Highway Safety, Design and Operations. [electronic resource] : Freeway Signing and Related Geometrics: hearings before the United States House Committee on Public Works, Special Subcommittee on Federal-Aid Highway Program, Ninetieth Congress, second session, on May 7-9, July 9-11, 16-18, 1968.
- Washington : U.S. G.P.O., 1968.
- Government document
iv, 661 p. ;
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