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Roads 275 Transportation 173 Design and construction 168 Congresses 139 Maintenance and repair 136 Planning 120 Management 111 Local transit 109 Research 96 Testing 92 Bridges 91 Safety measures 89 Pavements 85 Traffic safety 73 Highway research 55 Highway departments 48 Traffic engineering 46 Data processing 42 Urban transportation 42 Traffic signs and signals 41 Evaluation 36 Finance 36 Environmental aspects 34 Traffic flow 33 Highway engineering 32 Pavements, Asphalt 30 Addresses, essays, lectures 28 Express highways 27 Highway law 26 Mathematical models 26 ראה את כולם ...

National Research Council (U.S.). Transportation Research Board 912 American Association of State Highway and Transportation Officials 253 National Cooperative Highway Research Program 222 United States. Federal Highway Administration 210 National Research Council (U.S.). Transportation Research Board. Meeting 143 United States. Federal Transit Administration 72 Transit Cooperative Research Program 69 National Research Council (U.S.). Highway Research Board 57 Transit Development Corporation 53 National Cooperative Transit Research & Development Program (U.S.) 18 United States. Urban Mass Transportation Administration 14 National Research Council (U.S.). Transportation Research Board. Committee on Maintenance and Operations Personnel 10 American Association of State Highway and Transportation Officials. Subcommittee on Maintenance 9 Texas Transportation Institute 9 United States. Federal Aviation Administration 9 Vance, John C. 8 Pratt, Richard H. 7 Turnbull, Katherine F. 7 Fisher, John W. 1931- 6 National Research Council (U.S.). Transportation Research Board. Committee on Aviation Economics and Forecasting 6 National Research Council (U.S.). Transportation Research Board. Committee on Operational Effects of Geometrics 6 Cambridge Systematics 5 International Skid Prevention Conference Columbus, Ohio 5 International Workshop on Future Aviation Activities Washington, D.C. 5 Levinson, Herbert S. 5 National Research Council (U.S.). Transportation Research Board. Committee on Light Commercial and General Aviation 5 National Research Council (U.S.). Transportation Research Board. Committee on Transportation Education and Training 5 Bronstad, M. E. 4 Evans, John E. IV 4 Humphrey, Thomas F. 4 ראה את כולם ...

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