASUREMENT AND PAYMENT
The Speed Display Trailer will be measured and paid for at the Contract price per unit day. A unit day shall consist of any approved usage within a 24 hour calendar day period. Each Speed Display Trailer will be paid for only once per unit day, regardless of how many times it is relocated. When a unit is used for part of a day, it will be measured as a unit day.
The payment will be full compensation for the setup and maintenance of computer programs, changing messages, and for all material, labor, equipment, tools, and incidentals necessary to complete the work.

104.29 TRUCK MOUNTED VARIABLE MESSAGE SIGN (TVMS)

104.29.01 DESCRIPTION
Furnish, install and relocate a portable, self-contained, truck mounted, variable message sign.
104.29.02 MATERIALS
Each unit shall contain the work vehicle structural support system, sign panel assembly, lift mechanism, power supplies, sign mounted controller, and ancillary equipment.
All materials for TVMS shall be like new, corrosion resistant, and unaffected by water spray, salt, oil, gasoline, and all other contaminants in the quantities normally found along the edge of the traveled roadway. The TVMS construction, materials, and operation shall meet NFPA, UL, and NEC. Ensure that sign messages are visible and legible for a distance of 900 ft from any point along the traveled approach roadway at all times.
The TVMS shall not block the driver’s rear view vision when either in the transport or the deployed position.
104.29.03 CONSTRUCTION
104.29.03.01 Equipment
Truck. The work vehicle size and the method of attachment shall be as specified in the manufacturer's specifications. All vehicles shall be in accordance with Maryland Motor Vehicle Law.
Structural Support. The structural support framework shall allow the system to be assembled into a unit and be mounted on the truck, and shall provide the support mechanism between the sign panel assembly, the power supply, and the controller.
The framework shall provide sufficient support to prevent damage to any TVMS components when the sign is in the down and locked position during normal highway travel.
The sign panel shall be mounted as a permanent fixture of the truck and provide a minimum height of 7 ft from the bottom of the sign to the surface of the roadway when in its operating position. Affixing a trailer mounted unit to a truck is prohibited.
The deployed structure shall supply adequate support to allow complete sign operation including raising and lowering of the sign panel during sustained wind speeds of 85 mph.
The display windows shall be made of impact-resistant clear Lexan or as approved.
Sign Panel. Sign panel dimensions shall not exceed 92 in. wide by 54 in. high unless approved. The TVMS shall be capable of displaying three lines of text with the following requirements:
(a) Each line of text shall be constructed using a full matrix display.
(b) The sign shall be capable of displaying six characters per line.
(c) The character height shall be at least 12 in.
(d) The sign shall have a pixel arrangement of at least 20 rows by 40 columns, with at least 3 LEDs per pixel.
LED Illumination. LED illumination for each matrix element shall have the following characteristics:
(a) LED shall meet to the ITE specification for amber color.
(b) LED shall utilize A1InGap substrate.
(c) Each LED shall produce at least one candela output on center at 25 mA drive current.
(d) LED shall provide full illumination within at least a 24 degree cone perpendicular to the sign face.
(e) Operating temperature range of the LED shall be -30 F to 125 F.
TVMS Unit. Submit a catalog cut and character set for any TVMS approval to the Office of Traffic and Safety, Chief of Traffic Operations. Furnish examples of standard messages to be used on the sign.
Lift Mechanism
(a) The lift mechanism shall be capable of being raised and lowered manually.
(b) A self-locking mechanism shall be provided to prevent the sign panel from lowering once in the raised position.
Electrical Connections and Gauges
(a) All wiring from power sources to TVMS equipment shall use locking cable connectors.
(b) Each sign shall be equipped with an automatic lamp intensity regulator that maintains a constant output with a varying battery voltage.
(c) Standard negative ground system shall be tied to the vehicle chassis.
Power Supply. The TVMS shall operate from a solar powered electrical system.
Sign Controller. The controller shall:
(a) Be capable of driving the matrix display panel operating over a -30 F to 125 F range and in a 20 percent to 95 percent noncondensing humidity range.
(b) Accommodate 50 preprogrammed, user-defined messages.
(c) Be capable of displaying three sequenced messages. On/Off time for each message in a sequence shall be user adjustable at one-tenth of a second increments within a range of 0 second to 5 seconds.
(d) Be designed for fail-safe prevention of improper information display in the case of a system malfunction. In the event of a system malfunction, the sign shall display a blank message.
(e) Have the capability of retrieving all messages stored in temporary memory.
(1) Temporary memory shall be nonvolatile.
(2) All messages and programs shall remain resident in the controller’s memory in the event of a power failure.
(3) Have an RS-232 port to facilitate connection of an external communication device.
(f) Monitor and display the battery output voltage and solar array activities (charging and discharging) and blank the sign when the battery output voltage drops below the manufacturer’s recommended output level.
(g) Be capable of monitoring and displaying the status of the photocell, adjust the sign illumination to match the ambient light conditions, and have at least nine levels of dimming from 10 percent to 100 percent brightness.
(h) Be contained in a sheet metal or high density polyethylene (HDPE), weatherproof cabinet located on the controller housing, and insulated to protect against excessive vibration and temperature.
(1) The cabinet shall have a lockable door latch.
(2) The keyboard/input device storage location shall be provided inside the cabinet.
Character Set Software. The character set software shall:
(a) Have all the standard ASCII characters and symbols.
(b) Provide left and right arrows.
(c) Have all alphanumeric entries performed with a keyboard or keypad that causes the same character to be displayed on the matrix. Arrow symbols shall be generated via a cursor pad on the keyboard or keypad.
(d) Have messages default to self-centering display with the ability to left or right justify.
104.29.03.02 Operation. Set up and operate the TVMS 24 hours in advance of actual use to ensure that each unit is functioning properly and approved.
Variable Message Sign Mode. Use the TVMS in variable message sign mode on roadways where the posted speed limit is less than or equal to 40 mph. The TVMS is intended for mobile operations. If used for stationary construction or maintenance operations, do not leave the TVMS in place for more than eight consecutive hours.
Arrow Panel Mode. The TVMS may be used in lieu of a Type C arrow panel on any roadway as long as the TVMS is capable of displaying a left arrow, right arrow, double arrow, and a four-corner caution mode.
Use the TVMS only as a supplement to other required traffic control devices. When closing a through travel lane on a multilane roadway, use the “Arrow” mode only. Only one TVMS in the “Arrow” mode shall be used for each stationary lane closure. Moving work operations may utilize one or more TVMS for a single lane closure.
(a) Ensure that the placement does not cause driver confusion near ramps, median crossovers, and side road intersections.
(b) For stationary lane closures, place the TVMS on the shoulder at the beginning of the taper (nearest to oncoming traffic). Where there are narrow or no existing shoulders in the closed lane behind the channelizing devices, place the TVMS as near to the beginning of the taper as possible.
(c) For moving maintenance type activities along multilane highways where a lane is closed, place the TVMS at the rear of the activity in the closed lane on a vehicle separate from the maintenance vehicle itself. For paint striping activities, additional vehicles with TVMS or arrow panels in the arrow mode may be required to supplement the work operation. TVMS shall always remain upstream of the maintenance vehicles where adequate recognition distance is available. The vehicle carrying the TVMS shall be equipped with signing and lighting as required by the standard TCPs.
(d) TVMS shall only display the “Caution” mode for a lane closure on a two-lane, two-way roadway, or for a shoulder closure on any roadway. The “Caution” mode on a TVMS shall show displays of circular appearance in each of the four corners of the TVMS. The circle diameters shall range from 9.5 in. to 11 in. and utilize approximately 30 pixels. The circles shall be offset from the left and right edge between 3 in. and 6 in. and from the top and bottom edge between 1.5 in. and 3 in. The vertical spacing between the centers of the circles shall range from 2.5 to 3 times the diameter of the circles. The horizontal spacing between the centers of the circles shall range from 1.75 to 2 times the vertical spacing.
Install the TVMS as specified.
The TVMS shall be designed so that it supplies a minimum visibility and legibility distance of 900 ft. Ensure that the TVMS is level and that the sign face is not obscured by highway alignment or glare from either sunlight or vehicle headlights.
104.29.04 MEASUREMENT AND PAYMENT
Truck Mounted Variable Message Sign will be measured and paid for at the Contract price per unit day. A unit day will consist of any approved usage within a work shift, regardless of start time or whether the shift runs into another calendar day. Each truck mounted variable message sign will be paid for only once per unit day, regardless of how many times it may be relocated. When a truck mounted variable message sign is used for part of a day, it will be measured and paid for as a unit day. When operations require continuous 24-hour use of a truck mounted variable message sign, the unit day will be measured as 24 hour periods from start to finish.
The payment will be full compensation for the vehicle, setup and maintenance of computer programs, changing messages, and for all material, labor, equipment, tools, and incidentals necessary to complete the work.

104.30 PORTABLE TRAFFIC SIGNAL (PTS)

104.30.01 DESCRIPTION
Furnish, install, and maintain a portable, self-contained, trailer mounted traffic signal for maintenance of traffic operations as specified in the Contract Documents or as directed by the Engineer.
104.30.02 MATERIALS
Portable Traffic Signal (PTS)        As Approved by Office of Traffic and Safety
104.30.03 CONSTRUCTION
Place PTS trailers in the closed lane during alternating one-lane, two-way traffic operations, without intruding into the travel lane, or as directed by the Engineer.
The Contractor is responsible for all setup procedures necessary for the PTS including setting up the trailers, setting up and testing the remote monitoring system notification, aiming signal heads, interconnecting the signal controllers, aiming, and adjusting vehicle detection units, and installing the timing provided by the Office of Traffic & Safety.
104.30.03.01 Equipment
Each PTS shall be a trailer mounted unit. A PTS system shall consist of two or more trailers. Each unit shall be self-contained battery powered with solar assist, consist of two signal heads per trailer, and a solid state signal controller. One signal head should be mounted on an overhead mast arm capable of extending over the travel lane. The other signal head shall be mounted on a vertical upright. The PTS system shall have non-intrusive vehicle detectors and each PTS must be interconnected to each other at all times with a twisted pair shielded cable or wireless radio link with sufficient range, as specified in the Contract Documents or as directed.
Trailer. The trailer shall conform to Maryland Motor Vehicle Law governing trailers.
Support Structure. The PTS trailer shall be capable of accommodating a vertical upright and a horizontal mast arm. The trailer and all mounted equipment shall be structurally adequate for unlimited, normal operation in wind velocities typically encountered on the roadway (gusts of 80 MPH). No additional ballast shall be used to achieve the structural stability required for normal operation. Additional ballast includes but is not limited to, sandbags, concrete/cement blocks and steel, cast, or iron weights (secured or unsecured). PTS trailers shall be manufactured to accommodate the option of transporting two signal trailers with one vehicle. Each signal trailer shall be equipped with four stabilizing/leveling jacks, one on each corner of the trailer. The PTS trailer shall have adequate structural integrity to facilitate lifting and placing the PTS trailer as required.
Lift Mechanism. The PTS shall contain a lift mechanism that is electric or electrically-assisted hydraulic, as well as a manual mechanism capable of raising and lowering the mast arm. The mast arm shall extend a minimum of 9 ft from the side of the trailer.
Signal Heads/Display Requirements. The PTS shall meet the physical display and operational requirements of conventional traffic signals according to Part IV of the MdMUTCD. Signal Heads shall be cast aluminum and have three, 12 in. LED indications, conforming to ITE Specifications for “Vehicle Traffic Control Signal Heads” and NEMA Standards TS1 and TS2. Signal heads shall be equipped with visors which extend beyond the signal head a minimum of 10 in. All signal housings shall have a black face and yellow housing. The signal heads shall have the ability to accommodate back plates and rotate horizontally 180 F. The PTS shall have a reversible signal head mounting feature which will allow two trailers to be placed in the same lane of traffic. Both signal heads shall be able to be rotated and locked into position to provide the optimum visibility to motorists. The overhead signal shall have a minimum clearance height of 17 ft and a maximum clearance height of 19 ft, measured from the bottom of the green indication to the road surface. The lower signal head shall be mounted to a vertical upright at a minimum height of 8 ft measured from the bottom of the green indication to the road surface.
Power Requirements. Each PTS Trailer shall be equipped with batteries sufficient to operate the signal for a minimum of 21 days at 72 F without charging. The charging system shall include 390 watts (minimum) of solar collection capability and an onboard battery charger capable of being used with a 110 volt power source. The system shall also include an onboard monitoring system capable of regulating and providing a visual display of the battery voltage and solar input.
Operational Requirements. Each PTS shall be equipped with an operating system having the following capabilities:
(a) The signal controller shall be enclosed in a cabinet mounted on each trailer.
(b) The controller shall be furnished with a keypad or LCD display screen to allow for the signal operator to program the signal under all weather conditions. The controller shall have the capability of connecting to a PC or laptop for programming.
(c) The signal controller shall operate between -30 F and 150 F and in a 20 percent to 100 percent humidity range.
(d) A conflict monitoring system conforming to NEMA Standards shall be provided.
(e) The PTS shall have the capability of being operated in a fixed time, traffic actuated or manual control mode.
(f) Fixed time mode operation option must include the ability to provide a minimum of five automatic signal timing changes within a 24-hour period.
(g) The operating system shall have the ability to control a minimum of 7 traffic phases.
(h) Programmable green times from 3 seconds to 250 seconds, yellow times from 3.5 seconds to 6 seconds, and red times from 1 second to 250 seconds shall be provided. All programmable green times shall be in 1 second increments. All programmable clearance times shall be in 0.5 second increments.
(i) The PTS shall have the ability to facilitate minimum / maximum green time programming in the traffic actuated mode in a manner that will extend the green times in predetermined programmable segments as required.
(j) The operating system shall have a programmable time-of-day feature that will allow the maximum green times to be changeable by time of day.
(k) The operating system shall have the capability of facilitating standby modes of red, red flash and yellow flash mode.
(l) The operating system shall be capable of facilitating traffic actuation with true presence capability.
(m) The operating system shall have an integrated mechanism capable of recording system malfunctions including date and time of system failure. This information shall be available in a printable format.
(n) The operating system shall be capable of accommodating a pre-emption system with optical activation which provides a priority green phase in the direction of appropriately equipped approaching emergency vehicles.
(o) The operating system shall have the capability to allow the PTS to be connected to and controlled by a standard NEMA controller.
(p) The operating system shall have a manual control option that will allow the Traffic Manager to manually control the signal to coordinate the PTS system for special operations.
(q) The operating system shall be equipped with diagnostic capabilities in the event of a system default.
(r) The system shall have the capability of identifying the default in a manner that will expedite the return to full operational mode.
Monitoring System Requirement. Furnish and install PTS monitoring system capable of reporting signal location, battery voltage and system default. The monitoring system shall have the ability to communicate system default via text or email to responsible individuals. As specified in GP-2.04 Site Investigation verify available communications at the site, e.g., cellular or satellite, and select an appropriate PTS monitoring system that works with that communication method. Coordinate the installation of monitoring system with the ADE-T to develop an acceptable plan for monitoring signal operations and reporting on system default.
Actuation Requirements. The PTS systems shall be capable of utilizing non-invasive detectors for traffic actuation. Acceptable non-invasive detectors include microwave motion sensors and video detection cameras. Acceptable PTS systems shall have the capability of being operated with both a motion and true presence actuation system.
Communication Requirements. The PTS systems shall have the capability of being operated using hardwired or wireless communication. Field conditions will determine the method used for interconnection of the PTS system. The communication cable shall be deployed in a manner that will not intrude in the direct work area of the project or obstruct vehicular and pedestrian traffic. If a radio link communication option is utilized, a clear line of sight must be maintained between PTS units. The radio system shall conform to the applicable Federal Communication Commission requirements and all applicable state and local requirements. Should there be a failure in the communication link between the two signals, both signals shall be display solid red indications.
Default Requirements. PTS systems shall have the capability of reverting to a solid red, red flash, or yellow flash mode upon system default. The default setting shall be solid red unless otherwise stated in the project specifications or as directed by the Engineer. Upon default the PTS system shall immediately contact a minimum of three responsible individuals via the remote monitoring system described in the Operational Requirement section. The PTS system repairs shall be the responsibility of the contactor and rendered in a manner that will return to PTS to full operation condition in the most expeditious manner.
Field Operations. Set up, program, relocate, and maintain the PTS as per the Contract Documents or as directed by the Engineer, as recommended by the PTS manufacturer. Notify the Assistant District Engineer Traffic and the Office of Traffic and Safety at least three weeks prior to starting work. There will be no programming or timing changes to the PTS without written approval from the Office of Traffic and Safety.
The contractor shall adjust or reconfigure the PTS operation only as directed by the Engineer, with approval from the Office of Traffic and Safety and the Assistant District Engineer Traffic.
Operate the PTS as noted on the Maintenance of Traffic signalization plans, when available.
Provide MDOT SHA with the name and telephone number of an emergency contact person to maintain and operate or repair the signals. Make provisions to have certified flaggers who have completed the MDOT SHA approved flagger training course and make provisions to have appropriate signing in place to maintain traffic at the PTS location in case of a PTS failure. Notify the Engineer, the Statewide Operations Center (SOC), and the ADE-T in the event of a failure. Maintain daily log at the signal site and record equipment malfunction.
104.30.04 MEASUREMENT AND PAYMENT
The Portable Traffic Signal will be measured and paid for at the Contract price per unit day. A unit day will consist of any approved usage within a normal work shift, regardless of start time or whether the shift runs into another calendar day. Each portable traffic signal will be paid for only once per unit day. When a portable traffic signal is used for part of a day, it will be measured and paid for as a unit day. When operations require continuous 24-hour use of a portable traffic signal, the unit day will be measured as 24 hour periods from start to finish.
The payment will be full compensation for the provision, installation, operation, interconnection, monitoring system, maintenance, reconfiguration, adjustments, flaggers, signing, repair technicians, relocation as required by the Traffic Control Plan or as directed by the Engineer, and for all materials, labor, equipment, tools, training by the portable traffic signal manufacturer, and incidentals necessary to complete the work. Where other Contract pay items for Maintenance of Traffic are specified in the Contract Documents, measurement and payment shall conform to the pertinent items.

104.31 ACCESSIBLE PEDESTRIAN MAINTENANCE OF TRAFFIC

104.31.01 DESCRIPTION
Provide and maintain an accessible pedestrian route, to the “maximum extent feasible”, throughout the project’s limits. When an existing pedestrian access route within the public right of way is blocked by construction, alteration, or maintenance activity, an alternate accessible pedestrian route shall be provided.
The phrase, “maximum extent feasible”, applies in areas where the nature of an existing facility or site conditions makes it virtually impossible to comply fully with applicable accessibility standards through a planned alteration. In these circumstances, the alternate accessible pedestrian route shall provide the maximum physical accessibility that is feasible, or a design waiver must be approved by MDOT SHA’s Office of Highway Development.
104.31.02 MATERIALS
Not applicable.
104.31.03 CONSTRUCTION
Consider the following items when addressing accessible pedestrian maintenance of traffic:
(a) All pedestrians, including persons with disabilities, shall be provided with a reasonably safe, convenient and accessible path that replicates as much as practicable the existing pedestrian facilities.
(b) The width of the existing pedestrian facility should be maintained if practical. When it is not possible to maintain a minimum width of 60 in. throughout the entire length of the pedestrian route, a minimum width of 36 in. shall be provided with 60 in. x 60 in. passing zones at least every 200 ft, to allow individuals in wheelchairs to pass.
(c) Traffic control devices and other construction materials and features shall not intrude into the usable width of the sidewalk, temporary pathway or other pedestrian facility.
(d) Signs and other devices mounted lower than 7 ft above the temporary pedestrian pathway shall not project more than 4 in. into accessible pedestrian route.
(e) A smooth, continuous hard surface shall be provided throughout the entire length and width of the pedestrian route throughout construction. There shall be no curbs or vertical elevation changes greater than 1/4 in. in grade or terrain that could cause tripping or be a barrier to wheelchair use. Vertical elevation differences between 1/4 in. and 1/2 in. shall be beveled at a maximum 2:1 slope.
(f) When channelization is used to delineate a pedestrian pathway, a continuous detectable edging should be provided throughout the length of the facility such that pedestrians using a white cane can follow it. Edging should protrude at least 6 in. above the surface of the sidewalk or pathway with the bottom of the edging a maximum of 2.5 in. above the surface.
(g) Temporary ramps shall be provided when an alternate pedestrian route crosses a curb and no permanent ramps are in place. The width of the ramp shall be a minimum of 36 in. and the slope of the ramp shall not exceed 12:1. Temporary detectable warning mats must be installed at street crossings and signalized entrances.
(h) When possible, an accessible pedestrian route shall be provided on the same side of the street as the disrupted route. When it is not feasible to provide a same-side accessible pedestrian route an accessible pedestrian detour route shall be provided.
(i) Information regarding closed pedestrian routes, alternate crossings, and sign and signal information shall be communicated to pedestrians with visual disabilities by providing devices such as audible information devices, accessible pedestrian signals or barriers and channelizing devices that are detectable to the pedestrians traveling with the aid of a white cane or who have low vision.
(j) It is desirable that pedestrians cross to the opposite side of the roadway at intersections rather than mid-block. Appropriate signing shall be placed at the intersections.
(k) Access to transit stops shall be provided and maintained at all times.
104.31.04 MEASUREMENT AND PAYMENT
Unless otherwise specified, Accessible Pedestrian Maintenance of Traffic will not be measured but the cost will be incidental to the Lump Sum item for Maintenance of Traffic. The payment will be full compensation for all materials, labor, equipment, tools, and incidentals necessary to complete the work.