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I I I I I I I I I I Ij 3w 4:30 X30 IE: 'x IM i. 'x' AWA, 'x' x r - - - - - - - I $ I *6 son 1 I $1 $ $ r" I $ I $ 1 I S IF I I SPECIAL REPORT17O 1 I Transportation Research Board, National Academy of Sciences TRANSPORTATION RESEARCH BOARD 1976 Officers HAROLD L. MICHAEL, Chairman ROBERT N. HUNTER, Vice Chairman W. N. CAREY, JR., Executive Director Executive Committee HARVEY BROOKS, Chairman, Commission on Sociotechnical Systems, National Research Council (ex officio) ASAPH H. HALL, Federal Railroad Administrator, U.S. Department of Transportation (ex officio) ROBERT E. PATRICELLI, Urban Mass Transportation Administrator, U.S. Department of Transportation (ex officio) HENRIK E. STAFSETH, Executive Director, American Association of State Highway and Transportation Officials (ex officio) NORBERT T. TIEMANN, Federal Highway Administrator, U.S. Department of Transportation (ex officio) MILTON PIKARSKY, Chairman of the Board, Regional Transportation Authority (ex officio, Past Chairman, 1975) WARREN E. ALBERTS, Vice President, System Operations Services, United Airlines GEORGE H. ANDREWS, Vice President for Transportation Marketing, Sverdrup and Parcel GRANT BASTIAN, State Highway Engineer, Nevada Department of Highways KURT W. BAUER, Executive Director, Southeastern Wisconsin Regional Planning Commission LANGHORNE M. BOND, Secretary, illinois Department of Transportation MANUEL CARBALLO, Secretary, Wisconsin Department of Health and Social Services L. S. CRANE, President, Southern Railway System JAMES M. DAVEY, Consultant, Manchester, Michigan B. L. DeBERRY, Engineer-Director, Texas State Department of Highways and Public Transportation LOUIS J. GAMBACCINI, Vice President and General Manager, Port Authority Trans.Hudson Corporation HOWARD L. GAUTHIER, Professor, Department of Geography, Ohio State- University FRANK C.