U. S. Transportation: Resources, Performance and Problems |
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air traffic air traffic control air transportation aircraft airline airspace American Waterways Operators annual areas automobile average aviation barges buses capacity capital cargo cars cents cities Class I Railroads commodities common carrier construction cost crude oil depreciation diesel dollars economic efficiency Electric employees engine equipment estimated expenditures facilities Federal Federal Aviation Agency Figure fleet flight freight fuel gross growth Gulf Intracoastal Waterway handling highway horsepower improved increased industry intercity Interstate Commerce Commission investment line-haul lines load merchant mileage miles million Motor Bus motor-vehicle Natural Gas Pipeline passenger percent period pipeline companies population problem radar rail Railway rates refineries regulation River roads and streets routes ships Source speed Subway and Elevated Suez Crisis TABLE taxes tonnage tons traffic control transit trend trips Trolley Coach trucks United urban utilization vehicle-miles vehicles vessels waterways World World War II