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a Includes vans, pickup trucks, sport utility vehicles, and other 2-axle, 4-tire motor vehicles that are not passenger cars. b Includes municipally owned transit and commercial, federal, and school buses. c Includes light and heavy rail only. d Fiscal year data. Amtrak began operations in 1971. e Includes demand response, ferryboat, and other transit not specified; 1980 data include ferryboat and "other transit" only. Key: N = data are nonexistent; P = preliminary; U = unavailable. Sources: Various sources, as cited in U.S. Department of Transportation, Research and Innovative Technology Administration, Bureau of Transportation Statistics, National Transportation Statistics, table 1-37, available at http://www.bts.gov, forthcoming.
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