643Traffic Signals

643.01 Description This work shall consist of furnishing and installing all equipment

necessary for the erection and operation of a traffic signal, including traffic signal structures, flashing beacon, temporary traffic signal or modification of a traffic signal, all in reasonably close conformity with the plans.

643.02 General All equipment shall be new unless otherwise specified. Requests for

substitution of any specified material shall be submitted in writing with all documentation (specifications, mill certifications, etc.) in order to enable the Department to evaluate the proposal. Substitutes for specified material may be accepted upon approval by the Fabrication Engineer. Functionally, any substitute shall give equal or better service than the specified material. Existing signal equipment to be used shall be cleaned, repainted, and reconditioned as noted on the plans. All equipment, installation of equipment and other incidental work shall conform to the latest applicable provisions of: NEC, MUTCD, NESC, NEMA, and the ITE Standards for traffic control equipment. All work shall be done to the satisfaction of the Resident. The meaning of specific terms shall be as defined in MUTCD, NESC, and the ITE Standards for traffic control equipment. 643.021 Materials Material shall meet the requirements specified in the following Sections of Division 700 - Materials: Steel Conduit 715.02 Non-metallic Conduit 715.03 Prewired Conduit 715.04 Metallic Junction and Fuse Box 715.05 Secondary Wiring 715.07 Vehicular Signal Indications 718.01 Pedestrian Signal Indications 718.02 S i g n a l M o u n t i n g 718.03 Vehicular Loop Detectors 718.04 M i c r o w a v e D e t e c t o r s 718.05 6-122 P e d e s t r i a n D e t e c t o r s 718.06 C o n t r o l l e r s 718.07 C o n t r o l l e r C a b i n e t 718.08 F l a s h e r 718.09 P r o g r a m S e l e c t i o n 718.10 Contacts and Relays 718.11 Conductors 718.12 Aluminum Supports 720.01 Aluminum Mast Arm and Bracket Arm 720.02 Steel Supports 720.03 Steel Mast Arm and Bracket Arm 720.04 A n c h o r B o l t s 720.07 Wood Utility Pole 720.10 643.022 Paint Aluminum paint shall conform to AASHTO M69, Type II. Green or yellow enamel paint, as indicated on the plans, shall meet or exceed the latest Federal Specification TT-E-489. The color shall match Federal Color Standard Number 14062. 643.023 Traffic Signal Structures The design, materials and fabrication of Traffic Signal Structures shall meet the requirements of the current edition of AASHTO “LRFD Specifications for Structural Supports for Highway Signs, Luminaires, and Traffic Signals” and interims thereto, as noted below except as otherwise indicated within these specifications or on the plans. All poles and mast arms shall be designed using the following criteria:  Basic wind speeds based on a 700-year mean recurrence interval  K z as specified in Table C3.8.4-1 (Height and Exposure Factors)  Kd as specified in Table 3.8.5-1 (Directionality Factors)  G as 1.14, minimum (Gust Factor)  Cd as specified in Table 3.8.7-1 (Wind Drag Coefficients)  Deflection requirements as specified in Section 10.4 Traffic signal support structures shall be classified as Fatigue Category III if they are located on roads with a speed limit of 35 mph or less, Fatigue Category II if they are located on roads with a speed limit of greater than 35 mph, and Fatigue Category I if noted on the Contract Plans. Fatigue Importance Factors shall be as specified in Table 11.6-1 (Fatigue Importance Factors). All Traffic Signal Structures with mast or bracket arms shall be equipped with an approved damping or energy-absorbing device. After execution of the contract and before any shop work is commenced, the Contractor shall submit for approval the manufacturer's drawings, including design computations and fatigue computations, of all Traffic Signal Structures proposed to be furnished and erected under this Contract. The drawings shall be of sufficient detail to indicate material and 6-123 dimensional conformance with these specifications and the plans. Each drawing shall contain a reference to the design criteria and a certification that the design criteria have been met for the Traffic Signal Structures, including poles, mast arms and associated hardware and fittings, as submitted. The certification shall be signed by a Professional Engineer licensed in accordance with State of Maine regulations under their official seal. It is the intent of these specifications that the Contractor shall be fully responsible for the adequacy of the sizes, wall thicknesses, materials and connections of the Traffic Signal Structures, including poles, mast arms and associated hardware and fittings. Approval of the drawings by the Fabrication Engineer will signify only approval of the materials, mounting height(s) and mast arm length(s). Approval of deviations from the plans and/or specifications shall be requested in writing and approved by the Fabrication Engineer before being incorporated in the manufacturer's drawings. The Contractor shall furnish and install all electrical fittings, pipe, switches, fuses, and such other material necessary to install the equipment properly and securely. All equipment shall conform to the applicable code and be of first-class workmanship. All electrical fittings shall be complete with weatherproof gaskets. A Certificate of Compliance shall be provided for all applicable materials noted in Section 634.021 – Materials, in accordance with the requirements of the General Statement of Division 700 Materials. Shop certification in accordance with Section 504.04 is required. 643.024 Miscellaneous Materials Span wire shall be minimum 5/16 inch diameter, minimum, 7 strand, extra-high strength, galvanized steel wire. Anchors shall be power installed and sized according to strain and soil conditions. All hardware, such as strand vise feed-thru dead ends, preforming guy grip dead ends and angle thimble-eye bolts, shall be standard pole line hardware. Guying of poles shall meet the requirements of Grade "B" Construction as defined in the NESC. Guys shall be installed in line with the direction of pull. Anchors shall be power installed so that the centerline of the anchor rod will be within 10° of the line of the guy wire. The holding capacity of the anchor shall be 1.25 times the calculated load on the guy wire. Guy wires shall be utility grade and the maximum working stress shall not exceed half of the maximum ultimate tensile strength of utility grade guy strand. Where bedrock is encountered, rock anchors shall be used. Pipe standoffs for sidewalk anchors shall be galvanized steel pipe sized according to the offset distance from anchor to pole and shall be fitted with standard guying hardware. Messenger wire shall be ¼ inch diameter, 7 strand, extra-high strength, galvanized steel wire, unless otherwise specified. 6-124 LED lamps shall have a regulated power supply designed to electrically protect the diodes. The lamp shall be watertight and sealed to eliminate contaminants. The lamps shall be capable of operating at ambient air temperatures of -40°F to 140°F. Lamp life shall be a minimum of 100,000 hours of continuous operation. They shall be manufactured using the Allen Gap Technology. Power consumption for 12 inch indications including power supply shall not exceed 20w.

643.03 General Installation details will be shown on the plans and/or specifications. The

location shown for all equipment and vehicle detectors is approximate; final locations will be determined in the field. During installation, all heads installed but not operating shall be covered or otherwise concealed from view. The requirements of certain Sections of this specification may be waived for temporary traffic signals and traffic signal modifications, if so noted on the plans.

643.04 Poles Wood poles shall be placed in the ground to a depth of 20% of their

overall length, with a maximum deviation from the vertical of ¼ inch in 5 feet. After each wood pole has been set in the ground and plumbed, the space around the pole shall be backfilled with selected earth or sand, free of rocks and other deleterious material, placed in layers approximately 4 inches thick. Each layer shall be moistened and thoroughly compacted. Traffic Signal Structures shall be erected in a vertical position, with a maximum deviation from the vertical of ¼ inch in 5 feet using the leveling nuts provided with the anchor bolts. Once the poles have been plumbed, the top nuts shall be tightened by bringing the nut to a snug tight condition using the full effort of a worker using a spud wrench or compatible tool. After all nuts have been brought to a snug, tight condition, each nut shall be tightened an additional one-third turn, using an impact wrench, torque wrench or large crescent wrench. A minimum of two full threads shall project beyond the outside face of the nut. Nuts and bolts, other than anchor bolts, shall also be tightened by the above procedure. When foundations and anchor bolts have been installed by others, the Contractor shall verify the anchor bolt dimensions at each location so that bases will be furnished with properly located and sized bolt holes. Wires in poles shall be supported with a Kellum-type, braided, strain-relief grip attached to a "J" hook mounted inside the pole near the top. 643.041 Foundations Foundations for Traffic Signal Structures shall meet the requirements of Section 626 – Foundations, Conduit, and Junction Boxes for Highway Lighting, Traffic Signals, and Highway Lighting. 6-125

643.05 Loop Detector and Loop Detector Wire Installation The detector unit shall be

located in the controller. No more than four loops shall be connected to a single detector amplifier. Detectors shall be installed according to the manufacturer's recommendation, subject to approval. Each detector shall be supplied complete with comprehensive installation instructions. The pavement slot for wire shall be 2 to 3 inches below the finished surface and not closer than 18 inches from the edge of pavement or the curb. The right-angle corners of the pavement slot shall be chamfered to eliminate sharp bends in the loop wires. Loop detector wire shall be number 14 or number 12 AWG copper conductors drawn through vinyl plastic tubing approximately ¼ inch in diameter. All pulse loop "approach" wiring shall be insulated red and shall be permanently marked "A", "B", "C", or "D", according to the "approach" guidelines in the controller cabinet. All pulse loop "presence" wiring shall be insulated black and shall be permanently marked according to the "presence" guidelines in the controller cabinet. All loop lead-ins shall be of the same conductor with no splicing. The lead-in from the amplifier to the beginning of the loop shall be shielded pairs, as shown on the plans. All debris and moisture shall be removed from the loop pavement slot before installation of loop wires. The pavement slot shall be filled to the road surface with an approved sealing compound to form a waterproof bond with the pavement after installing the wire loop. Detector conductors shall not be housed in the same jacket as the signal conductors.

643.06 Microwave Detector Installation The microwave detector shall be installed in

accordance with the manufacturer's recommendations. A four-conductor wire shall be installed from the microwave unit to the controller. All angles and adjustment of patterns shall be the responsibility of the Contractor. The detectors shall operate in either pulse or presence mode.

643.07 Span Wire, Messenger Wire, and Guy Wire All span wire, messenger wire, and

guy wire installations shall be in conformance with the requirements of the Utility Companies, when installed on Utility Facilities. All span wire hanging traffic signals permanent or temporary will have a bottom tether wire to prevent the signal from excessive swinging All span wires, messenger wires, guy wires, terminal boxes, controller cabinets, or any other metallic surface that might be contacted by people, shall be bonded to ground. All sidewalk guy wires and slant guy wires installed in a sidewalk area shall be equipped with full-round or half-round guy guards.

643.08 Conduit All conductors under roadways from the controller to the mast arm

poles shall be 3 inch schedule 80 PVC. 6-126

643.09 Service Connection The Contractor shall furnish and install the necessary

electrical service as directed by the Utility Company. The Contractor shall make all arrangements for the service connection and be responsible for all charges incurred thereby. Under no condition shall any equipment, except that shown on the plans, be installed on any Utility Facilities. Traffic signal services shall have an automatic transfer switch such as a GENERLINK model MA23/24 – S installed, this will be required on traffic signals only not beacons or dynamic signs. Whenever a service connection is to be made, the Contractor shall contact the Utility Company involved and inform them of the location, pole number, and time proposed for the service connection. The traffic cabinet shall be marked with: An appropriate arc flash plaque or decal with the following information Flash hazard boundary Cal/cm2 hazard at 18 inches PPE level Shock hazard when cover is off Limited approach boundary Restricted approach boundary The prohibited approach boundary This shall be located on the outside of the equipment and shall be visible, weatherproof, and fade resistant, and not easily removed. The Contractor shall be responsible for all outstanding bills for preliminary work done by the Utility Company during the installation of the traffic signal system, to facilitate the service connection. A service ground rod shall be installed if the service meter trim is not grounded. A total of 4, 10’ service ground rods shall be installed and properly connected together in the cabinet foundation.. The Contractor shall be responsible for grounding the system to 5 ohms or less tested without an electrical connection to the utility neutral or ground conductor. The grounding shall be performed using a ground meter with reference grounds. In the event that a 5-ohm reading is not achieved, the Contractor shall install a chem-rod grounding electrode in close proximity to the cabinet. The chem-rod shall be properly connected to the four rod, grounding system in the cabinet. The chem-rod shall consist of a 10’ copper rod (vertical or horizontal orientation) filled with common salt and desiccant, back filled with natural earth 6-127 bentonite clay ground enhancement material. The chem rod shall be installed per manufacturer’s instructions. The location and orientation for the chem-rod installation shall be approved by the Resident. All testing shall be done in the presence of the Resident. All meter mounting devices shall be installed so that the meters will be upright (plumb). They shall be installed with the top of the meter not less than 48 inches nor more than 60 inches from the floor to the final grade. Exceptions to this height requirement will be made where special permission has been given to install group or modular metering, overall metering enclosures, or pole-mounted meters. Level grade shall be maintained for a minimum of 3 feet in front of the meter enclosure to provide a safe working space. In order to meet this requirement on uneven terrain, as an option, the Contractor may install a pressure-treated wood platform. For any non-residential (industrial or commercial) self-contained meter socket the by- pass requirements are single phase, 100 or 150 amp, single handle lever operated. The Contractor shall meet all requirements and regulations of Utility Companies when installing equipment on their poles and for the service connection. It is the responsibility of the Contractor to contact the appropriate Utility to determine their specific requirements.

643.10 Wiring The Contractor shall furnish and install sufficient cable and wire to

operate the system properly as shown on the plans and as directed. The following color code shall be used where possible: R e d W i r e R e d, artery O r a n g e W i r e Y e l l o w , a r t e r y G r e e n W i r e R e d, side street Orange with Tracer Y e l l o w , s i d e s t r e e t Green with Tracer G r e e n, side street White and white with tracer Common for all signals and bond B l u e A l l s t e a dy burning arrows Blue with Tracer I n t e r m ittent arrows R e m a i n i n g D e t e c t o r s and pedestrian signals The white wire and white wire with tracer shall be used for all common connections and it shall be continuously connected to ground at the controller. There shall be no wire splices. Connections shall be made on a terminal board inside a watertight galvanized steel or aluminum junction box or in an aerial terminal enclosure with protective cover rated for 600 volts. Spade type copper terminal ends shall be used to attach all conductors to terminals. All exposed metal parts, including service conduit and the controller cabinet shall be bonded and grounded. 6-128 Not more than 3 conductors shall be brought to any one terminal. Terminals shall be mounted to face the cabinet door. The number and size of conductors required in each cable will be indicated on the plans.

643.11 Vertical Clearance Unless otherwise specified on the plans and/or specifications,

vertical clearances for vehicular and pedestrian heads shall be in conformity with the MUTCD. All clearances shall be uniform among each type of head or mounting scheme. Clearance for span wire mounted flashing beacon heads shall be a minimum of 17 feet and a maximum of 18 feet.

643.12 Painting Unless otherwise indicated, all exterior parts of the following

equipment shall be delivered to the project finished with green or yellow enamel: Vehicular Signal Heads Pedestrian Signal Heads Pedestrian Push Button Detectors The outside of the steel controller cabinet shall be painted with aluminum paint. The Contractor shall apply one coat of green enamel to all existing equipment designated on the plans to be painted. The Contractor shall touch up all scratches on exposed surfaces of new equipment with matching enamel after the equipment has been installed. All exposed signal parts to be painted shall be cleaned and shall be dry when the paint is applied. No painting shall be done in damp weather nor when the air temperature is below 40°F, unless otherwise permitted. The Contractor shall identify recently painted equipment with "Wet Paint" signs, and shall be responsible for all claims for damages resulting from contact with wet paint surfaces.

643.13 Power Factor In the event that the equipment is of such design that the power

factor is reduced below the requirement of the Utility Company, the Contractor shall furnish and install, without further charge, all equipment necessary to restore the power factor to a satisfactory percentage. Such equipment shall be accessible and shall not be mounted on the Utility Facilities.

643.14 Field Tests Before acceptance of the work, the Contractor shall conduct the

following tests on all traffic signal equipment and circuits, by a licensed electrician. The tests do not need to be performed in the presence of the Resident, but the test results shall be recorded on the Traffic Signal Quality Control Check List and submitted to the Resident by the Contractor for acceptance. The form shall be signed by the licensed electrician certifying that the signal equipment and circuits meet the requirements of section 634.14. 6-129

643.15 Timing The controller shall be timed as noted on the plans. The Contractor shall

notify the Resident, at least 1 week in advance, of their intention to initially operate the signals. At the time of initial operation of the new signals, the Contractor shall provide police protection from the local police department at the Contractor's expense until the Contractor demonstrates to the Resident that the signal operates in conformance with this specification. 6-130

643.16 Final Cleaning Up After all work has been completed, the Contractor shall

remove all barriers, "Wet Paint" signs, equipment and all debris which has accumulated during the work. Unless otherwise specified in the plans, the Contractor shall remove and deliver all unused signal equipment and wiring to the State of Maine, Department of Transportation, as directed by the Resident. The Contractor shall notify the State Traffic Engineer (207-624- 3620) as to time and date of such delivery. (Deliveries will be accepted Monday through Friday between the hours of 7:00 A.M. and 4:00 P.M. only.) Notification shall precede delivery by a minimum of 24 hours.

643.17 Documents The Contractor shall furnish two operation and maintenance

manuals for all controller units, auxiliary equipment, vehicle detector sensor units, control units, and amplifiers. Documents shall be delivered with the controller at the time of testing. Each manual must include, but need not be limited to the following:

643.18 Method of Measurement Traffic signals, traffic signal modifications,

interconnect wire, video detection system, traffic signal control system, and flashing beacons will each be measured for payment by the lump sum in place. Temporary traffic signals will be measured for payment by the lump sum, satisfactorily installed, operated, and removed. Pedestal poles, strain poles, combination poles, and mast arm poles with mast arms will be measured by each unit. Each loop detector installed, connected to appropriate phases in the controller cabinet, complete and operational will be measured by the unit. 6-131 Excavation in solid ledge rock for replacement of wood poles will be measured by the cubic yard. The depth of measurement will be to the bottom of the pole, and the diameter of measurement will be the pole diameter plus 30 inches.

643.19 Basis of Payment Traffic signal modifications, traffic signals, interconnect wire

and flashing beacons will be paid for at the contract lump sum price, which payment will be full compensation for furnishing and installing all materials, both new and reused, including, but not limited to wood poles, span wire, tether wires, backplates, visors, guys, controllers, vehicular heads, pedestrian heads, flashing beacons, wiring, cable, pole risers, LED lamps, and all appurtenances and incidentals, including design of the Traffic Signal Structures, required for a complete functioning installation and for furnishing all tools and labor necessary for completing the installation. Conduits, junction boxes, and foundations will be paid for under Section 626. Pedestal poles, strain poles, combination poles and mast arm poles with mast arms will be paid for at the contract unit price each which payment shall be full compensation for furnishing and installing all materials, tools and labor necessary to erect the poles. Payment for temporary traffic signals shall include compensation for the removal of the system upon completion of the work. All materials used for temporary traffic signals will remain the property of the Contractor. Operating the controller by hand will be paid for under Section 629. Payment will be made for each Loop Detector at contract price, which will be full compensation for materials, labor, and equipment for each loop installed and fully operational. Traffic signal control system will be paid for at the contract lump sum price, which payment will be full compensation for furnishing and installing all materials, including, but not limited to local intersection traffic signal controller, controller cabinets, on-street master controller, supervisory PC software, and all appurtenances and incidentals required for a complete functioning installation. Video detection system will be paid for at the contract lump sum price, which payment will be full compensation for furnishing and installing all materials, including, but not limited to video processing unit, video cameras, supervisory PC software, and all appurtenances and incidentals required for a complete functioning installation. Payment for excavation of solid bedrock for the placement of wood poles will be made under Item 206.07. Payment will be made under: P a y I t e m P a y U n i t 6-132

643.60 Flashing Beacon at: L u m p S u m

643.71 Traffic Signal Modification: Lump Sum

643.72 Temporary Traffic Signal: Lump Sum

643.80 Traffic Signals at: L u m p S u m

643.81 Traffic Signal Control System Lump Sum

643.83 Video Detection System L u m p S u m

643.86 Traffic Signal Loop Detector Each

643.90 Interconnect Wire Between: Lump Sum

643.91 Mast Arm Pole E a c h

643.92 Pedestal Pole E a c h

643.93 Strain Pole E a c h

643.94 Dual Purpose Pole E a c h

Traffic Signals in other states

• Alabama 730 · TRAFFIC SIGNALS
• Connecticut 11.05 · Traffic Signals
• Indiana 805 · TRAFFIC SIGNALS
• Louisiana 1020 · Traffic Signals
• Michigan 820 · Traffic Signals
• Missouri 902 · Traffic Signals
• New Hampshire 616 · TRAFFIC SIGNALS
• New Jersey 702 · Traffic Signals