4155.01 DESCRIPTION.
Guardrail materials shall meet the requirements for the type of guardrail specified. Guardrail posts shall be wood or steel as specified in the contract documents.

4155.02 FORMED STEEL BEAM GUARDRAIL.
Rail elements, and terminal sections shall meet requirements of AASHTO M 180. Thrie-beam rail shall be furnished when required. Rail elements and terminal sections shall be Class A, 12 gauge (2.67 mm thickness), Type I, unless a greater thickness is required. Anchor bolts used to attach beam rail to bridge barrier rail shall meet requirements of ASTM F 1554, Grade 105, and shall be full-length galvanized. Washers shall meet the requirements of ASTM F 436. Nuts shall meet the requirements of ASTM A 563, DH, and be heavy hex, Class 2B. All other bolts, nuts, and washers shall meet the requirements of ASTM A 307, Grade A; ASTM A 563, Grade A, hex; and ASTM F 844; respectively. Galvanizing shall meet the requirements of ASTM A 153, Class C.

4155.03 CABLE.

A.  Cable Rail.
Cable shall meet requirements of AASHTO M 30, Type I, Class A.

Wire rope safety barrier shall meet the manufacturer's requirements.

B.  Anchor Cable.
Cable shall meet the requirements of AASHTO M 30, Type II, Class A.

4155.04 WOOD POSTS.
Wood posts shall be sawed to the dimensions shown in the contract documents and meet requirements of Section 4164.

4155.05 STEEL POSTS.
Steel posts and blocks shall meet the requirements of ASTM A 36/A 36M structural steel of the dimensions shown in the contract documents. Steel posts and blocks shall be galvanized in accordance with the requirements of ASTM A 123. Bolt holes shall be provided in accordance with Article 2408.39, B. Galvanizing shall be done after fabrication and after all bolt holes have been drilled.

4155.06 SPACER BLOCKS.
Wood spacer blocks shall meet requirements for wood posts. Steel spacers shall meet requirements for steel posts. Spacer blocks manufactured from alternate materials that have received FHWA approval for use on the National Highway System may be substituted for wood or steel spacer blocks. A list of approved spacer blocks is found on the World Wide Web at the following URL: http://safety.fhwa.dot.gov/fourthlevel/pro_res_road_nchrp350.htm

4155.07 MISCELLANEOUS ITEMS.
Miscellaneous items and materials shall be of the type, size, and dimension shown in the contract documents. All metal parts shall be galvanized, however, any items or parts of items to be covered with 2 inches (50 mm) or more of concrete need not be galvanized. Internal threads of fasteners may be oversize, tapped after galvanizing. Anchor angles, anchor cable, turnbuckles, hooked bolts, and compensating devices, as well as any other fittings or special hardware which may be required, shall be subject to approval of the Engineer when specific requirements are not stated in the contract documents. All cable fittings required for cable guardrail installation shall be designed and fabricated so as to develop the full strength of a single cable or the multiple cable assembly, as applicable.