1091SIGN FACE, SIGN LEGEND, AND SUPPLEMENTAL PANELS

Sign Face, Sign Legend, and Supplemental Panels Art. 1091.02 1075

Plywood sign panels shall not be used with Type A retroreflective sheeting.

1091.01Sign Face Material Requirements. The sign face material shall be in

accordance with the Department’s Fabrication of Highway Signs Policy.

The sheeting for the background, legend, border, shields, and symbols shall be provided by the same manufacturer

1091.02Sign Legend and Supplemental Panel Material Requirements. The

sign legend and supplemental panel material shall be in accordance with the Department’s Fabrication of Highway Signs Policy and the Illinois Manual for Uniform Traffic Control Devices.

Signs shall be fabricated such that the material for the background, legend, border, shields, and symbols are applied in the preferred orientation for the maximum retroreflectivity per the manufacturer’s recommendation. When using Type ZZ retroreflective sheeting, the nesting of legend, border, shields, or symbols will not be permitted.

Letters and numerals used shall be according to the standard alphabets for highway signs (available from the Federal Highway Administration) of the series indicated in the design details for the sign.

The finished letters, numerals, symbols, panels, and borders shall show careful workmanship and be clean cut, sharp, and have essentially a plane surface.

supplemental panel shall be supplied with mounting holes and shall be secured to the sign face with aluminum dome head rivets with aluminum mandrels and may not be held in place, even temporarily, using any type of adhesive that would damage the sign face, legend unit, or border when removed at a later date. All rivets shall be color matched to the legend or supplemental panel being installed.

affixed to clean, dust-free sign panels in a manner specified by the legend manufacturer. The legend and border shall be cut neatly at any intersecting panel edge.

Direct applied retroreflective sheeting and nonreflective sheeting used for legend and border shall be according to Article 1091.03.

The sheeting may be manufactured with a thin aluminum layer between the sheeting and the precoated adhesive.

on flat frames for legend and border shall be according to Article 1091.03.

Art. 1091.03 Sign Face, Sign Legend, and Supplemental Panels 1076 Flat frames shall be 0.032 in. (0.8 mm) aluminum according to ASTM B 209, Alloy 3003-H 14. The frames shall be properly degreased and etched and treated with a light, tight, amorphous chromate type coating before any sheeting is applied.

(2 mm) sheet aluminum according to Article 1090.02 with reflective sheeting applied according to Article 1091.03.

1091.03Retroreflective and Nonreflective Sheeting and Translucent

Overlay Films. The retroreflective sheeting shall serve as the reflectorized background for sign messages and as cutout legends and symbols applied to the reflectorized background. Nonreflective sheeting shall be used as material for cutout legends and symbols applied to the reflectorized background. Translucent overlay films may be used to provide color to white retroreflective sheeting. Messages may be applied in opaque black or transparent colors.

All material furnished under this specification shall have been manufactured within 18 months of the delivery date. All material used to fabricate individual signs shall be supplied by the same manufacturer.

a flexible, colored, prismatic, or glass lens elements adhered to a synthetic resin, encapsulated by a flexible, transparent plastic having a smooth outer surface. Only suppliers whose products have been tested and approved in the Department’s periodic Sheeting Study will be eligible to supply material. All individual batches and or lots of material shall be tested and approved by the Department. The Department reserves the right to sample and test delivered materials according to ASTM D 4956.

sensitive adhesive according to ASTM D 4956. The adhesive shall have a protective liner that is easily removed when tested according to ASTM D 4956. The adhesive shall be capable of being applied to new or refurbished aluminum and reflectorized backgrounds without additional adhesive.

throughout the length of each roll. The color shall conform to the latest appropriate standard color tolerance chart issued by the U.S. Department of Transportation, Federal Highway Administration and to the daytime and nighttime color requirements of ASTM D 4956. Sheeting used for side by side overlay applications shall have a Hunter Lab Delta E of less than 3.

with averaging, the sheeting shall have a minimum coefficient of retroreflection as shown in the following tables. The brightness of the sheeting when totally wet shall be a minimum of 90 percent of the values shown when tested according to the standard rainfall test specified in Section 7.10.1 of AASHTO M 268-84.

Sign Face, Sign Legend, and Supplemental Panels Art. 1091.03 1077

Type A Sheeting Minimum Coefficient of Retroreflection candelas/footcandle/sq ft (candelas/lux/sq m) of material

Type A Observation Angle (deg.) Entrance Angle (deg.)

White

Yellow

Orange

Red

Green

Blue

Brown 0.2 -4 250 170 100 45 45 20 12 0.2 +30 150 100 60 25 25 12 8.5 0.5 -4 95 65 30 15 15 8 5 0.5 +30 75 50 25 10 10 5 3.5

Type AA Sheeting Minimum Coefficient of Retroreflection Candelas/footcandle/sq ft (candelas/lux/sq m) of material

Type AA (Average of 0 and 90 degree rotation) Observation Angle (deg.) Entrance Angle (deg.)

White

Yellow

Red

Green

Blue

FO 0.2 -4 800 600 120 80 40 200 0.2 +30 400 300 60 35 20 100 0.5 -4 200 150 30 20 10 75 0.5 +30 100 75 15 10 5 35

Type AA (45 degree rotation) Observation Angle (deg.) Entrance Angle (deg.)

Yellow

FO 0.2 -4 500 165 0.2 +30 115 40 0.5 -4 140 65 0.5 +30 60 30

Type AP Sheeting Minimum Coefficient of Retroreflection Candelas/footcandle/sq ft (candelas/lux/sq m) of material

Type AP (Average of 0 and 90 degree rotation) Observation Angle (deg.) Entrance Angle (deg.)

White

Yellow

Red

Green

Blue

Brown

FO 0.2 -4 500 380 75 55 35 25 150 0.2 +30 180 135 30 20 15 10 55 0.5 -4 300 225 50 30 20 15 90 0.5 +30 90 70 15 10 7.5 5 30

Art. 1091.03 Sign Face, Sign Legend, and Supplemental Panels 1078

Type AZ Sheeting Minimum Coefficient of Retroreflection Candelas/footcandle/sq ft (candelas/lux/sq m) of material

Type AZ (Average of 0 and 90 degree rotation) Observation Angle (deg.) Entrance Angle (deg.)

White

Yellow

Red

Green

Blue

FYG

FY 0.2 -4 375 280 75 45 25 300 230 0.2 +30 235 170 40 25 15 190 150 0.5 -4 245 180 50 30 20 200 155 0.5 +30 135 100 25 15 10 100 75 1.0 -4 50 37.5 8.5 5 2 45 25 1.0 +30 22.5 20 5 3 1 25 12.5

Type ZZ Sheeting Minimum Coefficient of Retroreflection Candelas/footcandle/sq ft (candelas/lux/sq m) of material

Type ZZ (Average of 0 and 90 degree rotation) Observation Angle (deg.) Entrance Angle (deg.)

White

Yellow

Red

Green

Blue

FYG

FY

FO 0.2 -4 570 425 90 60 30 460 340 170 0.2 +30 190 140 35 20 10 150 110 65 0.5 -4 400 300 60 40 20 320 240 120 0.5 +30 130 95 20 15 7 100 80 45 1.0 -4 115 90 17 12 5 95 70 35 1.0 +30 45 35 7 5 2 35 25 15

resistant. Accelerated laboratory weathering will be used for provisional qualification of sheeting before the results from accelerated outdoor weathering are available. When they become available, the results from outdoor weathering take precedence over the results from laboratory-accelerated weathering tests.

Accelerated weathering testing will be performed for 1000 hours (300 hours for orange/FO) according to ASTM G 151. The testing cycle will consist of 8 hours of light at 140 °F (60 °C), followed by 4 hours of condensation at 104 °F (40 °C). Following accelerated weathering, the sheeting shall exhibit a minimum of 80 percent of its initial minimum coefficient of retroreflection as listed in the previous tables. The sheeting shall exhibit a Hunter Lab Delta E of 5 or less when compared to the original.

Outdoor weathering will entail an annual evaluation of material placed in an outdoor rack with a 45 degree angle and a southern sun exposure. The sheeting will be evaluated for five years. Following weathering, the

Sign Face, Sign Legend, and Supplemental Panels Art. 1091.03 1079 test specimens will be cleaned by immersing them in a five percent hydrochloric acid solution for 45 seconds, then rinsed with water and blotted dry with a soft clean cloth. Following cleaning, the applied sheeting shall show no appreciable discoloration, cracking, streaking, crazing, blistering, or dimensional change. The sheeting shall exhibit a Hunter Lab Delta E of 5 or less when compared to the original.

not shrink in any dimension more than 1/32 in. (0.8 mm) in ten minutes and not more than 1/8 in. (3 mm) in 24 hours.

blistering, edge lifting, inter-film splitting, curling, or discoloration when processed and applied using mutually acceptable processing and application procedures.

corrosion-resistant, and weather-resistant surfaces and adhere securely when tested according to ASTM D 4956.

manufacturing cutout legends and borders shall provide sufficient positionability during the fabrication process to permit removal and reapplication without damage to either the legend or sign background and shall have a plastic liner suitable for use on bed cutting machines. Thereafter, all other adhesive and bond requirements contained in the specification shall apply.

Positionablility shall be verified by cutting 4 in. (100 mm) letters E, I, K, M, S, W, and Y out of the positionable material. The letters shall then be applied to a sheeted aluminum blank using a single pass of a 2-lb (0.90-kg) roller. The letters shall sit for five minutes and then a putty knife shall be used to lift a corner. The thumb and fore finger shall be used to slowly pull the lifted corner to lift letters away from the sheeted aluminum. The letters shall not tear or distort when removed.

shall be less than or equal to 0.015 in. (0.4 mm), or 0.025 in. (0.6 mm) for prismatic material.

according to the sheeting manufacturer’s specifications at temperatures of 60 to 100 °F (15 to 38 °C) and within a relative humidity range of 20 to 80 percent. The sheeting shall be heat resistant and permit forced curing without staining the applied or unapplied sheeting at temperatures recommended by the manufacturer. The sheeting shall be solvent resistant and capable of being cleaned with VM&P naptha, mineral spirits, and turpentine.

Transparent color and opaque black inks shall be single component and low odor. The inks shall dry within eight hours and not require clear coating. After color processing on white sheeting, the sheeting shall

Art. 1091.03 Sign Face, Sign Legend, and Supplemental Panels 1080 show no appreciable discoloration, cracking, streaking, crazing, blistering, or dimensional change when tested for durability (4). The ink on the weathered, prepared panel shall exhibit a Hunter Lab Delta E of 5 or less when compared to the original.

Transparent color electronic cutting films shall be acrylic. After application to white sheeting, the films shall show no appreciable discoloration, cracking, streaking, crazing, blistering, or dimensional change when tested for durability (4). The films on the weathered, prepared panel shall exhibit a Hunter Lab Delta E of 5 or less when compared to the original.

Transparent colors screened, or transparent acrylic electronic cutting films, on white sheeting, shall meet the minimum initial coefficient of retroreflection values of the 0.2 degree observation angle, -4.0 degree entrance angle values as listed in the previous tables for the color being applied. After durability testing, the colors shall retain a minimum 80 percent of the initial coefficient of retroreflection.

sheeting unique to the manufacturer. If material orientation is required for optimum retroreflectivity, permanent orientation marks shall be incorporated into the face of the sheeting. Neither the overall pattern nor the orientation marks shall interfere with the retroreflectivity of the sheeting.

sheeting type, color, adhesive type, manufacturer’s lot number, date of manufacture, and supplier’s name. Safety Data Sheets and technical bulletins for all materials shall be furnished with each shipment.

flexible, pigmented cast vinyl film having a smooth, flat outer surface and shall meet the following requirements. The Department reserves the right to sample and test delivered materials according to ASTM D 4956.

sensitive adhesive according to ASTM D 4956. The adhesive shall have a protective liner that is easily removed when tested according to ASTM D 4956. The adhesive shall be capable of being applied to new or refurbished aluminum and reflectorized backgrounds without additional adhesive.

throughout the length of each roll.

rating of 40 when tested according to ASTM D 523.

elements for seven years shall show no appreciable discoloration, cracking, crazing, blistering, delamination, or loss of adhesion. A slight

Sign Face, Sign Legend, and Supplemental Panels Art. 1091.03 1081 amount of chalking is permitted but the sheeting shall not support fungus growth.

6 1/2 x 6 1/2 in. (165 x 165 mm) pieces of aluminum according to the manufacturer’s specifications. The edges of the panel shall be trimmed evenly and aged 48 hours at 70 to 90 °F (21 to 32 °C). Shrinkage and immersion testing shall be as follows.

(0.4 mm) from any panel edge when subjected to a temperature of 150 F (66 C) for 48 hours and shall be sufficiently heat resistant to retain adhesion after one week at 150 °F (66 °C).

decrease in adhesion, color, or general appearance when examined one hour after being immersed to a depth of 2 or 3 in. (50 or 75 mm) in the following solutions at 70 to 90 °F (21 to 32 °C) for specified times.

Solution Immersion Time (hours) Reference Fuel (M I L-F-8799A) (15 parts xylol and 85 parts mineral spirits by weight) Distilled Water 24 SAE No. 20 Motor Oil 24 Antifreeze (1/2 ethylene glycol, 1/2 distilled water) 24

corrosion-resistant, and weather-resistant surfaces and adhere securely when tested according to ASTM D 4956.

shall be a maximum of 0.005 in. (0.13 mm).

plastic liner.

sheeting type, color, adhesive type, manufacturer’s lot number, date of manufacture, and supplier’s name. Safety Data Sheets and technical bulletins for all materials shall be furnished with each shipment.

SECTION 1092. RESERVED

Art. 1093.01 Sign Supports 1082

SECTION 1093. SIGN SUPPORTS

1093.01Structural Steel Supports. The structural steel shall have a silicone

content suitable for galvanizing.

(M 270M).

After fabrication, the post, fuse plate, base plate, and upper 6 in. (150 mm) of the stub post shall be galvanized according to AASHTO M 111. Bolts and nuts on the fuse plates may be plated according to ASTM B 633 (B 633M) SC3 and then painted with an approved zinc rich paint.

All high strength bolts, nuts, and washers shall be according to Article 1006.08(b).

Grade B or ASTM A 501.

After fabrication, the post, base plate, and upper 6 in. (150 mm) of the stud post shall be galvanized according to AASHTO M 111.

All high strength bolts, nuts, and washers shall be according to Article 1006.08(b).

according to the standard specification for cold rolled carbon steel sheets commercial quality ASTM A 1008 (A 1008M). The post shall be formed to size and, if necessary, shall be welded in such a manner that weld or flash shall not interfere with telescoping. Holes 7/16 ± 1/64 in. (11 ± 0.4 mm) will be spaced on 1 in. (25 mm) centers on at least two opposite sides. The holes shall align to accept a 3/8 in. (10 mm) bolt through the post at any location. The post shall have a smooth galvanized finish applied either before or after forming.

The following tolerances will be permitted.

The nominal outside dimension will not vary more than ±0.008 in. (± 0.2 mm) [± 0.10 in.(± 2.5 mm) for the 2 1/4 in. (57 mm) size] from the dimension stipulated. The wall thickness will not vary more than +0.011 to -0.008 in. (+0.28 to -0.20 mm) from the standard 12 gauge plate thickness. The maximum allowable twist in a 3 ft (1 m) length and the permissible variation in squareness shall be as shown in the following table.

Post Size Squareness Twist 1 3/4 x 1 3/4 in. ±0.010 in. 0.062 in. 2 x 2 in. ±0.012 in. 0.062 in. 2 1/4 x 2 1/4 in. ±0.014 in. 0.062 in.