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air carriers air traffic control aircraft airline airports Amtrak annual automobile average aviation capacity capital cargo cars changes Class I railroads commercial commuter congestion continue costs decline demand deregulation domestic economic efficiency emissions energy environmental equipment estimated facilities fatalities Federal FHWA Figure fleet forecast freight fuel fuel taxes funding future gasoline Government hazardous materials high-speed rail highway Ibid improvements increase industry infrastructure intercity interstate investment levels major methanol metropolitan areas miles million modes motor vehicle natural gas needs OPEC operating passenger percent petroleum pipelines planning population densities ports production programs projected rail reduce regional regulation requirements revenues ridership road route rural safety sector share ships square kilometer Staggers Act subsidies Table tiltrotor tion ton-miles transportation system trends trips trucks U.S. Department U.S. DOT United vertiports Washington waterways