|Other 2-axle, 4-tire vehiclesb||123,286||290,935||574,571||923,059||966,184|
|Class 1 freight||29,890||29,277||26,159||34,590||34,680|
aThe 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 vehicles that are not passenger cars.
c Includes municipally owned transit, commercial, federal, and school buses.
e Includes light and heavy rail only.
f Fiscal year data. Amtrak began operations in 1971.
g Includes demand responsive, ferryboat, and other transit not specified; 1980 data include "other transit" only.
Key: N = data are nonexistent; P = preliminary.
Sources: Various sources, as cited in U.S. Department of Transportation, Bureau of Transportation Statistics, National Transportation Statistics, table 1-32, available at http://www.bts.gov (latest data forthcoming).