Art. 708.04 Sign Panels and Appurtenances The barrier shall include nighttime delineation consisting of either barrier wall markers or corrugated retroreflective panels. The panels shall consist of one 6 x 36 in. (150 x 900 mm) panel per barrier unit and shall be yellow when on center line or left lane line and white when on edge line.
708.04 Method of Measurement . Temporary water filled barrier will be
measured for payment in feet (meters) in place, along the centerline of the barrier.
708.05 Basis of Payment. This work will be paid for at the contract unit price
per foot (meter) for TEMPORARY WATER FILLED BARRIER. Movement of the barrier will not be paid for separately, but shall be included in the contract unit price for temporary water filled barrier. Temporary impact attenuators will be paid for separately. SIGNING SECTION 720. SIGN PANELS AND APPURTENANCES
720.01 Description. This work shall consist of furnishing, fabricating, and/or
installing sign panels, complete with sign faces, legend, and supplemental panels.
720.02 Materials. Materials shall be according to the following.
Item Article/Section
a.Sign Base ............................................................................................... 1090
b.Sign Face, Sign Legend and Supplemental Panels ................................ 1091 The sign mounting support channel shall be manufactured from steel or aluminum. Steel support channels shall be according to ASTM A 653 (A 653M) (mild strip) and Standard 720001 and shall be galvanized. Galvanizing shall be according to ASTM A 525, Coating Designation 90 when galvanized before forming and AASHTO M 232, Class B 2 when galvanized after forming. Aluminum support channels shall be according to ASTM B 308 (B 308M), Alloy 6061-T6 or ASTM B 221 (B 221M), Alloy 6063-T6. The stainless steel banding for mounting signs or sign support channels to light or signal standards shall be according to ASTM A 167 Type 302B, Grade 18-8 stainless steel.
720.03 General. The three types of individual panels are defined by surface
area according to the following descriptions: Type 1 – 9 sq ft (0.84 sq m) or less Sign Panels and Appurtenances Art. 720.04 Type 2 – Over 9 sq ft (0.84 sq m) and less than 24 sq ft (2.2 sq m) Type 3 – 24 sq ft (2.2 sq m) or more The surface area is determined by calculating the area of the smallest rectangle, measured from edge-to-edge (horizontally and vertically), that will circumscribe an individual sign, except in the case of a triangular sign. The area of a triangular sign shall be the net triangular area. A sign panel assembly is composed of one or more sign panels mounted individually or as a group. The two types of sign panel assemblies are defined by the total surface area of the individual sign panels according to the following descriptions: Type A assemblies are composed of Type 1 sign panels with a total sign panel area of 9 sq ft (0.84 sq m) or less. Type B assemblies are composed of Type 1 or Type 2 sign panels with a total sign panel area over 9 sq ft (0.84 sq m). Where any sign legend dimensions shown in the plans conflict with the sign legend manufacturer's recommendations, the dimensions shown in the plans or as determined by the Engineer shall govern. The backs of all sign panels shall be marked in a manner designed to last as long as the sign face material, in letters and numerals at least 3/8 in. (9.5 mm) but no more than 3/4 in. (19 mm) in height with the month and year of manufacture, the name of the sign manufacturer, and the initials IDOT. The faces of all sign panels shall be marked in a manner designed to last as long as the sign face material, in letters and numerals at least 3/8 in. (9.5 mm) but no more than 3/4 in. (19 mm) in height with the initials IDOT and the month and year of manufacture. This marking shall be placed directly adjacent to the sign panel edge. For regulatory and warning signs, the marking shall be placed near the upper right corner of the sign panel. For guide signs, the marking shall be placed near the lower left corner of the sign panel. When standard signs designated by letters and numbers are to be furnished, they shall be according to the MUTCD. Detailed drawings of signs with an "I" preceding the sign designation code are available from the Engineer of Operations. Detailed drawings of all other standard signs are available from the Federal Highway Administration (HTO-20), Washington, D.C. 20590. CONSTRUCTION REQUIREMENTS
720.04 Installation. Sign panels shall be installed using all required
supporting channels and mounting hardware specified. All sheet aluminum sign panels and supporting panels shall be mounted to the sign posts or supporting channels with 5/16 in. (M8) stainless steel, zinc, or cadmium plated steel hex head bolts with lock nuts. For design panels 9 sq ft (0.84 sq m) or greater in area, a flat steel fender washer shall be placed next to the bolt head and the nut. A 1/8 in. (3 mm) thick nylon washer shall be placed between the metal washer and the sign face. For sign panels less than 9 sq ft (0.84 sq m) in area, a Art. 720.05 Sign Panel Overlay standard steel flat washer shall be placed next to the bolt head and nut. A nylon washer shall be placed between the metal washer and the sign face. Supporting channels shall be used to brace sign panels mounted permanently on:
a.Single posts when the sign width is greater than 36 in. (900 mm).
b.More than one post when the distance between the posts is greater than 4 ft (1.2 m). Horizontal supporting channels used to brace individual signs shall be located using the mounting holes prepunched in the sign blank. All bolts and nuts shall have National Coarse Thread (UNC). When a Type 2 panel is to be installed above or below a Type 3 panel, all materials shall be the same as those used for the Type 3 panel. The Contractor shall use the same type of sign base material and sign legend throughout this work. When the plans require auxiliary sign panels or route shields to be installed on a Type 3 sign panel, they shall be fabricated using a sign base according to
Article 1090 — 01 and a sign face according to Article 1091.01.
720.05 State Furnished Signs. When signs are specified to be furnished by
the Department, the signs will be made available to the Contractor upon written request. These signs will be delivered within one week of request and will become the responsibility of the Contractor upon delivery.
720.06 Method of Measurement. Sign panels will be measured for payment
in square feet (square meters) according to Article 720.03.
720.07 Basis of Payment. This work will be paid for at the contract unit price
per square foot (square meter) for SIGN PANEL, of the type specified. When the signs are furnished by the Department, this work will be paid for at the contract unit price per square foot (square meter) for SIGN PANEL (STATE FURNISHED), of the type specified. SECTION 721. SIGN PANEL OVERLAY
721.01 Description. This work shall consist of furnishing, and installing sign
panel overlays, complete with reflectorized or nonreflectorized sign face and legend, on existing sign panels.
721.02 Materials. Materials shall be according to the following.
Item Article/Section
a.Sign Base ............................................................................................... 1090
b.Sign Face (Note 1) .................................................................................. 1091 Sign Panel Overlay Art. 721.03
c.Sign Legends (Note 2) ............................................................................ 1091
d.Overlay Panels (Note 3) .................................................................... 1090.02 Note 1. The sign face shall be Type A. Note 2. The legend shall be Type A, except when black in color. Note 3. The overlay panels shall be 0.08 in. (2 mm) thick. CONSTRUCTION REQUIREMENTS
721.03 General. The existing sign shall be stripped of the sign legend, and
the sign panel overlay and new legend shall be installed on the existing sign base. Ground-mounted sign panels may be taken down or the required work may be done in place. Any sign panel which is removed for overlaying shall be rigidly braced on the backside so the panel shall not flex and damage the overlay while being reinstalled. Sign panel hardware broken during removal of a sign panel shall be replaced. The existing legend shall be completely removed, leaving no rivets protruding from the surface of the panel. The overlay shall be applied in vertical panels not more than 48 in. (1200 mm) nor less than 24 in. (600 mm) in width. Adjacent panels shall be butt-joined with the spaces between joints 0.10 in. (2.5 mm) or less in width. No horizontal joints shall be used, except on sign panels over 12 ft (3.6 m) in height. The panels shall be securely fastened to the sign with 3/16 in. (4.75 mm) aluminum dome head rivets with aluminum mandrels. All rivets shall be matched to the color of the overlay panel being installed. The rivets shall be placed at 12 in. (300 mm) centers or less along all four edges and in a vertical row down the center of the panel at 24 in. (600 mm) centers or less. The rivets shall be approximately 1/4 in. (6 mm) in from open edges. All rivets shall be placed in the area of the aluminum extrusion panel ridge to prevent dimples in the sign panel overlay. The sign sizes and legend sizes shown in the plans shall be verified in the field by the Contractor. The replacement legend shall be the same size and shall be spaced the same as the existing sign. The Contractor shall be responsible for the correct spacing of any revised legend according to the general freeway signing practices. Individual signs shall not be out of service for longer than 24 consecutive hours, subject to the following conditions and exceptions.
a.No more than one advance guide sign of the sequence of signs on an approach to an interchange shall be out of service at any given time. (These signs are labeled "A" in the plans.)
b.Signs labeled "B" may be out of service at the same time as any other signs.
Referenced in this section
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Source: Illinois Standard Specifications for Road and Bridge Construction, 2022 Edition. Pages 649–652 of 1,217. View official source ↗