|Other 2-axle, 4-tire vehiclesa||225,613||520,774||999,754||1,467,664||1,758,542|
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, as of September 2006.