Art. 1084.01 Illuminated Sign SECTION 1084. ILLUMINATED SIGN
1084.01 Illuminated Sign. The illuminated sign shall be as follows.
a.Housing. The sign housing shall be made of extruded aluminum alloy with a minimum thickness of 0.063 in. (1.5 mm). All corners and seams shall be heli-arc welded and weatherproof. Doors shall be made of 0.125 in. (3.1 mm) thick extruded aluminum with a 0.188 x 1 in. (5 x 25 mm) neoprene gasket and sun hood. Hinges shall be continuous full-length stainless steel. Drainage shall be provided by four drain holes at the corners of the housing. The housing shall have stainless steel hardware and provide tool free access to the interior. The exterior surface of the housing shall be acid-etched and shop painted with one coat of zinc-chromate primer and two coats of yellow enamel. The painting shall be according to Section 851.
b.Sign Display. The lens panel shall be 0.125 in. (3.1 mm) ±10 percent in thickness and shall be made of Plexiglas or other plastic material with equivalent or better weathering, structural, and optical properties. Colors and size of the legend, background, and letters used in the legend shall conform to the MUTCD. Turn prohibition signs shall be according to MUTCD “R3-1” or “R3-2”. When illuminated, the message shall be legible and highly visible within a 15 degree cone centered about the optic axis under any ambient light condition. When the sign is not illuminated, the sign display shall blank-out such that no symbol can be seen under any ambient light condition.
c.Illumination. Illumination for the sign shall be as follows.
1.Fiber-Optic. The fiber-optic sign shall consist of fiber-optic glass bundles arranged to define the required message. The glass bundles shall be ground smooth and optically polished at the input and output ends for maximum light transmission. The output ends of the fiber-optic glass bundles that form the sign message shall be terminated using glass lenses or glass end caps. The fiber-optic sign shall control the lamp intensity utilizing the photo control according to Article 1078.01(c)(2)d. The lamp intensity control device shall be wired in series with the step-down transformers in the sign, on the input (120 VAC) side of the transformer. The lamp intensity control device shall be mounted in the bottom of the sign housing. Each fiber-optic sign shall have a separate lamp intensity control device. The lamps shall have a rated minimum life of 5,000 hours.
2.Light Emitting Diode (LED). The LED sign shall consist of standard T–13/4 (5 mm) LED lamps and have an expected lamp life of 100,000 hours. Operating wavelengths shall be Red – 626 nm, Amber – 590 nm, and Bluish/Green – 505 nm. The luminance shall be a minimum of 345 candelas/sq ft (3,700 candelas/sq m) when measured Modular Glare Screen System Art. 1085.01 normal to the plane of the icon surface under standard operating conditions. The LEDs shall not be aluminum gallium arsenide (AIGaAs) material technology. Transformers shall be rated for the line voltage with Class A insulation and weatherproofing. The sign shall be designed for operation over a range of temperatures from -35 to +165 °F (-37 to +75 °C). The LED module shall include the message plate, high intensity LEDs and LED drive electronics. Door panels shall be flat black and electrical connections shall be made via barrier-type terminal strip. All fasteners and hardware shall be corrosion resistant stainless steel.
d.Mounting Bracket. The mounting bracket shall be according to
Article 1078 — 01(f), except no terminal compartment will be required.
SECTION 1085. MODULAR GLARE SCREEN SYSTEM
1085.01 Description. The modular glare screen system shall be according to
the following.
a.Glare Screen Blades. The glare screen blades shall be constructed of durable, impact resistant, polymeric material meeting the following requirements.
1.Wall thickness of the blades shall be 0.10 in. (2.5 mm) minimum, except at corners where it shall be 0.06 in. (1.5 mm) minimum.
2.Specific gravity of the blade walls shall be 0.89 minimum as determined by ASTM D 792.
3.Tensile strength shall be 3000 psi (20,700 kPa) minimum as determined by ASTM D 638 (D 638M).
4.The blades shall be green in color.
5.The blades shall withstand a sharp bend test (90 degree bend without mandrel) at 0 ºF (-18 ºC) without cracking.
b.Base Plates and Rails. Base plates and rails shall be according to the following.
1.Polymeric Base Plate and Rails. Polymeric base plate and rails shall meet the same specific gravity and tensile requirements as the glare screen blades.
2.Metal Base Plates and Rails. Metal base plates and rails shall be according to ASTM A 36 (A 36M) and shall be galvanized according to AASHTO M 111 after fabrication.
c.Anchor Studs, Bolts, or Self-Tapping Screws. Anchor studs, bolts, or self tapping screws, with nuts, flat washers, or lock washers, shall be as
Referenced in this section
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Source: Illinois Standard Specifications for Road and Bridge Construction, 2022 Edition. Pages 1081–1082 of 1,217. View official source ↗