Specifications include, but are not limited to: ARTICLE 1 SIGNAL POLES 1. Design Design and fabricate traffic signal structures to the 2013 Edition of AASHTO Standard Specifications for Structural Supports for Highway Signs, Luminaires, and Traffic Signals with interim revisions and 10’ Breakaway Signal Pole Replacement Order Details. Design must meet Fatigue Category I. A registered professional engineer shall design the structures and provide stamped shop drawings and calculations. Submit the stamped drawings and calculations for each pole to the Traffic Signal Engineer for approval. a. In the stamped calculations, indicate the edition of Standard Specifications to which the poles are being designed and provide the input data used to design each pole and mast arm, including: design wind speed, cross section shape, yield strengths of the component materials, dimensions of the pole components, and a summary of the loads used. b. On the stamped shop drawings, provide design wind speed and the details for building the poles and mast arms, including: materials specifications, slip fit joint dimensions, pole component dimensions, welds that will be made, and the welding inspection that will be done. Submit the mill certifications for the steel items (plates, bolts, and other related items) to the Traffic Signal Engineer for approval. 2. Fabrication. Fabricate signal structures from tapered steel tubes with a round or 16 sided cross section. Orient handholes located near the base of poles to face downstream of traffic flow. Fabricate tubes with walls up to 1/2 inch thick from the prequalified base metals listed in AWS D1.1. Fabricate elements greater than 1/2 inch thick from steel that conforms to AASHTO M270 and meets the Fracture Critical Impact Test requirements for Zone a. Traffic Engineering will not accept structures that use laminated steel elements. Fabricate the cross section of each tube from no more than 1 piece of steel. Place the welded seams on adjacent sections to form continuous straight seams from the base to the top of the pole. Fabricate breakaway signal poles in accordance with the 10’ Breakaway Signa; Pole Replacement Order Details. Fabricate signal poles from 7 gage (US Standard) sheet steel. Fabricate each post with a minimum inside diameter at the base plate as shown in the Plans. Use 4 inch diameter by 4 inch Schedule 40, ASTM A53, Grade B pipe as a post-top adapter.
