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r If using galvanized steel for the sign panels, provide the same dimensions, including the thickness, as those shown in the plans for aluminum. Fabricate standard sign panel messages in accordance with details included in the Standard Highway Signs Manual published by the U.S. Department of Transportation. The Engineer will not require the submittal of shop drawings for these signs or for non - standard sign panels and messages fabricated in accordance with details shown in the plans. Submit seven copies of shop drawings indicating detailed layout of the sign legend, spacing, and border for all other signs to the Engineer prior to fabrication. If the size of a sign is not specified in the plans, provide the size sign for conventional roadways as shown in the MUTCD. 700 -2.3 Roadside Sign Supports: 700 -2.3.1 Frangible Supports: Provide posts for all frangible sign assemblies consisting of aluminum tubes up to 3 1/2 inches [90 mm] outside diameter with 3/16 inch [4.76 mm] wall thickness, or galvanized steel U- Channel up to 3 lb/ft [4.5 kg /m] as listed on the Qualified Products List, and in accordance with Design Standards, Index Nos. 1 1860 through 11865 for frangible sign supports. 700 -2.3.2 Breakaway Supports: For posts for breakaway sign assemblies, the Contractor may use either aluminum or galvanized steel in accordance with the requirements for breakaway signs in the Design Standards. The Engineer will accept breakaway sign assemblies utilizing load concentrating couplers as an alternate to the slip base. Supply erection drawings with the assemblies. Supply evidence that the proposed couplers meet the breakaway requirements of the AASHTO Standard Specifications for Structural Supports for Highway Signs, Luminaires and Traffic Signals, prior to use on a project. The Department lists alternate proprietary and non - proprietary breakaway assemblies on the Qualified Products List. For an acceptable non - proprietary breakaway lap splice for U- Channel steel posts, refer to the U- Channel Lap Splice Detail. The Engineer may accept other alternate breakaway designs if satisfactorily tested in accordance with the current AASHTO requirements. 700 -2.3.3 Steel Posts: When using steel posts as the structural member in a full length support or breakaway base installation for a small roadway sign, provide steel flanged U- channel consisting of rerolled rail steel or an equivalent billet steel, meeting the mechanical requirements of ASTM A 499, Grade 60, and meeting the chemical requirements of ASTM A 1. For each U- channel, punch or drill 3/8 inch [9.5 mm] diameter holes on 1 inch [25 mm] centers through the center of the post, starting approximately 1 inch [25 mm] from the top and extending the full length of the U -post. Ensure that the weight per foot [meter] of a particular manufacturer's U- channel size does not vary more than ±3 1/2% of its specified weight per foot [meter]. Taper the bottom end of the U- channel post for easier installation. Machine straighten the U- channel to a tolerance of 0.4% of the length. Ensure that post configuration generally complies with the dimensions for Type F or Type M flanged U- channel, as shown on Design Standards, Index No. 11865. Only provide steel components that have been galvanized after fabrication in accordance with ASTM A 123 [ASTM A 123M] and have a smooth uniform finish free from defects affecting strength, durability, and appearance. Attach the sign to the structural member using hardware meeting the manufacturer's recommendations and as specified in the Design Standards. Only use attachment hardware (nuts, bolts, clamps, brackets, braces, etc.) of a non - corrosive metal, March 2007 01000 -150 03- 4122.D r d 6