831.02 Traffic Signal Heads
830.06 Basis of Payment
The Department will pay for each pay item at the contract unit price per the specified pay unit as follows: Pay Item: Pay Unit: PEDESTRIAN PUSH BUTTON Each The Department will consider the cost of signs and hardware to be included in the contract unit price for Pedestrian Push Button .
831.01 Description
This work consists of providing and installing vehicular and pedestrian traffic signal heads and lamps on supports.
831.02 Materials
Provide vehicular traffic signal heads and component parts that consist of polycarbonate or die -cast aluminum in accordance with the ITE Standard for Adjustable Face Vehicle Traffic Control Signal Heads (VTCSH). Provide pedestrian traffic signal heads in accordance with the ITE Standard Adjustable Face Pedestrian Signal Head Standard. Provide LED lamps in accordance with the ITE Standard for Vehic le Traffic Control Signal Heads, unless otherwise shown on the Plans. Provide LED colors in accordance with the chromaticity requirements of the VTCSH standard, Section 8.04 and Figure 1. Provide LED lamps approved by the Department's Traffic Engineering Division or listed on the Department's Traffic Engineering Division Qualified Products List. Ensure pedestrian symbols are fully illuminated LEDs. The Department will not allow outline symbols. Provide pedestrian countdown if shown on the Plans. Provid e incandescent lamps in accordance with the ITE Standard for Traffic Si gnal Lamp if shown on the Plans . For 8 in [200 mm] vehicular traffic signal heads or 12 in [300 mm] pedestrian traffic signal heads, provide 60 W, 590 lm, 120 V, clear traffic signal i ncandescent lamps with a life rating of at least 8,000 hr. For 12 in [300 mm] vehicular traffic signal heads or 20 in [508 mm] pedestrian traffic signal heads, provide 150 W, 1,950 lm, 130 V, clear traffic signal incandescent lamps with a life rating of a t least 8,000 hr. Provide glass lenses and specular alzak aluminum reflectors in traffic signal heads with incandescent lamps. If the Contract requires polycarbonate traffic signal housings, provide ultraviolet stabilized, pre -colored opaque yellow and in jection -molded housings with black doors and visors, unless otherwise shown on the Plans. Apply three coats of paint, inside and outside, to die cast aluminum doors, visors, and signal housings before assembly. TRAFFIC SIGNAL HEADS 831.06
A.First Coat – Primer Ensure the first coat consists of oxide baking primer in accordance with the performance specifications of Federal Specifications TT -P-636.
B.Second Coat – Grey Enamel Ensure the second coat consists of medium grey alkyd urea exterior baking enamel in accordance with Federal S pecifications TT -E-489.
C.Third Coat – Yellow Enamel Ensure the third coat consists of highway yellow alkyd urea exterior synthetic baking enamel, with minimum gloss reflectance in accordance with the performance specifications of Federal Specifications TT-E-489, Enamel Heat Resisting Glyceryl Phthalate, Type 4, Instrument Black.
831.03 Equipment — Vacant
831.04 Construction Methods
Make signal heads weather -tight. Ensure signal heads consist of at least one adjustable signal section with LED or lamps fastened together. Ensure each signal section is self -contained and consists of an optical unit with housing, housing door, visor, and glass lenses, unless otherwise shown on the Plans. Provide signal heads with brackets and fittings for mounting on the t ype of signal support shown on the Plans. Ensure signal heads capable of positioning to control the movement of one direction of vehicular or pedestrian traffic.
831.05 Method of Measuremen T — Vacant
831.06 Basis of Payment
The Department will pay for eac h pay item at the contract unit price per the specified pay unit as follows: Pay Item: Pay Unit: TRAFFIC SIGNAL HEADS Each The Department will consider the cost of lamps, wiring, visors, and hardware to be included in the contract unit price for Traffic Signal Heads .
832.02 Optically -Programmed Adjustable Traffic Signal Heads
SECTION 832 OPTICALLY -PROGRAMMED ADJUSTABLE TRAFFIC SIGNAL HEADS
832.01 Description
This work consists of providing and installing optically -programmed adjustable t raffic signal heads and lamps on supports.
832.02 Materials
Provide optically -programmed adjustable traffic signals capable of allowing optical determination of the visibility zone of the indication. Ensure the signal does not require hoods or louvers. P rovide for projected indications selectively visible or veiled within 15° of the optical axis. Ensure the indications emanate from a single section. Ensure external illumination does not provide indications. Prevent one light unit from illuminating a se cond unit.
A.Optical System Provide a lamp with the following characteristics: 75 W, 120 V (AC), Three prong, Sealed beam, With an integral reflector with stippled cover, and With an average life rating of at least 6,000 hr. Provide a lamp collar, includi ng specular inner surface, that couples the lamp to the diffusing element. The diffusing element may be discrete or integral with the convex surface of the optical limiter. Provide an optical limiter made of heat -resistant glass with an accessible imaging surface at focus on the optical axis for objects from 900 ft to 1,200 ft [275 m to 365 m] away. Provide an optical limiter that allows the application of a veiling mask, determined by the desired visibility zone. Provide a high resolution planar incremental lens for the objective lens; hermetica lly sealed within a flat lamina te of weather resistant acrylic or an equivalent approved by the Resident Engineer. Ensure the lens has a symmetrical outline and can rotate 90° about the axis without displa cing the primary image. Provide an optical system that accommodates projection from a single section of diverse selected indicia to separate portions of the roadway so one indication is visible at a time. Provide the projected indication in accordance wit h ITE chromaticity standards.
B.Electrical Provide a separately accessible housing and integral lamp support for the lamp fixture, with indexed ceramic socket, and self -aligning, quick release lamp retainer. Electrically connect the case
Source: Oklahoma Standard Specifications for Highway Construction, 2019 Edition. Pages 862–863 of 935.