17-5 (N) Temporary Traffic Signal Inst allations
When a traffic signal is installed for control of traffic during construction of the project and scheduled for removal during or upon completion of the project, install and remove the temporary traffic signal as required. Upon removal of the temporary tra ffic signal, restore surface to like -new condition. Rake smooth unpaved areas, repave paved areas and seed grassed areas that were damaged by Contractor activities. Prepare intersection for sign control before removing the temporary traffic signal. Insta ll required regulatory signs in accordance with Sections 900, 901 and 903. Cover signs with burlap bags until traffic signal is placed into flashing operation. Place traffic signal into flashing operation and uncover signs simultaneously. Operate the flashing operation for a period of time as directed by the Engineer. Signal cabinets, controllers, detector units, signal heads and accessories and microwave detectors are property of the Department. Return Department owned equipment between 8:00 a.m. and 12:00 p.m. , Monday through Thursday, to the Traffic Services Office within the Division responsible for administration of the project . Assume ownership of removed poles, messenger cable, interconnect cable, communications cable, supporting hardware and loop emulator detection equipment, unless otherwise specified. 1700 -4 MEASUREMENT AND PAYMENT There will be no direct payment for work covered in this section. Payment at the contract unit prices for the various items in the contract will be full compensation for all work covered by this section. Repair , removal and replacement of damaged or unacceptable equipment or work under this section will be at no additional cost to the Department. The Department will deduct the cost of Department -owned equipment damaged by the Contractor from money due to the Contractor. If the Department performs maintenance and emergency service necessary to ensure continuous traffic signal operation, all expenses incurred by the Department in implementing this option will be deducted from payment due the Contractor, plus $2,500 liquidated damage per occasion, per day or any portion thereof, until corrected. 1705 -1 DESCRIPTION Furnish and install vehicle and pedestrian LED signal heads, visors, interconnecting brackets, wire entrance fittings, mounting assemblies, signal cable, lashing wire, pedestrian pushbutt ons (and associated lead -in cable), pedestrian signal signs, grounding systems and all necessary hardware. 1705 -2 MATERIAL Furnish m aterial, equipment and hardware under this section that is pre-approved on the ITS and Signals QPL available on the Department’s website. 1705 -3 CONSTRUCTION METHODS
A.General Bag new pedestrian and vehicle signal heads with burlap bags or bags made of non-ripping material specifically designed for covering signal heads until signal heads are placed in operation. Do not use trash bags of any type. When new signal heads are placed into operation, imme diately bag and remove signals heads that are not to be reused. Adjust each signal head vertically and horizontally so that light output will be of maximum
17-6 effectiveness for traffic and pedestrians. Do not tilt signal heads forward.
Reposition signal heads as required for various construction phases.
B.Vehicle Signal Heads Install vehicle signal heads such that the top of the signal housing located over any portion of a highway that can be used by motor vehicles is no more than 25.6 feet above the pavement. Install vehicle signal heads such that the maximum mounting height t o the top of the signal housing is as shown in Figure 1705- 1 if the location is between 40 f eet and 53 f eet from the stop line . Maximum Mounting Height of Signal Heads Located Between 40 Feet and 53 Feet from Stop Line Install vehicle signal heads such that the bottom of the signal housing and any related attachments to the signal head loc ated over any portion of a highway that can be used by motor vehicles is at least 16.5 feet above the pavement directly below the signal head.
1.Install vehicle signal heads such that the bottom of the signal housing (including brackets) of a signal head tha t is vertically arranged and not located over a roadway is as follows :
a.A minimum of 8 f eet and a maximum of 19 f eet above the sidewalk or, if there is no sidewalk, above the pavement grade at the center of the roadway.
b.A minimum of 8 f eet and a maximum of 19 feet above the median island grade of a center median island if located on the near side of the intersection.
2.Install vehicle signal heads such that the bottom of the signal housing (including brackets) of a signal head that is horizontally arranged and not located over a roadway is as follows :
a.A minimum of 8 f eet and a maximum of 22 f eet above the sidewalk or, if there is no sidewalk, above the pavement grade at the center of the roadway.
b.A minimum of 8 f eet and a maximum of 22 f eet above the median island grade of a center median island if located on the near side of the intersection. Where vehicle signal heads are installed on messenger cable, install mounting hardware consisting of messenger cable hanger, balance adjuster, bottom cap, wire entrance fitting Figure 1705 -1. Graph of maximum mounting height of signal heads.
17-7 bracket and insulating bushings.
Where vehicle signal heads are installed on mast arms, install mounting ha rdware consisting of rigid vehicle signal head mounting brackets. Install signal cable in continuous lengths between signal controller cabinets and signal heads. Route signal cable to minimize the length of cable installed and the number of cables and con ductors in each run. Pull 36 inches of additional signal cable into controller cabinets. Wrap signal cable to messenger cable with at least 4 turns of wrapping tape spaced at intervals less than 15 inches or lash signal cable to messenger cable with one 360° spiral of lashing wire per 12 inches . Make electrical connections inside each signal head, signal controller cabinet and termination compartment in metal poles. Do not splice cable at any other point between signal heads and controller cabinet. Coil sufficient signal cable beside each vehicle signal head to accommodate head shifts during various construction phases. For final signal head locations, coil 36 inches on each side of signal head if signal cable comes from both directions. If signal c able terminates at the signal head, coil 36 inches of signal cable on the same side as the cable run.
C.Pedestrian Signal Heads Install signs with mounting hardware immediately above pedestrian pushbuttons. Mount the pushbutton or accessible pedestrian signal (APS) at a minimum height of 3.5 feet but no higher than 4.0 f eet above the adjacent pedestrian travelway. Connect each pushbutton with a separate run of lead- in cable between the pushbutton and the termination panel in the controller cab inet. Bond pushbutton housing and all metal components to cabinet ground using lead -in cable ground. Mount pedestrian signal heads so the bottom of the signal housing, including brackets , is not less than 7 f eet or more than 10 f eet above sidewalk level . Position and adjust the heads to provide maximum visibility at the beginning of the controlled crosswalk. Ensure pedestrian signal heads and vehicular signal heads mounted on the same support are physically separated from each other.
D.Optically -Programmed Vehicle Signal Sections Install vehicle signal heads with optically -programmed vehicle signal sections so that movement of the vehicle signals head is restricted. Tightly tether vehicle signal heads at the top and bottom when installed on messenger cable . Attach vehicle signal heads using a mounting- bracket assembly that locks the vehicle signal head into position from the back and restricts movement when installed on mast arms.
E.Louvers Attach the louvers to the visors using stainless steel hardware. Position the signal head to give the viewing angle as shown in the plan s. 1705 -4 MEASUREMENT AND PAYMENT Vehicle Signal Head (____) and Pedestrian Signal Head (____) will be meas ured and paid as the actual number of signal heads of each type of material (aluminum or polycarbonate), size and number of sections furnished, installed and accepted. Vehicle Signal Head with Single Optically -Programmed Sections will be measured and paid as the actual number of signal heads containing a single optically- programmed section furnished, installed and accepted. Vehicle Signal Head with Multiple Optically -Programmed Sections will be measured and paid
Source: North Carolina Standard Specifications for Roads and Structures, 2024 Edition. Pages 803–805 of 857.