TRAFFIC SIGNAL HEADS SECTION 1075 745 b. Provide a self -contained module that requires no on -site assembly for installation into an existing traffic signal housing. Equip the module with 2 conductors for connecting to power, a printed circuit board, power supply, lens and one -piece gasket, and seal the unit after installation and connections so that it is weatherproof. Provide a power supply integral to the module.
c.There are no restrictions to any specific LED technology for the module.
d.Equip the module and removable lens with a prominent and permanent vertical indexing indicator, i.e., UP arrow, or the word “UP,” or “TOP” for correct indexing and orientation in the signal housing.
e.Affix a certification label to the back of the module that the module is in conformance with all non-optional requirements of VTCSH -LED or VTCSH -ARROW and the complete ITE standards.
2.Environmental requirements:
a.Provide a module lens capable of withstanding ultraviolet exposure for a minimum period of 60-months without exhibiting significant evidence of deterioration.
3.Optics requirements:
a.Submit the maintained minimum luminous intensity tables for the expanded or extended view modules with the bid proposal. Show, at a minimum, the points corresponding to the intensity tables provided in VTCSH -LED and VTCSH -ARROW.
b.Equip arrow modules with a solid arrow indication in conformance with VTCSH, Chapter 2, Section 9.01 having a 3 line / horizontal bar. Spread the LEDs evenly across the illuminated portion of the arrow area.
4.Lens requirements:
a.Provide an abrasion resistant module lens that has a smooth outer surface to reduce the collection of debris and facilitate cleaning and is made of ultraviolet stabilized polycarbonate or polymeric material.
b.A module lens, tinted or covered by transparent film or materials with similar color and transmissive characteristics is permitted.
c.The lens may be a replaceable part without the need to replace the complete module. Provide a lens that delivers an overall appearance that mimics 1 used with incandescent lamps. Do not use lenses that depict a “honeycomb” effect of the display.
5.Electrical requirements:
a.Equip the module to connect directly to the existing electrical wiring system, with a nominal operating voltage of 120 +/ - 3 VAC RMS. Operate the module using a 60 hertz +/ - 3 hertz AC line power over a voltage range from 80 VAC RMS to 135 VAC RMS. Prev ent flicker of the LED output at frequencies less than 100 hertz over the operating voltage range. Do not allow fluctuations in line voltage over the operating voltage range that affect luminous intensity by more than +/ - 10 percent. Do not allow visible i llumination from the module when the applied voltage is less than 35 VAC RMS.
b.Provide modules that meet the maximum and nominal wattage requirements of “ENERGY STAR Program Requirements for Traffic Signals.” TRAFFIC SIGNAL HEADS SECTION 1075 746 c. Provide wiring and terminal blocks that meet the requirements of VTCSH, Chapter 2, Section
13.02 Provide 2, secured, color coded, 600 volt, jacketed wires, a minimum of 18 AWG and at
least 39 inches in length, conforming to the NFPA 70, NEC, and rated for service at 221 degrees F.
d.Wire the individual LEDs such that a catastrophic failure of 1 LED will result in the loss of not more than 5 percent of the module total light output. Wire the LEDs so that the outage of a single LED will not cause the outage of additional LEDs.
e.Provide modules that are operationally compatible with currently used controller assemblies (solid state load switches, flashers, and conflict monitors).
f.Provide LED signal heads that have operational compatibility with NEMA traffic controller assemblies and meeting the standards set forth in NEMA standards publication TS -2 Traffic Controller Assemblies. Provide LED modules that have operational compatib ility with NEMA TS-1 and TS -2 conflict monitoring parameters.
g.Use the control circuitry to prevent the current flow through the LEDs in the off state to avoid any false indication perceived by the human eye during daylight and evening hours.
h.Provide LED signals fully capable of operating in the flashing mode.
i.A dimming feature is not required. 1075.3 Pedestrian Head LED Modules.
A.Provide LED modules conforming to ITE Pedestrian Traffic Control Signal Indicators: Light Emitting Diode (LED) signal modules, dated February 2011.
B.Establish the size, design, and illumination of pedestrian signal display indications in conformance to the DE MUTCD, and the Standard Highway Signs and Markings, latest edition.
C.Provide each module as a fully encapsulated assembly that uses LEDs as the light source and a message lens. Wire the individual LEDs such that a failure of 1 or more LEDs will result in the loss of light from that LED only and the loss of not more than 1 percent of the module light output. Provide ultra -bright type LEDs rated for 100,000 hours of continuous operation.
D.Display messages in the Portland Orange “upraised hand” (“hand”), the white “walking person” (“person”) and the Portland Orange “numeric countdown” (“countdown”) icons illuminated by multiple configuration LEDs.
E.Provide “hand” and “person” icons each with a minimum of 11 inches in height and 7 inches in width. Provide “countdown” icon with two 7 segment digits, forming the time display, at a height of 9 inches and the overall width of the digit display (both di gits side -by-side) of 7 inches, with 0.5 inches of space between the 2 digits.
F.Include the “hand” and “person” icons on all modules. If using the “countdown” icon in conjunction with the “hand” and the “person” icons, overlay the “hand” and the “person” icons upon each other and locate the overlaid icons to the left of the “countd own” icon. If not using the “countdown” icon arrange the “hand” and “person” icons side -by-side with the “hand” icon to the left of the “person” icon.
G.Electrical requirements: TRAFFIC SIGNAL HEADS SECTION 1075 747 1. Provide a module conforming to the electrical requirements of ITE, Pedestrian Traffic Control Signal Indicators: Light Emitting Diode (LED) signal modules, dated February 2011. Keep power consumption less than or equal to 15 watts for the “hand” icon, 1 0 watts for the “person” icon, and 10 watts for the “countdown” icon at a temperature of 77 degrees F. Keep the individual LED driving current less than 10 milliamps for each icon at a temperature of 77 degrees F.
2.Operate the module using a 60 hertz ± 3 hertz AC line over a voltage ranging from 80 volts to 135 volts, with a nominal operating voltage of 120 ± 3 volts. Do not permit fluctuations in line voltage within the range of 80 volts to 135 volts that affect luminous intensity by more than ± 10 percent. When input voltage is less than 35 volts, equip the module to turn off automatically. Provide a module that has each icon reach 90 percent of their full illumination (turn -on) within 75 milliseconds of the appl ication of the nominal operating voltage. Provide a module that will not be illuminated (turn -off) after 75 milliseconds of the removal of the nominal operating voltage. Equip the module to include voltage surge protection to withstand high -repetition nois e transients and low -repetition high -energy transients as stated in Section 2.1.8 of NEMA Standard TS -2.
3.Provide a module that has a power factor (PF) greater than 0.9, and a total harmonic distortion (THD) less than 20 percent when at a temperature of 77 degrees F.
4.Electromagnetic interference (EMI) meeting Class A emission limits referred to in the Federal Communications Commission (FCC) Title 47, Subpart B, Section 15 regulation.
5.Provide each signal with 1 individual set of wires for electrical connections. Each set must be made of tree secured, color coded (blue, red, white), 36 inches long, 600V, 16 AWG jacketed wires, rated for service at +221 degrees F.
H.Photometric requirements:
1.Provide photometrics conforming to ITE, Pedestrian Traffic Control Signal Indicators: Light Emitting Diode (LED) signal modules, dated February 2011. Provide a minimum luminous intensity for a minimum period of 60 months of 409 footlamberts for the “han d” icon, 642 footlamberts for the “person” icon, and 409 footlamberts for the “countdown” icon. Provide uniformity of the “hand,” “person” and “countdown” luminance to meet a ratio of not more than 1 to 5 between the minimum and maximum luminance values as measured in 1/2 -inch diameter spots.
I.Chromaticity:
1.Ensure the measured chromaticity, coordinating the white “person” and the Portland Orange “hand” and “countdown” icons, is in conformance to the chromaticity requirements of Section 4.2 and Figure 5 of the ITE Pedestrian Traffic Control Signal Indicator s: Light Emitting Diode (LED) Signal Modules, dated February 2011.
2.Ensure the chromaticity measurements remain unchanged over the input line voltage range of 80 VAC to 135 VAC.
J.Flashing requirements:
1.Provide a light source of a flashing “hand” signal indication capable of flashing continuously at a rate of not less than 50 or more than 60 times per minute, with each flash a minimum of 1/2 and a maximum of 2/3 of the total flash cycle.
K.Environmental requirements: TRAFFIC SIGNAL HEADS SECTION 1075 748 1. Protect the module against dust and moisture intrusion per the requirements of MIL -STD-810F Procedure I, Rain and Blowing Rain. Provide a module with an ingress protection (IP) rating of at least 54. The module must also meet all specifications in the o perating temperature range of -40 degrees F to +165 degrees F.
L.Message lens:
1.Provide a message lens made of plastic and has a smooth outer surface. Provide an ultraviolet - stabilized lens capable of withstanding ultraviolet (direct sunlight) exposure for a minimum of 60 months. Provide the message lens with the inside painted in black in all areas except where the desired icons are formed to provide a contrasting background when viewed from the outside.
M.Installation requirements:
1.Provide a module capable of replacing the existing optical components or signal module in a signal housing or by a complete replacement of the signal head. If installation of a module is into an existing housing, install module without the use of specia l tools and with connection made directly to the existing electrical wiring system. 1075.4 Module Identification and Marking Tag.
A.Permanently mark on the backside of LED traffic signal modules and pedestrian head LED modules the manufacturer’s name, trademark (if applicable), date code, operating characteristics, part/model number, and serial number. Include with the operating cha racteristics, the nominal operating voltage and stabilized power consumption, in watts and volt -amperes.
B.Securely install a tag on each LED module indicating the prime contractor, contract number, module supplier, date of purchase, and date of installation. 1075.5 Quality Acceptance.
A.Manufacture LED traffic signal modules and pedestrian head LED modules in accordance with a qualified ISO 9001, latest edition vendor quality assurance program. Test each module for minimum maintained luminous intensity for expended or extended viewing angle products, in addition to tests specified in the ITE VTCSH – Part 3: Light Emitting Diode (LED) Vehicle Arrow Signal Modules, LED Quality Assurance Program. Failure of each supplied module to meet requirements of all these tests will be cause for reje ction of the modules. 1075.6 Certification of Compliance.
A.Provide, upon request, a certificate of compliance from the manufacturer certifying that the modules comply with the requirements of these specifications. Include a copy of all applicable test reports performed on the modules with the certificate. Provi de a list of module serial numbers with each shipment and provide this information upon receipt of shipment by the Department’s Signal Construction Section, 14 Sign Shop Road, Dover, DE 19901. 1075.7 Warranty.
A.Replace, free of charge, any part or component that fails in any manner by reasons of defective material, design, or workmanship within a period of 5 years from the date of payment for the article. Renew the warranty for each part or component for anoth er 5 years from the date of replacement of the article. Consider the entire module failed if it exhibits light output degradation that falls below the minimum intensity level as outlined in this specification. TRAFFIC SIGNAL HEADS SECTION 1075 749 B. Supply a certificate of warranty from the manufacturer with the bid documents. 1075.8 Manuals.
A.Supply a complete set of documentation that includes parts lists, operation details, maintenance schedules, and other information needed to install and operate the article. 1075.9 Signal Backplates.
A.Provide backplates with a flat, dull black (Federal Standard color number 595B -37038) Powder Coated Aluminum , polycarbonate, or ABS plastic with a minimum thickness of 1/8 -inches and securely mounted on the signal housing. Mount backplates to traffic signal faces using stainless - steel self -tapping screws.
B.Manufacture signal head backplates for use with standard signal head assemblies, and compatible with the signal heads being backplated as to require no modifications to the backplate , to the dimensions of backplates in accordance with the contract. The backplate must be wide enough to extend all around the entire signal head assembly, 5 -inches minimum at the widest portion of the signal head assembly.
C.Provide a minimum 2-inch -wide retroreflective yellow weather resistant prismatic sheeting tape border, comprised of ASTM D4956, Type XI (minimum) retroreflective sheeting around the entire perimeter of the backplate. The temperature rating for the backplate shall be -35 degrees F to 165 degrees F and the retroreflective tape shall not separate from the backplate within this temperature range.
1075.10 Signal Head Housings.
A.Supply the adjustable traffic signal heads in yellow (federal standard color number 595B -13538) with a black face conforming to federal standard color number 595B -17038.
B.Provide signal head housings, die cast of corrosion resistant aluminum alloy per ASTM B 85, alloy 12A with full 12 percent silicon.
C.Clean all interior and exterior surfaces of the housing, housing door, and visor and treat with a chromate aluminum oxide coating process per MIL -DTL-5541. Provide a finish coat using an oven bake.
D.Enamel in conformance with Master Painters Institute’s Reference #9 and #94 or an epoxy powder coating at least 2.0 -mils thick in conformance with ASTM B117 after 500 -hours of salt spray test and have 50 percent gloss retention after 1,000 hours of weather meter test. Use 18 -8 Type 304 stainless steel for all straight pins, wing nuts, washers, and bolts.
E.Design each 8-inch signal section housing to accommodate 8 -inch nominal dimension incandescent reflector assemblies or LED modules. Design each 12-inch signal section housing to accommodate 12 -inch nominal dimension incandescent reflector assemblies or LED modules. Provide a housing of each signal section consisting of a one -piece corrosion resistant aluminum alloy die -casting with front, side, top, and bottom integrally cast, with all parts cle an, smooth and free from flaws, cracking, blowholes, or othe r imperfections. Provide a housing of substantial thickness and ribbed so as to produce the strongest possible assembly consistent with light weight. Equip the housing with internal bosses for the mounting of terminal strip facilities.
Source: Delaware Standard Specifications for Road and Bridge Construction, 2025 Edition. Pages 755–759 of 779.