643TRAFFIC SIGNALS

642.12 Wooden Steps Each

642.15 Precast Concrete Steps Each

642.17 Cast-in-place Concrete Steps C u b i c Y a r d

SECTION 643 - TRAFFIC SIGNALS

643.01 Description This work shall consist of furnishing and i nstalling all equipment

necessary for the erection a nd operation of a traffic signal, i ncluding 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 spe cified. Requests for

substitution of any specified material shall be submitted in wr iting with all documentation (specifications, mill certifications, etc.) in order to enable the Department to evaluate the proposal. Substitutes for specified material may be accepted u pon 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, installati on of equipment and other incidental work shall conform to the latest applicable provisio ns 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 sh all be as defined in MUTCD, NESC, and the ITE Standards for traffic control equipment. 643.021 Materials Material shall meet the requirements specifi ed 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 e xceed the latest Federal Specification TT-E-489. The color shall match Federal Color St andard Number 14062. 643.023 Traffic Signal Structures The design, materials and fa brication of Traffic Signal Structures shall meet the requirements of the current edition o f AASHTO “LRFD Specifications for Structural Supports for Highway Signs, Lumin aires, and Traffic Signals” and interims thereto, as noted below except as otherwise indica ted within these specifications or on the plans. All poles and mast arms shall be designed using the following c riteria:  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 Fatigu e 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 specifi ed in Table 11.6-1 (Fatigue Importance Factors). All Traffic Signal Structures with mast or bracket arms shall b e equipped with an approved damping or energy-absorbing device. After execution of the contract and before any shop work is com menced, the Contractor shall submit for approval the manufacturer's drawings, includin g design computations and fatigue computations, of all Tra ffic Signal Structures proposed to be furnished and erected under this Contract. The drawings shall be of sufficient detai l 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 ar ms 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 th eir official seal. It is the intent of these specifications that the Contractor sh all be fully responsible for the adequacy of the sizes, wall thicknesses, materials and connecti ons 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 reque sted in writing and approved by th e Fabrication Engineer before being incorporated in the manufacturer's drawings. The Contractor shall furnish and install all electrical fitting s, 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 work manship. All electrical fittings shall be complete with weatherproof gaskets. A Certificate of Compliance shall be provided for all applicabl e materials noted in Section 634.021 – Materials, in accordance with the requirement s of the General Statement of Division 700 Materials. Shop certification in accordance wi th 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. A ll hardware, such as strand vise feed-thru dead ends, preforming guy grip dead ends and angle th imble-eye bolts, shall be standard pole line hardware. Guying of poles shall meet the requirements of Grade "B" Constr uction as defined in the NESC. Guys shall be installed in line with the direction of pu ll. Anchors shall be power installed so that the centerline of the anchor rod will be with in 10° of the line of the guy wire. The holding capacity of the anchor shall be 1.25 times t he 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 s trand. Where bedrock is encountered, rock anchors shall be used. Pipe standoffs for sidewalk anchors shall be galvanized steel p ipe sized according to the offset distance from anchor to pole and shall be fitted with st andard guying hardware. Messenger wire shall be ¼ inch diameter, 7 strand, extra-high s trength, galvanized steel wire, unless otherwise specified.