6-332 SECTION 678 – TRAFFIC SIGNALS
678.01 DESCRIPTION . This work shall consist of furnishing, installing, or modifying a traffic signal,
including all items necessary to provide a complete and operational system.
678.02 MATERIALS . Material s shall meet the requirements of the following subsections:
Granular Backfill for Structures ................................ ................................ ................. 704.08 Mortar, Type IV ................................ ................................ ................................ ......... 707.0 1(e) Aluminum Filled Silicone Sealant ................................ ................................ ............. 707.1 1 Paint for Traffic Control Signals ................................ ................................ ................ 708.06 Bar Reinforcement ................................ ................................ ................................ .....713.01 Carbon Steel Bolts, Nuts, and Washers ................................ ................................ .....714.04 High Strength Structural Bolts and Assemblies, 120 ksi ................................ ........... 714.05 Anchor Bolts for Signals, Lighting, and Overhead Signs ................................ .......... 714.09 Galvanizing ................................ ................................ ................................ ................ 726.0 6 Retroreflective Sheeting ................................ ................................ ............................. 750.0 4 Pedestal Posts and Bases ................................ ................................ ............................ 752.01 Traffic Signal As sembly ................................ ................................ ............................ 752.02 Traffic Signal Heads ................................ ................................ ................................ ..752.03 Traffic Signal Controllers and Cabinets ................................ ................................ ....752.04 Aerial Flashing Beacons ................................ ................................ ............................ 752.05 Electrical Conduit ................................ ................................ ................................ ......752.06 Traffic Signal Conductor Cable ................................ ................................ ................. 752.07 Vehicle Detectors ................................ ................................ ................................ .......752.08 Junction Boxes and Pull Boxes ................................ ................................ .................. 752.09 Accessible Pedestrian Signals ................................ ................................ .................... 752.10 Grounding Electrodes ................................ ................................ ................................ 752.11 Pan-Tilt-Zoom Camera ................................ ................................ .............................. 752.12 Emergency Vehicle Preemption System ................................ ................................ ....752.13 Concrete shall conform to the requirements of Section 541 for Concrete, Class HPA. Steel reinforcement shall conform to the requi rements of Section 507 .
678.03 GENERAL REQUIREMENTS . Traffic signals shall be installed as shown on the Plans and as
specified in the Contract. All design details, submittals, materials, installation, and wiring shall be performed in accordance with the applicable documents listed below, and other industry standards as appropriate. 6-333 (a) National Electrical Code
b.National Electrical Safety Code
c.NEMA TS 2
d.MUTCD
e.Americans with Disabilities Act
f.AASHTO Standard Specification for Structural Supports for Highway Signs, Luminaires, and
g.MREI 10 -01
678.04 SUBMITTALS . The Contractor shall submit working drawings in accordance with Subsection
105.0 6. All submittals shall indicate, on the drawings or in the cover letter, that the Contractor has reviewed the submittals and that they are in conformance with the Contractor’s proposed installation procedures.
a.References . All submittals shall indi cate conformance with the applicable documents listed in Subsection 678.03 and the Contract.
b.Contractor Qualifications . Documentation shall be provided to the Engineer prior to commencing signal work that the work will be performed under the supervision of a licensed master electrician with IMSA Traffic Signal Construction Technician Level II certification.
c.Required Submittals .
1.Traffic Signal Controller . Fabrication drawings shall be provided identifying the following:
a.Manufacturer, model, and type
b.Controller programming data
2.Controller Cabinet . Fabrication drawings shall be provided identifying the following:
a.Manufacturer, model, and type
b.Dimensions
c.Ancillary Equipment
d.Finish (coating and color)
3.Bench Test Results . Successful bench testing results, using the approved controller programming data, shall be provided for new controller cabinets. When a new controller is 6-334 being installed with a new cabinet, they shall be tested together. When a salvaged controller is being installed in a new cabinet, the cabinet shall be tested using the same model controller running the proposed timings. Bench testing shall be performed by an independent third -party testing entity. The test shall be performed or supervis ed by a licensed professional engineer or technician with IMSA Traffic Signal Bench Technician Level II certification. A report shall be provided with the following information:
a.Testing entity and location of testing
b.Testing date and begin and end t ime
c.Controller settings used
d.Equipment serial numbers
e.Name, credentials, and signature of individual responsible for the test results Controllers or cabinets shipped prior to Agency approval of the bench test results shall be at the sole risk of the Contractor. The Contractor shall be responsible for any costs related to a rejected controller or cabinet.
4.Traffic Signal and Pedestria n Heads . Fabrication drawings shall be provided identifying the following:
a.Manufacturer and model
b.Material specifications and dimensions
c.Wiring
d.Housing dimensions, material, and color
e.Lens material and color
f.Mounting bracket
g.Visor shap e and color
h.Backplates (if applicable) 6-335 (5) Traffic Signal Assembly .
a.Design calculations shall include the following:
1.The design axial and shear forces and bending and torsional moments acting at the top of the foundation
2.The design axial, bending, and shear stresses and the combined stress ratio
3.Vibration and fatigue calculations as set forth in the required AASH TO standard listed
4.The allowable axial, bending, and shear stresses
5.The calculations required in Subsection 678.04(c)(5)a.1. , Subsection 678.04(c)(5)a.2. , and Subsection 678.04(c)(5)a.4. shall be shown for each group loading and for the basic wind l oad applied to the two cases outlined in the AASHTO standard listed
b.Fabrication drawings shall include the following:
1.Detailed drawings of each component of the structure
2.Material specification for each component of the structure, either by complete specification or reference to the applicable ASTM standard
3.The project name, project number, Contract number, route number, and structure number on each sheet
4.Details fo r location of signs or signals and attachment hardware for the support structure
5.All elevation and dimensions necessary to provide a complete set of record plans
6.Dead load deflection and vertical rise information
7.Welding details and procedures f or all welds
8.Bolt tensioning requirements
9.Finish (coating and color) 6-336 (6) Pedestal Posts . Fabrication drawings shall be provided identifying the following:
a.Dimensions and connection details
b.Material specifications
c.Finish (coating and c olor)
d.Foundation
7.Vehicle Detection System . Fabrication drawings shall be provided identifying all components of the vehicle detection system including, but not limited to, the following:
a.Manufacturer, model, and type
b.Processing hardware
c.Wiring
d.Proposed installation locations
e.Documentation that installation locations and mounting hardware are in conformance with the manufacturer’s recommendations
8.Emergency Vehicle Preemption System . Fabrication drawings shall be provi ded identifying all components of the emergency preemption system including, but not limited to, the following:
a.Manufacturer, model, and type
b.Processing hardware
c.Wiring
d.Proposed installation locations.
e.Documentation that installation locatio ns and mounting hardware are in conformance with the manufacturer’s recommendations.
9.Ancillary Equipment . Fabrication drawings shall be provided identifying all required ancillary equipment including, but not limited to, the following :
a.Manufacturer, model, and type
b.Functions 6-337 678.05 CONSTRUCTION REQUIREMENTS .
a.Incidental Work . Unless otherwise shown in the Contract, the Contractor shall perform all excavations, backfilling, and resurfacing work, including removal and replacement of curbs, sidewalks, paved surfaces, and any other materials necessary to complete the work in acco rdance with the applicable sections of the specifications. All pavement surfaces to be removed shall be saw -cut to the full pavement depth along the neat lines of the area to be removed. All landscaping and underground utility systems that have been dist urbed during construction shall be restored to their original condition upon the completion of the work. Backfill of suitable material shall be placed and compacted in layers not exceeding 6 inches. Backfill for footings shall meet the requirements of Subsection 704.08 .
b.Foundations . Foundations shall be designed in accordance with the Contract. All foundations shall meet the following requirements:
1.A minimum embedment depth of five feet shall be used for all spread footing foundations, measured f rom the ground surface elevation to the bottom of footing elevation.
2.For drilled shaft foundations, concrete shall be poured against undisturbed soil unless a permanent casing is designed for, and appropriate supporting calculations are provided. The top two feet of soil shall be neglected for design purposes. A disposable circular concrete form, if used, shall not be placed deeper than two feet, in order to not reduce the friction between the soil and the concrete.
3.As an alternative to the drille d holes, footings may be poured in excavated holes using the proper forms, which shall be removed. The excavated holes shall be at least two feet clear of the foundation sides and one foot deeper than the foundation. Care shall be taken to avoid excavating around the top of the foundation. The backfill material shall be compacted as described in Section 204 . The same design limits as for drilled footings apply.
4.Any backfill placed adjacent to the footing shall be granular material meeting the requireme nts of Subsection 704.08 . It shall be compacted as described in Section 204 . 6-338 (5) Concrete for the foundation shall conform to the requirements of Section 541 . If a different class of concrete is required for drilled shaft foundations, it shall be inclu ded in the submittal.
6.Reinforcing steel for mast arm pole foundations shall be in accordance with Section 507 .
7.Steel piles, if used, shall meet the requirements of Section 505 .
8.When the design depth of a foundation cannot be obtained due to un foreseen field conditions, the Contractor shall notify the Engineer and resubmit the foundation design.
c.Electrical Conduit Sleeves . Electrical conduit sleeves shall be installed in accordance with Subsection 625.04(b) . The Contractor shall seal the ends of conduit sleeves with a material that will not decompose prior to backfilling the sleeve.
d.Conduit . Electrical conduit shall be installed in accordance with Subsection 625.04(c) . Unless otherwise specified, the conduit shall be laid in a straight line with no bends except preformed bends and at the entrance to a pull box, junction box, or a concrete base. For metal conduit, all couplings shall be tightened until the ends of the conduit are together. Any cutting of the conduit shall be made squarely so that the resulting ends will butt together over their full area. The ends of conduits shall be reame d and have threaded connections. Slip joints or running threads shall not be used for couplings. The exposed ends for all types of conduits shall be capped with standard conduit caps until wiring starts, at which time they shall be replaced with approved b ushings. Either elbows or sweeps may be used for entering concrete bases, but elbows shall be used at the base of a service pole on the street quarter of the pole. All unused conduit and void space in wired conduit that terminates in a traffic signal cabi net, mast arm pole, junction box, or pull box shall be plugged with steel wool and capped with a standard conduit cap .
e.Junction Box . Junction boxes shall be installed in accordance with Subsection 625.04(e) . 6-339 (f) Grounding . Each traffic signal sys tem shall be grounded. The ground shall consist of the following:
1.An internal ground lug opposite the hand hole.
2.A No. 6 AWG minimum soft drawn copper grounding electrode conductor.
3.A 5/8 inch × 8 foot minimum copper clad grounding electrode. The resistance to ground shall be 25 ohms or less. Additional grounding electrodes may be required, with a minimum spacing of 6 feet. When a power service meter and disconnect are attached to a pole, there shall be a continuous ground wire from the meter and disconnect, which may run internal to the upright, through the 1/2 inch flexible tubing in the concrete base to the required grounding electrodes. The ground wire from the pole grounding lug, controller cabinet, or luminaire may attach to thi s continuous grounding electrode from the service meter and disconnect. The Contractor shall perform a resistance to ground test on the continuous grounding electrode from the service meter and disconnect and provide a submittal to the Engineer from a mas ter electrician certifying that the grounding electrode is continuous from the service meter and disconnect and the resistance to ground is 25 ohms or less. If the resistance is greater than 25 ohms, at least one additional ground rod will be required unti l the resistance is brought down to 25 ohms or less.
g.Grounding Electrodes and Couplings . Each metal pole that is part of the traffic signal system shall be grounded. The grounding electrodes shall be driven vertically until the top of the rod is at least 4 inches below the finished ground at a location one foot from the pole foundation. The grounding electrode coupling and grounding electrode shall be compliant with Subsection
752.11 Grounding electrodes shall be connected to the post or pole base u sing grounding
conductors in accordance with Subsection 752.11(c) . The grounding electrode coupling shall be attached to the grounding electrode by an exothermic welding process or UL listed mechanical clamp.
h.Power Drop Stanchion . Power drop stanchion s shall meet the requirements of Section 625 .
i.Traffic Signal Assembly . Traffic signal assemblies shall be installed as shown on the Plans or as directed by the Engineer. 6-340 (1) Erection of Posts and Poles . All posts and poles shall be erected on concre te foundations at the locations shown on the Plans or as directed by the Engineer. The space between the top of the concrete footing and metal base of the support shall be sealed with wire screen. All poles shall be level and plumb in the final loaded condition. In the erection of posts and poles, leveling nuts shall be provided for installation between the bases and concrete foundation. When aluminum alloys encounter other materials, the contacting surfaces shall be thoroughly cleaned and coated with a silicone sealant that will adhere to aluminum and concrete. Before erecting the pole, the Contractor shall clean the top of the foundation of any laitance, oils, grease, or any other deleterious mater ials. The Contractor shall not install mast arm poles until the foundation has achieved 85% of the specified 28 -day concrete strength based on field cured cylinders.
2.Fabrication . All mast arms, mast arm poles, foundations, and miscellaneous hardware shall be fabricated in accordance with the Contract. All components for mast arms and mast arm poles shall be obtained from the same fabricator. Each mast arm pole shall include a pole tag. The information shall be stamped on a metal tag riveted to the pol e near the hand hole. The tag shall include the following information:
a.Mast Arm Pole s.
1.Diameter
2.Height
3.Yield strength
4.Gauge
b.Mast Arms .
1.Diameter
2.Length
3.Yield strength
4.Gauge 6-341 All components shall be protected from damage during shipping and handling by wrapping or other effective methods. Wrappings shall be removed no more than 5 calendar days after receipt of components, or immediately if the wrappings become saturated. Failure to comply with these requirements may lead to damage of the coating system and will be cause for the rejection of the component. Any component that is determined to be damaged beyond repair by the Engineer shall be replaced at no additional cost to the Agency.
3.Protective Coating . All steel components, except concrete reinforcing, shall be hot dipped galvanized. The assemblies shall be designed and fabricated to permit galvanizing on all interior and exterior surfaces and shall be free of pockets and other structural obstructions that will not permit proper deposition of zinc coating. Galvanizing and repairs to damaged galvanized surfaces shall be in accordance with Subsection 726.0 6.
4.Screen Installation . The Contractor shall install a wire screen covering the gap between the bottom of the base plate and the top of the concrete foundation. The wire screen shall be in full contact with the top of the mast arm pole foundation and the mast arm pole base plate. The wire cloth shall be stainless steel with a 1/4 inch ma ximum opening and a minimum wire diameter of No. 16 AWG with a 2 inch lap. It shall be secured with 3/4 inch stainless steel banding after anchor bolts are fully tightened.
5.Anchor Bolts . Anchor bolts shall conform to Subsection 714.09 and shall be tigh tened in accordance with Subsection 677.03 . After installation, a minimum of two threads on the bolt shall be exposed above the nut.
6.Flange Bolts . All flange bolts, hex nuts, and washers shall conform to Subsection 714.05 . The flange bolts shall be ca pable of resisting 133% of the full design stress of the tube at its yield strength stress. Flange bolts shall be tensioned in accordance with Subsection 506.1 8. Direct tension indicators are required.
7.U-Bolts . U-bolts and associated hardware shall co nform to Subsection 714.04 . All U -bolts and hardware shall be galvanized in accordance with Subsection 726.0 6.
8.Welding . Any welds shall be at least as strong as the materials being welded. Any welds shall be performed in accordance with Subsection 506. 10. High strength bolts, nuts and washers shall be tensioned in accordance with Subsection 506.1 8. Field verification testing for direct tension indicators is not required. 6-342 All materials greater than 1/2 inch thick shall meet the Charpy V -notch impact r equirements for the specified material. Testing and sampling shall be in accordance with AASHTO T 243 . Horizontal members shall be cambered as specified on the Plans.
j.Cabinet Assembly . The cabinet shall be installed at the location shown on the Plans or as directed by the Engineer. The cabinet shall be oriented so that the door opens away from the intersection or roadway and does not block a sidewalk or passageway. The cabinet assembly shall consist of a traffic controller, ancillary equipment (includ ing monitors, load switches, flasher, flash transfer relay, power supplies), and other equipment wired into a controller cabinet to make a complete and operational assembly. All cabinet assemblies shall provide functionality that meets or exceeds operation al characteristics, including NTCIP support, as described in NEMA TS 2 . All wiring shall be neat and secured and comply with all necessary electrical codes. The cabinet shall be ground mounted unless otherwise specified on the Plans. Ground mounted cabine ts shall be installed on a level, concrete foundation in conformance with Section 541 . Ground mounted cabinets shall be sealed at their base with aluminum filled silicone sealant in conformance with Subsection 707.1 1. If the Plans specify that the cabinet be installed on an extended base, the area where the extended base meets the cabinet assembly and where it meets the concrete foundation shall be sealed with aluminum filled silicone sealant in conformance with Subse ction 707.1 1. The cabinet shall be supplied with signal layout sheets, wiring diagrams, pin assignment chart, conductor phase assignments, and manuals for circuits and components. These documents shall be stored in the cabinet in a resealable, weatherproo f container , with the signal sheet laminated . All equipment installed within the cabinet shall be labeled on the cabinet shelving. The turn -on or switch -over date shall be labeled inside the cabinet door. The traffic signal controller and auxiliary equip ment shall be installed within the traffic signal cabinet as specified on the Plans. All equipment installed in the traffic signal cabinet shall be in accordance with Section 752 . The Contractor shall provide an electronic copy of the final controller con figurations prior to acceptance of the traffic control signal system.
k.Signal Heads . Signal heads shall be placed as shown on the Plans unless otherwise directed by the Engineer. Horizontal spacing of the signal heads and vertical clearances shall meet the requirements of the MUTCD and the Plans. 6-343 All signal head wires shall be continuous runs from the signal head to the controller cabinet. A separate neutral circuit shall be wired and returned to the controller cabinet from each phase. All terminal blocks shall be installed behind the red signal housing. Where traffi c signals are installed and not put into service immediately, or placed out -of-service temporarily, signal heads shall be covered in order to conceal them. The Contractor shall conceal the signal heads by securely placing burlap bags or other coverings app roved by the Engineer. The covering shall be open at the bottom to prevent the buildup of condensation.
l.Wiring . All wiring shall be performed in accordance with the National Electrical Code . Splices shall only be made at pull boxes, junction boxes, or pole bases. All splices shall be electrically and mechanically secure and shall be insulated for 600 volts. The completed splice shall be watertight and shall test electrically equal to or greater than the cable. All splices shall be soldered, using rosin core solder, and then be fully sealed using a method approved by the Engineer. Unless otherwise shown on the Plans, each cable shall have a minimum of 3 feet of slack in each box or base. Where shown on the Plans, wired conduit may be either pre -wired before the conduit is installed or the wire may be installed after the conduit is installed. The Contract item for wired conduit includes both the conduit and the wires contained within the conduit, however, the wires and the conduit shall not be attached to each other and the wires shall be readily pulled from the conduit for replacement without excessive effort. Except when otherwise shown on the Plans, the minimum size for installed conduit shall be nominal 2 -inch inside diameter conduit or it shall m atch the size of the existing conduit to which it is to be attached. In either case, the installed conduit shall be of sufficient inside diameter to contain wiring of a size such that the voltage drop in the secondary circuits will not exceed 3%. Wiring conduits shall have a sufficient inside diameter such that the combined cross -sectional area of the wiring does not exceed the percentage of conduit fill specified in the National Electrical Code . Conduits shall, in accordance with the other requirements o f this subsection, contain all the wiring necessary to make the completed system or subsystem functional. Where electrical wiring is shown on the Plans, the Contractor shall remove the existing wiring, if such exists, from the existing conduit, strain po le, streetlight pole, or bracket arm and shall install new wiring meeting all code and specification requirements. The wiring shall be of a size such that the voltage drop in the secondary circuits will not exceed 3% and the wiring shall contain only the number of conductors necessary to make the completed system or subsystem function. 6-344 The minimum wire sizes for circuits shall be as specified in Table 678.05A . TABLE 678.05A – MINIMUM SIGNAL WIRE SIZES Service AWG From supply to disconnect No. 6 Ground No. 6 Disconnect to controller or flasher No. 6 Controller to signals or beacons No. 14 Controller to pavement units No. 14 Controller to push button No. 14 Interconnect figure 8 No. 12 (solid) There shall be a neutral wire for every eight or fewer ungrounded conductors. The Contractor shall furnish and install sufficient cable and wire to operate the system properly as shown on the Plans and as specified and shall provide at least two spare co nductors in all signal and interconnect cable runs, including emergency and railroad preemption cables. Where practicable, the Contractor shall wire the system in accordance with the color -coding system specified in Table 678.05B . TABLE 678.05B – SIGNAL WIRE COLOR -CODING Wire Color Application Red Red light Orange Yellow light Green 1 Green light White Common ground for all signals and exposed metal parts Blue Arrows Remaining Push buttons and spare 1 Green wires shall be tagged NOT GROUNDED WIRES 6-345 When wiring vehicle signal heads, the Contractor shall install a minimum of one No. 14 AWG 7 - conductor signal cable from the controller cabinet to the mast arm pole base for each phase . For vehicle signal heads, the Contractor shall install a minimum of on e No. 14 AWG 7 -conductor cable for each signal phase to the base of the mast arm pole wired in parallel. For pedestrian signal heads, the Contractor shall install a minimum of one No. 14 AWG 5 -conductor signal cable from the controller cabinet to each pede strian head installation (no more than 3 wires per terminal) and push button location to operate either one or two pedestrian signal heads. Pedestrian buttons shall use “home run” wiring back to the signal cabinet with no more than 2 wires per terminal per phase. Colored electrical tape intended to denote what phase the wiring is associated with shall be wrapped around the corresponding wire within the cabinet as specified in Table 678.05C . TABLE 678.05C – ELECTRICAL TAPE COLOR -CODING Phase Electrical Tape Color Phase 1 1 blue stripe Phase 2 1 green stripe Phase 3 1 yellow stripe Phase 4 1 red stripe Phase 5 2 blue stripes Phase 6 2 green stripes Phase 7 2 yellow stripes Phase 8 2 red stripes Pedestrian Orange stripe with associated phase stripes
m.Vehicle Detection System . The vehicle detection system shall be as specified on the Plans. All work associated with the vehicle detection system shall be completed prior to testing and turn -on of the traffi c signal system. All equipment shall be installed and wired in a neat and orderly manner in conformance with the manufacturer’s instructions. All of the vehicle detection system components shall be current production equipment produced by the same manufac turer for system operation compatibility purposes unless otherwise specified. 6-346 The Contractor shall install the detector to achieve the desired fields of detection as shown on the Plans or as directed by the Engineer. Routing of the detector cable shall provide a drip loop for protection of the detector and connector. The detector c able shall be installed as a continuous run with no splices from the detector to the processor in the traffic control cabinet unless specified otherwise by the manufacturer. The Contractor shall be responsible for furnishing all training, labor, materials , cables, connectors, tools, equipment, shipping, and incidental items necessary to complete the installation and make the vehicle detection system fully operational.
n.Pan-Tilt-Zoom Cameras . All pan -tilt-zoom cameras shall be installed as specified on the Plans or as directed by the Engineer. The camera shall be installed in a location with optimal view of the intersection per the manufacturer’s guidance.
o.Pedestrian Equipment . All pedes trian equipment shall be placed at the locations shown on the Plans or as directed by the Engineer. A pedestrian actuation sign shall be included with each push button assembly. Tactile arrows shall be aligned parallel with the direction of the crossing.
p.Pedestal Post Assembly . All pedestal post assemblies shall be installed at the locations shown in the Plans or as directed by the Engineer. Pedestal post assemblies shall consist of a pole, transformer base, and concrete foundation. All grounding shall meet the requirements of Subsection 678.05(f) .
q.Aerial Flashing Beacon . Aerial flashing beacons shall be installed as specified on the Plans or as directed by the Engineer. Work shall consist of furnishing and installing flashing beacon signal heads, including poles, mounting equipment, signal cable, flash relay, and enclosure at the locations shown on the Plans or as directed by the Engineer. The Contractor shall notify the Engineer a minimum of 48 hours prior to replacing existing or installing new aerial flashing beacons. A uniformed traffic officer shall be present to maintain traffic while the work is being performed as directed by the Engineer . All existing flashing beacon signal heads to be replaced shall be replaced with new LED flashing beacon signal heads at the locations shown on the Plans or as directed by the Engineer. All existing flashing beacon signal heads and mounting equipment replaced shall be disposed of by the Contractor. 6-347 (r) Emergency Vehicle Preemption System . All equipmen t shall be installed and wired in a neat and orderly manner in conformance with the manufacturer’s instructions. All emergency vehicle preemption system components shall be current production equipment produced by the same manufacturer for system operation compatibility purposes unless otherwise specified. All traffic signal installations shall be supplied with a single emergency vehicle preemption receiver for each mainline approach to the intersection as noted in the major list of equipment or as directe d by the Engineer. Emergency vehicle preemption system receiver and confirmation strobe locations shall be determined by the Contractor in accordance with the manufacturer’s guidance, if available. Confirmation strobes shall serve to validate to the driv er of the emergency vehicle that the traffic signal has recognized the preemption call and will initiate the proper preemption sequence. The confirmation strobes shall be illuminated whenever any emergency vehicle triggered preemption green is on. The conf irmation strobes shall have a red lens. The emergency vehicle preemption system shall have full ID and logging capabilities. Programming of the emergency vehicle preemption system shall be via a PC -based computer using unit-specific software. A hard copy of final programming data shall be left in the controller cabinet. The Contractor shall supply a complete set of interface cables for laptop connection in each controller cabinet. The Contractor shall coordinate with local emergency services to test the em ergency vehicle preemption system prior to the beginning of the 30 calendar day test period.
s.Turn -On and Testing . Prior to turn -on and testing, all construction of the signal system shall be complete.
1.Turn -On. The traffic signal shall not operate without the pavement markings and signal related signing in place. Full operation for a new installation or switch -over for replacement signals shall not be initiated except in the presence of the Project Manager , Traffic Signal Operations Engineer, or a d esignated representative. A uniformed traffic officer shall be required at every turn -on.
a.Existing Signals . Any locations that require a switch -over from one traffic signal system to another do not require a flash period.
b.New Signals . Traffic signals installed at locations that were previously unsignalized shall be operated in flash mode for a minimum of 48 hours prior to being put into full operation. 6-348 (2) Testing . Once all equipment is installed and the traffic signal has been turn ed on, an inspection to start the 30 calendar day test period shall be scheduled. Each traffic control signal system shall successfully complete a minimum 30 calendar day test period. The required 30 calendar day test period for the signal system shall not begin until all construction of the signal system has been complete d and the Engineer has received notice from the responsible Agency parties that all paperwork, including fabrication drawings, materials certifications, bench test reports, etc., related t o the signal equipment and installation have been completed to the satisfaction of the Agency.
a.The Contractor shall submit a request to the Engineer to begin the 30 calendar day test period.
b.An in -depth inspection including the Project Manager and the Traffic Signal Operations Engineer, or their representatives, will be conducted to start the 30 calendar day test period. A written punch list of items will be provided to the Contractor to corre ct by the end of the 30 calendar day test period.
c.The test period for the traffic signal shall be at least 30 calendar days of continuous, satisfactory operation. If a component or system fails or shows unsatisfactory performance, the condition shall be corrected and the test restarted until 30 calendar days of continuous satisfactory operation have been completed. The traffic signal will not be accepted until successful completion of the test period. Once the 30 calendar day test period has been suc cessfully completed, the Engineer will notify the Project Manager and the Traffic Signal Operations Engineer that the above criteria have been met and that the Agency is now responsible for the maintenance of the traffic control signal system. The name of the power company and the account number on the power bill shall be included for the District Transportation Administrator’s records.
t.Maintenance of New and Existing Equipment . The Contractor shall be responsible for all maintenance costs for new and existing signals and beacons , starting from the installation of construction approach signing and lasting until project acceptance. This period shall include any winter shutdowns during the Contract period. Replacement of poles , cabinets , or controllers wi ll not be considered maintenance costs unless the loss is due to the Contractor’s negligence. 6-349 At the discretion of the Engineer, the Contractor may be required to replace poles and cabinets or controllers that are lost or damaged due to an accident, o r to perform routine repairs to existing signals that are not necessitated by the Contractor’s operations. If required, such work will be considered extra work under Subsection 109.06 and additional payment will be allowed. Any equipment that is defective or damaged prior to the beginning of the Contract shall be maintained in at least as good condition until it is replaced as part of the Contract.
678.06 METHOD OF MEASUREMENT . The quantity of Removal of Existing Traffic Control Signal
System to be measure d for payment will be the number of each traffic control signal system removed in the complete and accepted work. The quantity of Cabinet Assembly; Mast Arm Pole Foundation; Pedestal Post Assembly; Pedestrian Signal Assembly; Traffic Signal Assembly; Traffic Signal Head Assembly; Flashing Beacon, Aerial Mounted; Vehicle Detection System; Pan -Tilt-Zoom Camera; and Emer gency Vehicle Preemption System to be measured for payment will be the number of each installed in the complete and accepted work.
678.07 BASIS OF PAYMENT . The accepted quantity of Removal of Existing Traffic Control Signal
System will be paid for at the Contract unit price per each. Payment will be full compensation for removing and handling the existing traffic control signal system components as specified in the Contract and for furnishing all labor, materials, tools, equipment, and incidentals necessa ry to complete the work. The accepted quantity of Cabinet Assembly will be paid for at the Contract unit price per each. Payment will be full compensation for furnishing all training, labor, materials, tools, equipment, wiring, and any incidentals necessa ry to complete the work. The accepted quantity of Mast Arm Pole Foundation will be paid for at the Contract unit price per each. Payment will be full compensation for furnishing all labor, materials, tools, equipment, and incidentals necessary to complete the work. The accepted quantity of Pedestal Pole Assembly will be paid for at the Contract unit price per each. Payment will be full compensation for providing the pedestal pole; transformer base including grounding lugs and related mounting hardware; co ncrete foundation, leveling shims, corrosion prevention; and all training, labor, materials, tools, equipment, and incidentals necessary to complete the work. The accepted quantity of Pedestrian Signal Assembly will be paid for at the Contract unit price per each. Payment will be full compensation for furnishing pedestrian signal heads, mounting hardware, all training, labor, materials , wiring, tools , equipment , and incidentals necessary to complete the work. The pedestal pole assembly will be paid separat ely. 6-350 The accepted quantity of Traffic Signal Assembly will be paid for at the Contract unit price per each. Payment will be full compensation for furnishing all training, labor, materials, tools, equipment, and incidentals necessary to complete the work . The accepted quantity of Traffic Signal Head Assembly will be paid for at the Contract unit price per each. Payment will be full compensation for furnishing all training, labor, materials, tools, equipment, wiring, and incidentals necessary to complete the work. The accepted quantity of Flashing Beacon, Aerial Mounted will be paid for at the Contract unit price per each at each designated location. Payment will include strain poles, span wire, attachment hardware, beacon heads, and all other materials n ecessary for a fully operational flashing beacon system. Sign posts and panels will be paid for under the applicable Contract items. The accepted quantity of Vehicle Detection System will be paid for at the Contract unit price per each. Payment will be fu ll compensation for furnishing all training, labor, materials, tools, equipment, wiring, and incidentals necessary to complete the work. Removal and disposal or salvage of existing detection systems will be considered incidental to other Contract items. The accepted quantity of Pan -Tilt-Zoom Camera will be paid for at the Contract unit price per each. Payment will be full compensation for furnishing all training, labor, materials, tools, equipment, wiring, and incidentals necessary to complete the work. The accepted quantity of Emergency Vehicle Preemption System will be paid for at the Contract unit price per each. Payment will be full compensation for furnishing all training, labor, materials, tools, equipment, wiring, and incidentals necessary to comple te the work. Removal and disposal of existing emergency vehicle preemption systems will be considered incidental to other Contract items.
a.Partial payments for Flashing Beacon, Aerial Mounted will be made as follows:
1.The first payment of 90% of the Contract unit price will be made upon receipt by the Engineer of notice from all responsible Agency parties that all paperwork related to the beacon installation has been completed to the satisfaction of the Agency, and upon installation of a functioning system as indicated by a successful continuous 24 -hour operation test period.
2.The remaining 10% of the Contract unit price will be paid upon successful completion of the 30 -day test control period. 6-351 (b) Partial payments for Cabinet Assembly; Mast Arm Pole Foundation; Pedestal Post Assembly; Pedestrian Signal Assembly; Traffic Signal Assembly; Traffic Signal Head Assembly; Vehicle Detection System; Pan -Tilt-Zoom Camera; and Emergency Vehicle Preemption Sys tem will be made as follows:
1.The first payment of 35% of the Contract unit price will be made upon receipt by the Engineer of notice from all responsible Agency parties that all submittals related to the signal installation have been completed to the satisfaction of the Agency.
2.The second payment of 40% of the Contract unit price will be made upon installation of a functioning system as indicated by a successful continuous 24 -hour operation test period.
3.The third payment of 1 5% of the Contrac t unit price will be paid upon successful completion of the 30 calendar day test period.
4.The remaining 10 % of the Contract unit price will be paid upon project acceptance . Payment will be made under: Pay Item Pay Unit 678.1000 Removal of Ex isting Traffic Control Signal System ................................ Each 678.2005 Cabinet Assembly ................................ ................................ ..................... Each 678.2010 Mast Arm Pole Foundation ................................ ................................ .......Each 678.2015 Pedestal Post Assembly ................................ ................................ ............ Each 678.2020 Pedestrian Signal Assembly ................................ ................................ ......Each 678.2025 Traffic Signal Assembly ................................ ................................ ........... Each 678.2030 Traffic Signa l Head Assembly ................................ ................................ ..Each 678.2035 Flashing Beacon, Aerial Mounted ................................ ............................ Each 678.2040 Vehicle Detection System ................................ ................................ ......... Each 678.2045 Pan -Tilt-Zoom Camera ................................ ................................ ............. Each 678.2050 Emergency Vehicle Preemption System ................................ ................... Each 6-352 SECTIO N 679 – STREE T LIGHTING 679.0 1 DESCRIPTION . This work shall consist of removing, furnishing, and installing the street lighting components and other illumination elements necessary to provide a complete and operational system. Street light assemblies shall consist of light pole foundations, transformer bases, light poles, bracket arms and luminaires. 679.0 2 MATERIALS . Materials shall meet the requirements of the following subsections: Anchor Bolts for Traffic Signals, Lighting and Overhead Signs ............................... 714.09 Grounding Electrodes ................................ ................................ ................................ 752.1 1 Light Pole Foundations ................................ ................................ .............................. 753.01 Transformer Bases ................................ ................................ ................................ .....753.02 Light Poles ................................ ................................ ................................ ................. 753.03 Bracket Arms, Aluminum ................................ ................................ .......................... 753.04(a) Bracket Arms, Steel ................................ ................................ ................................ ...753.04(b) Luminaires ................................ ................................ ................................ ................. 753.05 Highway Illumination Conductor Cable ................................ ................................ ....753.06 Finish of Highway Illumination Components ................................ ............................ 753.07 679.0 3 GENERAL REQUIREMENTS . Street lights shall be installed as specified in the Contract. Street lights shall be designed to withstand a 100 mph wind load with an allowable angular deflection of 70 arc minutes or less. Street lighting design shall conform to the AASHTO Standard Specifications for the Structural Supports for Highway Signs, Luminaires , and Traffic Signals . All wiring shall meet the requirements of the National Electrical Code . 679.0 4 SUBMITTALS . The Contractor shall submit fabrication drawings in accordance with Subsection 105.0 6. The submittal shall contain the following information, at a minimum:
a.Wiring . Conductor material, insulation type, voltage rating , and temperature rating .
b.Light Pole Foundations .
1.Dimensions and material specifications for all hardware used to mount the transformer base to the light pole foundation .
2.For precast light pole foundations, comple te design details and material specifications shall be supplied .
Source: Vermont Standard Specifications for Construction, 2024 Edition. Pages 1106–1125 of 1,380.