An American National Standard. Approved by American National Standards Institute November 30,2001. A Joint Publication of American Association of State Highway and Transportation Officials (AASHTO) and American Welding Society (AWS). 2002. 385p. This code covers welding fabrication requirements applicable to welded highway bridges. It is to be used in conjunction with the AASHTO Standard Specification for Highway Bridges or the AASHTO LRFD Bridge Design Specifications.