SECTION 712: SIGNAL ASSEMBLIES
712.1 Description
This Work consists of provid ing and installing traffic and pede strian signal assemblies on signal poles and attaching base plates and directional louvers to Traffic Signals.
712.2 Materials
712.2.1 Traffic Signal Assembly
The Contractor shall provide standard 12 inch lens size signal faces. The Contractor shall ensure that signal assemblies meet the req uirements of the latest edition of ITE Publication, Adjustable Face Vehicular Traffic Control Signal Heads . T h e Contractor shall provide adjust able, colored light, vertical or horizontal type signal assemblies with the number and type of lights (faces) specified in the Con tract. The Contractor shall ensure that the signal assemblies adjust 360° about a vertical axis. The Contractor shall fabricate signal assemblies, housings, and doors of polycarbonate resin Material. If using polycar bonate resin Material, the Con tractor shall ensure its capability to withstand an impact of 70 lb per foot without fracture or pe rmanent deformation. The Contractor shall design si gnal assemblies to accept mounted back plates.
712.2.1 2 Housing
Signal housing consists of an asse mbly of separate sections wit hout tie rods, substantially secured in a watertight manner to form the number of units required. Each section houses an indi vidual optical unit. The Contractor shall provide a one (1)-piece housing for each s ection made of a polycarbonate resin Material with sides, top, and bottom integr ally molded. The Contractor shall ensure ribbed polycarbonat e housings have at least a mini mum thickness of 0.09 inch. The Contractor shall ensure that the housing passes the ITE win d-load testing. The Contractor shall include a one (1)-piece hinged door in eac h section with mounting LED, watertight gaskets, and a simple corrosion-resistance door -locking device. The Contractor shall mount the LED so that its parts are readily ac cessible or removable. The Contractor shall provide interc hangeable sections constructed f or easy removal or addition. The Contractor shall provide a round opening in the top and bot tom of each head for a 1 1/2 inch supporting pipe frame. The Contractor shall hinge each door and secure to the body of the housing with two (2) stainless steel hinge pins, ey ebolt, washer, and wing nut. The Contractor shall use corrosion- resistance screws and fasteners, where exposed to the elements. The Contractor shall make interior screws and fastener s from zinc-plated brass. The Contractor shall integrally cast or mold a locking boss wit h 72 teeth into the signal housing at both openings. The Contractor shall make the angle of the teeth 90° and the depth of the teeth 0.0468 inch. The Contractor shall ensure that the locking boss provides positive positioning of the entire signal head to eliminate rotation or misalignment. The Contractor shall mount a terminal block in the back of the middle section of the Signal Assembly. At a minimum, the Contractor shall provide a five-position, terminal block for Section 712: Signal Assemblies Page 838 signal assemblies. The Contractor shall attach the signal sect ion leads to the left of each terminal block and leave the opposi te terminals for the field w ires. The Contractor shall provide two (2) coded leads with NEMA quic k-disconnect tabs for wiring from each LED. The Contractor shall connect a white wir e to the shell of the LED and a black or colored wire to the bottom or end terminal of the LED. For identification, the Contractor shall color-code leads with the appropriate red, yel low, or green, (yellow or green tracer for arrow indications). If using black wires, the Contr actor shall permanently mark the terminals to identify the leads where they attach. The Contrac tor shall provide No. 18 AWG size, Type TFF leads.
712.2.1 3 Visors
The Contractor shall provide each signal section with a 12 inch nominal length tunnel visor of 3003-H16 corrosion-resistant aluminum alloy sheet a mi nimum of 0.04 inch thick in accordance with ASTM B 209. The Contractor shall encircle the lens with tunnel visors for 300° with a four (4) inch open slot on the bottom. The Contrac tor shall provide the visor with four (4) twist-on attaching ears for installation to the signal door by four (4) corrosion-resistant screws. The Contractor shall provide the vertical outer face o f the door with four (4) threaded holes equally spaced around the ci rcumference of the lens openi ng and 45° from the horizontal or vertical axis, to a llow vertical or horizontal in stallation of the Signal Assembly.
712.2.1 4 Framework and Mounting Brackets
The Contractor shall provide mounting brackets consisting of as semblies of 1 1/2 inch nominal size Standard steel pipe and malleable iron, ductile ir on, or brass pipe fittings. The Contractor shall securely assemb le members to provide plumb or level support.
712.2.1 5 Finish
When making the Signal Assembly of polycarbonate resin Material , the Contractor shall completely impregnate the required color into the resin Materia l. The Contractor shall not allow scratches that expose uncolored Material. The Contractor shall finish the visor and the outside surfaces of framework and mounting brackets with two (2) coats of best-quality infrared oven-baked paint as follows: 1. Signal housing and door inside and out: 1.1. Signal housing—federal yellow; 1.2. Signal door—flat black; 2. Visor inside and out: 2.1. First coat—baked epon primer, zinc chromate, or equal; 2.2. Second coat—flat black urea baked enamel having zero (0) g lass reflectance. Minimum dry film thickness of 0.001 inch; and 3. Use special finishes for spec ial applications and as specifi ed in the Contract.
712.2.1 6 Geometrically Programmed Louver
712.2.1 6.1 General
The Contractor shall provide a louver with the following featur es: 1. Fit all manufacturers’ 12 inch signal visors; 2. Retrofit into existing 12 inch signal visors; Section 712: Signal Assemblies Page 839 3. Provide a full round ball display, with minimum slat effect, throughout the selected view range; 4. Provide an absolute exact visual cut-off; 5. Allow the view angle within each signal section to be adjust ed to a designated area; 6. Have a minimum glow outside the view range; 7. Allow for controlling either the horizontal or vertical view range within the signal visor; 8. Lightweight (Not to exceed five (5) lbs); and 9. Maintenance free.
712.2.1 6.2 Housing
The housing design shall allow the baffle positions to be chang ed in order to adjust the view angle.
712.2.1 6.3 Baffles
The Contractor shall provide baffles identical in design and in terchangeable within the housing. The plane of each baffle shall be 90° to the centerline axis in the housing.
712.2.1 6.4 Attaching Hardware
The Contractor shall provide six (6) black, self-threading scre ws with each louver assembly for attaching the louver to the signal section.
712.2.1 6.5 Installation Kit
The Contractor shall provide an installation kit suitable to be utilized as an aid in installing the louver assembly.
712.2.1 7 Traffic Signal Assembly (LED)
712.2.1 8 Optical Units
The Contractor shall design light emitting diode signal modules that do not require special tools for installation as retro fit replacements for optical uni ts of Standard Traffic Signal sections. Light emitting diode signal modules must fit into th e existing Traffic Signal section housings, built in accordance with the requirements in the ITE publication ST-008B, Vehicle Traffic Control Signal Heads (VTCSH) without modification. The Contractor shall use terminal block connections in the sign al face. Splices will not be allowed. The Contractor shall integrate the lens of the light emitting d iode signal module with the unit. The Contractor shall fabricate the convex lens, with a s mooth outer surface, from ultraviolet stabiliz ed plastic or glass. The lens is required a minimum exposure of 48 months to direct sunlight (ultraviolet) without deterioration. If a polymeric lens is used, the Contractor shall use a surface coating or chemical surface treatment to provide front surface abrasion resistance. Section 712: Signal Assemblies Page 840 The operating temperatures range for light emitting diode signa l modules are from −104 °F to 165 °F. The Contractor shall protect light emitting diode signal module s against dust and moisture intrusion in accordance with the requirements in NEMA Standard 250-1991 for Type 4 enclosures. The Contractor shall use a singl e, self-contained light emittin g diode signal module not requiring onsite assembly for installation into existing Traffi c Signal housing. The Contractor shall integrate the power supply for the light emitting diode s ignal module into the unit. The Contractor shall manufacture the light emitting diode signa l module assembly to withstand mechanical shock and vibration. The Contractor shall conform the minimum initial luminous inten sity values for light emitting diode signal modules to t he requirements in Section 11 .04 of the VTCSH at 77 °F. The Contractor shall provide light emitting diode signal module s that after 48 months of continuous use over the temperature ranging from −104 °F to 165 °F are at least 85 percent of the Standard light output values specified in the VTCSH . The Contractor shall ensure that the measured chromaticity coor dinates of light emitting diode signal modules are in acco rdance with Section 8.04 and Fi gure 1 of the VTCSH over the temperature ranging from −104 °F to 165 °F. The Contractor shall take luminous intensity measurements over the temperature ranging from −104 °F to 165 °F. The Contractor shall measure color requirements while operating throughout the temperature ranging from −104 °F to 165 °F. The Contractor shall operate light emitting diode signal module s over a voltage range from 120 V AC: 80 V to 135 V, 240 V AC: 184 V to 276 V, 12 V D C : 8 V t o 2 4 V a t a frequency of 60 Hz ± 3 Hz. The Contractor shall prevent percep tible flicker over the specified voltage range using the light emi tting diode circuitry. Voltag e fluctuations shall have no visible effect on the luminous int ensity of the indications. The Contractor shall use wiring and terminal blocks conforming to the requirements in Section 13.02 of the VTCSH . The Contractor shall provide two (2) secured, color coded jacketed wires (600 V, 20 AWG minimum), in accordance with the NEC®, rated for service at least 221 °F for electrical c onnection for each light emitting diode signal module. The Contractor shall include voltage surge protection to withst and high-repetition noise transients in accordance with Section 2.1.6 of NEMA Standard TS 2-1992 for the light emitting diode signal module on-board circuitry. The Contractor shall ensure that light emitting diode signal mo dules are operationally compatible with currently used controller assemblies (solid sta te load switches, flashers, and conflict monitors). The Contractor shall provide and install light emitting diode s ignal modules and associated onboard circuitry in accordance with Federal Communi cations Commission (FCC) regulations concerning the emissi on of electronic noise (47 C.F .R. § 15.101 et seq.). The Contractor shall provide a power factor of at least 0.90 wh ile operating light emitting Section 712: Signal Assemblies Page 841 diode signal modules throughout the te mperature ranging from −1 04 °F to 165 °F. The Contractor shall ensure that light emitting diode signal mo dules are compatible with the controller unit, conflict monitor, and load switch.
712.2.2 Reserved
712.2.3 Reserved
712.2.4 Pedestrian Signal (LED)
The Contractor shall design light emitting diode pedestrian sig nal modules that do not require special tools for installation as retrofit replacements for optical units of Standard pedestrian signal sections. Li ght emitting diode signal module s must fit into the existing pedestrian signal section housings built in accordance with the requirements in the VTCSH without modification. The LED signal module consists o f a double side-by-side message combining the symbols of a hand/walking person and countdown display. The Co ntractor shall arrange the LEDs in a manner to form an outline of the symbols. The shape of the outline must conform to the standard symbols for pedestrian signals. The Contractor shall ensure that the measured chromaticity coor dinates for the “lunar white” walking person and the “portland orange” countdown/hand are in accordance with the VTCSH . The Contractor shall ensure that the chromaticity measuremen ts remain unchanged over the input line voltage range from 120 V AC: 80 V to 135 V , 240 V AC: 184 V to 276 V, 12 V DC: 8 V to 24 V. The Contractor shall distribute the LEDs evenly along the messa ge outline. The Contractor shall not vary the distance between each LED more th an ten percent (10%). The Contractor shall ensure that the hand or walking man symbols ar e at least (H×W) ten
10.inch × 6.5 inch. The Contractor shall ensure that the cou ntdown display is at least six (6) inches high and on black opaque background. The Contractor sha ll interconnect the individual LED light sources to minimize the loss of no more than three (3 ) LEDs or five percent (5%) of the signal light output when a catastrophic failure of single L E D o c c u r s . T h e d i s p l a y f a c e consists solely of LEDs mounted on a black printed circuit boar d mat. The Contractor shall provide an LED signal module that is rated for use in operating temperature ranging from −104 °F to 165 °F. The Contractor sha ll completely seal the LED module against dust and moisture intrusion in accordance with N EMA Standard 250-1991 Section 4.7.2.1 and Section 4.7.3.2 for Type 4 enclosures. The Contractor shall use a single, self-contained LED signal mo dule device not requiring onsite assembly for installation into existing Traffic Signal h ousing. The Contractor shall manufacture the LED signal module assembly to withstand mechani cal shock and vibration from high winds and other sources. The Contractor shall not exceed the maximum rating for DC curre nt recommended by the LED manufacturer used by the driver board to drive the LEDs. T he Contractor shall use the driver board to regulate the LED drive current on both the hand and walking man messages to compensate for line voltage fluctuations over the range of 120 V AC: 80 V to 135 V, 240 V AC: 184 V to 276 V. The Contractor shall ensure that the luminous output does not vary more than ten percent (10%) over the voltage range and tha t it is not perceptible to the human eye. The Contractor shall use drive circuitry that inclu des voltage surge protection to withstand high-repetition noise transients and low-repetition h igh-energy transients in Section 712: Signal Assemblies Page 842 accordance with Section 2.1.6, NEMA Standards TS-2, 1992. The Contractor shall provide onboard circuitry in accordance wi th FCC regulations concerning the emission of electronic noise (47 C.F.R. § 15.101 et seq.). The Contractor shall ensur e compatibility in the circuitry, proper triggering and operation of the load switches, and confl ict monitors in signal controllers currently in use by the procuring traffic authority.
712.2.5 Back Plates
The Contractor shall provide back plates as follows: 1. For signal faces with vehicu lar signal indications, if speci fied in the Contract; 2. Of one (1)-piece aluminum; 3. Of a size that provides a fi ve (5) inch border around the pe rimeter of the signal; and 4. Louvered aluminum.
712.2.6 Directional Louvers
Actual louver angles to be provided in the Contract.
712.3 Construction Requirements
The Contractor shall cover vehi cular Signal Assembly faces afte r installation until the controller and intersection signal s are put into operation. Th e Contractor shall ensure that the covering does not permit any misunderstanding by the general pu blic that the signal is in operation. The Contractor shall make signal faces plumb and adjust them to proper direction. The Contractor shall make faces and frameworks plumb and level, sym metrically arranged, and secure after alignment. The Contractor shall mount overhead mast arm–mounted Traffic Si gnal assemblies horizontally, unless the Contract specifies mounting an overhea d Signal Assembly vertically to a mast arm or span wire. The Contractor shall install back plates and directional louver s on signal assemblies in accordance with the recommendation of the manufacturer.
712.3.1 Warranties and Maintenance
The Contractor shall: 1. Obtain and assign to the Department all manufacturer’s and p roducer’s guarantees or warranties for items and Materials incorporated into the Wor k. If the manufacturer’s or producer’s gua rantee is absent, a guarantee f rom the Contractor is necessary for six (6) months after Acceptance by the Departm ent. Include the following in this guarantee: 1.1 Mechanical and electrical E quipment and Material incorporat ed into the Work are free from any defects or imperfections; 1.2 Repair of any malfunction or defect in any such Equipment o r Material, which develops is at no additional cost to the Department; 2. Supply installation guides and user manuals to the Departmen t for the Equipment incorporated in the Project; and 3. Provide the Department with a Certificate of Compliance from the manufacturer in accordance with the requirements in these Specifications. Incl ude a copy of Section 712: Signal Assemblies Page 843 applicable test reports on the light emitting diode signal and pedestrian modules in the certificate.
712.4 Method of Measurement
The Department will measure signal assemblies, pedestrian signa ls, pedestrian countdown signals, back plates , directional louvers, and pedest rian sound units by the number of sections required and by ty pe specified (if applicable).
712.5 Basis of Payment
Pay Item Pay Unit ____(number) Section Traffic Signal Assembly Each ____(number) Section Optically Programmed Signal Assembly Each ____(number) Section Back plate Each Directional Louver Each Pedestrian Sound Unit Each ____(number) Section Traffic Signal Assembly (LED) Each Pedestrian Signal (LED) Each
712.5.1 Work Included in Payment
The following Work and items will be considered as included in the payment for the main items and will not be measured or paid for separately: 1. All Materials required for a complete installation, includin g hardware and lamps. Section 713: Detectors Page 844
Source: New Mexico Standard Specifications for Highway and Bridge Construction, 2019 Edition. Pages 0–0 of 974.