4-3,,,,,
Vehicle-Miles,,,,,
(Millions),,,,,
Mode,1970,1980,1990,2000,2004
Air,,,,,
Air carrier ,"2,068","2,523","3,963","5,664","6,552"
General aviation,"3,207","5,204","4,548",aN,aN
Highway,,,,,
Passenger cars,"916,700","1,111,596","1,408,266","1,600,287","1,704,982"
"Other 2-axle, 4-tire vehiclesb","123,286","290,935","574,571","923,059","1,014,342"
Motorcycles,"2,979","10,214","9,557","10,469","10,048"
Busesc,"4,544","6,059","5,726","7,590","6,637"
Trucks:,,,,,
Single-unit,"27,081","39,813","51,901","70,500","81,107"
Combination,"35,134","68,678","94,341","135,020","145,398"
Raild:,,,,,
Transite,441,403,561,648,P710
Commuter,N,179,213,271,P295
Intercity/Amtrakf,690,235,301,368,308
Class 1 freight,"29,890","29,277","26,159","34,590","37,071"
Other transitg,N,15,324,833,P986
"a The Federal Aviation Administration has estimated vehicle-miles for general aviation aircraft through 1997, relying in part on hours-flown survey data. Vehicle-miles estimates for subsequent years are not yet available.",,,,,
"b Includes vans, pickup trucks, sport utility vehicles, and other 2-axle, 4-tire motor vehicles that are not passenger cars.",,,,,
"c Includes municipally owned transit and commercial, federal, and school buses.",,,,,
d Car-miles.,,,,,
e Includes light and heavy rail only.,,,,,
f Fiscal year data. Amtrak began operations in 1971.,,,,,
"g Includes demand response, ferryboat, and other transit not specified; 1980 data include “other transit” only.",,,,,
Key: N = data are nonexistent; P = preliminary.,,,,,
"Sources: Except as noted, various sources, as cited in U.S. Department of Transportation, Research and Innovative Technology Administration, Bureau of Transportation Statistics, National Transportation Statistics, table 1-32, available at http://www.bts.gov, as of October 2006.",,,,,
"2004 transit, commuter, and other transit: American Public Transportation Association, 2006 Public Transportation Fact Book, table 12 and 15, available at http://www.apta.com/research/stats/, as of October 2006.",,,,,
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