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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 In July 1997, the U.S. Department of Transportation, Federal Highway Administration, reassigned some vehicle-miles from "passenger car" to "other 2-axle, 4-tire." 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, ferry boat, and other transit not specified; 1980 data include "other transit" only. Key: N = data do not exist; P = preliminary; R = revised; U = unavailable. Sources: Various sources, as cited in U.S. Department of Transportation, Bureau of Transportation Statistics, National Transportation Statistics 2001, table 1-29, available Spring 2002 at www.bts.gov, or email to answers@bts.gov. ![]() |
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