for Highway Construction Page 591 of 71 5 SECTION 656 – TRAFFIC CONTROL SIGNAL
656.01 Description.
Provide, install, and operate traffic control signal or components.
656.02 Materials.
Provide materials as specified in: Concrete ...................................................................................................................................... 502 Nonstructural Concrete ................................................................................................................ 509 Signs ........................................................................................................................................... 616 Illumination ................................................................................................................................... 619 Retroreflective Sheeting ......................................................................................................... 712.02 Illum ination and Traffic Control Signal Materials ........................................................................... 713 Submit a list of equipment and materials proposed for installation. For each item listed, include manuf acturer’s name, size, and catalog number. Submit manufacturer’s warranties, guarantees, instruction sheets, and parts lists for materials used in the signal installation upon project completion. Provide materials that bear the seal of approval of the UL, NEMA, or other approved t esting organizations. Materials must also meet the NEC requirements, local codes, and connecting utility requirements.
656.03 Construction Requirements.
Provide work that meets the NEC, local codes, and connecting utility requirements.
A.Salvage. The Contractor may use existing signalization equipment to aid in the control of traffic during construction. Salvage existing signalization equipment and remove in a neat, skillful manner and deliver to the Department. The Department will not pay for removal and salvage of this equipment separately.
B.Traffic Cabinet Evaluation & Testing . Submit the cabinet wiring schematic and the application programming for the control equipment for approval before fabrication begins. Submit the specified or preapproved controller, cabinet, and auxiliary equipment to be installed in the cabinet assembly to the Department for inspection, compliance with specifications, and operational testing before installation. Make the cabinet assembly submittals or re- submittals available to the Department for at least 30 business days. When there are multiple cabinet assemblies per contract, add an additional 5 business days per assembly. If the Contractor proposes to furnish cabinet assembly equipment other than the makes and models specified or preapproved, provide the complete control equipment and cabinet assembly for evaluation and testing for 45 business days. The Department may accept or reject such alternates depending on the evaluation to determine if the proposed alternate equipment is equal to or better than that specified. Resubmittals of for Highway Construction Page 592 of 715 nonspecified or non- preapproved equipm ent requires 45 business days for testing and evaluation. When there are multiple cabinet assemblies per contract , add an additional 5 business days per assembly. When components do not comply with the specifications or fail during testin g, the Engineer will reject the components, notify the Contractor of the rejection, and provide the date the components are available for pickup. The Department is not responsible for costs and contract delays associated w ith rejected components and resubmitted components. Coordinate installation of the cabinet mounted equipment with the signal cabinet supplier or the ITD Signal Shop. Deliver the equipment submitted for inspection and testing to: Idaho Transportation Department Signal Shop 8150 Chinden Boulevard Boise, Idaho 83714 After the Department’s evaluation and testing is complete, the Department will ship the approved equipment to the appropriate district office on the Department’s regular delivery schedule. Submit requests for alternative shipping methods, locations, or delivery schedules in writing for approval. If approved, the Department will deduct expenses incurred by the Department from the next progress payment estimate. Ensure that vehicle and pedestrian signal heads are installed with faces completely cov ered. Securely attach covers to prevent accidental removal or from being dislodged. Ensure covers remain in place and can only be removed during testing or temporary operation until the intersection has been permanently opened and the sig nal is operational. The Contractor may use opaque covers with a transparent center section or port for viewing of individual lens indications for testing that remain in place until the signal is placed in full operation.
C.Conduit
1.Place ment . The conduit installation locations shown on the plans are approximate. Adjust locations, as necessary, to avoid impacting utilities and drainage facilities while remaining within the public right -of-way. Conduit locations must be approved by the Engineer before ground disturbance. Do not install conduit and junction box es in the paved roadway, except for roadway crossing locations indicated on the plans or wi th prior written approval by the Engineer.
2.Locate Wire. Install locate wire in proposed traffic control signal conduit that contains traffic control signal cabling or are reserved for future traffic control signal use (spare). Install one locate wi re per conduit in the same conduit as the traffic control signal cabling and the spares. Unless otherwise indicated. Have a minimum of 5 feet of slack in locate wire in each junction box . Where multiple wires intercept in a junction box, bond together and have insulated. Furnishing and installing #12 THWN green jacketed copper locate wire is incidental to other traf fic control signal bid items.
D.Signal Wiring . Ensure the neutral wires are white and the wires are identified by attaching wire markers at terminal points. Mark the wires in accordance with the number on the field signal wiring diagram. Attach wire identification that is a one- piece marker and is the required size for the size of conductors installed. for Highway Construction Page 593 of 715 Use powdered soapstone, talc, or other approved lubricants when inserting conductors in conduit . Before proceeding to pull cable in the underground conduit runs, clean dirt or accumulations of moisture from conduit runs. Do not use winches or other power -actuated equipment not specifically designed for pulling wire. Ensure cable runs are continuous between the terminal blocks , as specified on the field signal wiring diagram. Do not splice between terminal blocks. Neatly arrange wiring within controller cabinets in bundl es in a squared corner pattern, and lace or tie wrap. Provide at least 4 fee t of slack cable in the cabinet base for each cable. Ensure cable shielding or jacket remains in place except the last 4 inches measured from the termination of the shortest wire in each cable. Use approved connectors on conduct ors at the terminal points. Tape off the extra c onductors and label as spares if cable with more conductors than called for in the wiring diagram is used.
E.Signal Housing. Install new signal housing, bracket(s), LED modules, visors, and back plates as specified in the pl ans. Install, direct, and veil optical programmed signals in accordance with the manufacturer’s written instructions. Mask each section of the signal with specified materials in an acceptable manner. The Engineer may require onsite help of the equipment manufacturer’s company representative for directing and veiling in accordance with the visibility requirements.
F.Detection
1.Inductive Loop Systems. Install detector loops as specified.
a.Cut th e slot approximately 1/16 inch wider than the loop cable and of sufficient depth to provide at least 1 inch of cover over the top wire if located in the top pavement course and ½ inch of cover if located in the bottom course.
b.Cut the slot corner on a diagonal or chamfered to prevent sharp cable bends. Remove sharp edges that might damage the loop cable jacket. Hydro clean and dry the slot with pressurized air to remove loose material before inserting t he loop wire.
c.Provide one continuous length of cable from the junction box around the loop area and back to the junction box. Splice loop conductors in the junction box.
d.One turn is once around the saw sl ot with the same cabl e. Two turns are twice around the slot with the same cable, and so forth.
e.Place the loop cable in the sawed slot in the same direction (clockwise or counter -clockwise) for loops on the same lane.
f.Use a blunt instrument to seat the l oop cable at the bott om of the sawed slot. Do not use a screwdriver or similar sharp tool that could damage the cable jacket.
g.A loop system is defined as 2, 3, or 4 loops in 1 lane that is connected to a detector loop amplifier.
h.Test each loop after ins tallation in the roadway and again after the slot has been sealed.
i.After the loop cable is installed in the cut slots and tested, fill the slot with an approved polyurethane resin sealant. for Highway Construction Page 594 of 715 j. Test the loop cables in the junction box with a permanent type wi re marker indicating approach, loop number, and input or output (e.g., Loop No.1, Lane a, the north approach, input = Na1+ and output = Na1- ).
k.Connect the lead- in cable to the loop wire only in a junction box with a soldered, waterproof splice . Make the splice insulating package so it includes loop leads and loop lead -in cable as one unit and extends at least 1 inch onto the outside jacket of the lead- in cable.
l.Ground the lead- in cable shield at the cabinet end to the system ground. Solder the cable shield at the junction box so the cable shield is continuous throughout the intermediate junction boxes included in the insulated splice to prevent grounding.
m.Run the test conductor continuous from the farthest junction box in each loop system to the controller cabinet. Do not splice in the test conductor.
n.Do not install electrical conductors carrying over 50 v olts in the loop detection conduits or junction boxes.
o.Comparative inductance test each loop system. Test each loop, as well as the system, the loop is associated with, as follows:
1.Ground Fault Test: Before splicing to the lead- in cable, test individual loops between the loop conductor and an approved ground point with a 500- volt hand -charged megohm meter. Test loop systems, with their leads un- terminated, at the control cabinet between 1 of the 2 lead- in conductors and approved ground point with a 500- volt hand- charged megohm meter. Ensure the minimum reading for the loop system test is at least 100 megohms. For the individual loop test, ensure the minimum reading on the hand- charged meter is infinity. Correct discrepancies before signal turn on.
2.Comparative Inductance Test: Check each loop system with an approved loop testing meter. Record and certify the values for the above tests, using Department -provided forms .
2.Radar, Video, Hybrid & Thermal Detection Systems. Install detection system and components necessary, both on signal poles and structures , and in a signal cabinet, for signal operations. Mounting brackets, cable, cable pulling, cabinet wiring, wiring harnesses and other miscellaneous hardware are considered part of the detection system and are incidental . Aim and configure the antennas and cameras for optimum field of view per manufacturer’s recommendations. Provide training for the system and programming processing unit. Have a manufacturer representative on site during the installation, initial programi ng, and initial signal startup unless otherwise directed by the Engineer.
3.Signal Inspection & Testing. Coordinate to have inspection of equipment performed by the District Signal Electrician s. Correct any failures to meet specif ications or operational needs identified from the final inspection at no additional cost to the State. for Highway Construction Page 595 of 715 Signal equipment items provided by the Department and installed by the Contractor that fail, due t o no fault of the Contractor, before fi nal project acceptance will be corrected by the Department at no expense to the Contractor. Submit manufacturer’s warranties, guarantees, instruction sheets, and parts lists for materials used in the signal installation upon project completion.
656.04 Method of Measurement.
The Engineer will measure acceptably completed work by the lump sum, and individual component systems and assemblies by the each.
1.Intersection traffic c ontrol signal structure will be paid by each intersection with any poles , mast arms, crossbeams, foundations, and necessary hardware shown in plans considered incidental . Concrete and steel materials and work is also incidental.
2.Signal heads will be paid by the each installed and includes housing, LED modules, backplates, tunnel visors, and brackets.
3.Preemption detection systems will be paid by each intersection installed and includes components, brackets, and wiring.
4.Detection systems will be paid by each intersection installed and includes components, brackets, wiring, and detection zones setup.
5.Electrical Service Pedestal will be pai d by each installed.
6.Cabinet and Servi ce pedestal foundations will be paid by each installed and includes concrete and steel materials and work, junction box es.
7.Signal Cabinet will be paid by each installed and includes components, wiring, foundations, and junction box es.
8.Signal controller will be paid by each installed.
9.Intersection pedestrian systems will be paid by each installed and includes pedestrian signal housings, guards, LED modules, brackets, push buttons, extension arms, back plates, cabinet components, and setup necessary for an intersection as called out in plans.
10.Pedestrian and traffic control signal head frangible poles are p aid by each installed and includes foundation, hardware, and pole and base components.
11.Additional electrical items will be paid for by lump sum as called out in plans and includes junction boxes, plasti c conduit s, rigid steel conduit s, wire of various types and voltage requirements, and miscellaneous electrical items f or a complete installation.
656.05 Basis of Payment .
The Department will pay for accepted quantities at the contract unit prices as follows: Pay Item Pay Unit Signal Housing ....................................................................................... Each Intersection Preemption Detection System ............................................. Each Intersection Detection System (Type) ..................................................... Each for Highway Construction Page 596 of 715 Electrical Service Pedestal (Type) .......................................................... Each Intersection Signal Structure (Type) ...................................................... Each Intersection Pedestrian System .............................................................. Each Signal Cabinet ........................................................................................ Each Signal Controller .................................................................................... Each Pedestrian & Traffic Control Signal Head Frangible Poles ..................... Each Cabinet & Service Foundation ................................................................ Each Additional Electrical Items ....................................................................... LS Excavation , backfillin g, surfacing, and materials are incidental to signal structure. Signs mounted on signal structures will be paid under the appropriate sign items in 616. Illumination on signal structure will be paid under appropriate items in 619. for Highway Construction Page 597 of 71 5 SECTION 657 – FLASHING BEACONS
657.01 Description.
Provide and install beacons and Rectangular Rapid Flashing Beacons (RRFB).
657.02 Materials.
Provid e materials as specified in: Concrete ...................................................................................................................................... 502 Signs and Sign Supports .............................................................................................................. 616 Traffic Signal Installation ............................................................................................................... 656 Traffic Signal Materials ................................................................................................................ 713 Use Class 40 A concrete for pole foundations.
A.Beacons. Provide 120- volt AC power ed or solar powered beacons as specified . The AC powered beacon assembly consists of pole, foundation, flashers (signal indications), signs, controller cabinet, conduit, mounting hardware, and hardware to complete the assembly. The solar powered flashing beacon assembly consists of pole, foundation, solar panel, flashers (signal indicat ions), signs, controller cabinet, battery cabinet, batteries, wireless communications hardware, conduit , mounting hardware, and hardware to complete the assembly. Provide beacons with two alternately flashing circular yellow signal sections which flash at a rate of at least 50 or more than 60 times per minute and where the illuminated period of each flash is at least ½ and not more than 2/3 of the total cycle. Ensure beacons dim to automatically adjust brightness. Provide NEMA 3R enclosures. When solar powered, size solar panels and batteries to ensure 100, 30- second, activations per day for up to 14 days between charging. Provide copies of calculations used to size the solar panels and batteries. Ensure batteries are installed in a weatherproof enclosure to ensure that exposure to the weather will not interf ere beacon operation.
B.Rectangular Rapid Flashing Beacons (RRFB). Provide 120- volt AC powered or solar powered RRFBs as specified. The AC powered RRFB assemblies consist of a paired crosswalk assembly of poles, foundations, RRFBs, signs, pushbutton assemblies, controller cabinet, conduit , and mounting hardware. The solar powered RRFB assemblies consists of a paired crosswalk assembly of poles, foundations, solar panels, RRFBs, signs, pushbutton assemblies, controller cabinet, battery cabinet, batteries, wireless communications hardware, conduit, mounting hardware, and hardware to complete the assembly. Ensure the peak luminous intensity (candelas) meet the requirements of SAE J595, Class 1. When actuated by a pedestrian, ensure the RRFB provides 75 flashing sequences per minute. Ensure the left and right RRFB indications operate as follows during each 800‐ millisecond flashing sequence:
1.Illuminate the left ‐hand side indication for approximately 50 milliseconds.
Source: Idaho Standard Specifications for Highway Construction, 2023 Edition. Pages 627–632 of 768.