Table 9,,,,,
Vehicle-Miles,,,,,
(Millions),,,,,
Mode,1970,1980,1990,1999,2000
Air carriers ,"2,068","2,523","3,963","5,309","5,646"
General aviation,"3,207","5,204","4,830",aN,aN
Passenger cars,"916,700","1,111,596","1,408,286","R1,569,100","1,601,914"
Motorcycles,"2,979","10,214","9,557","10,584","10,479"
"Other 2-axle, ",,,,,
4-tire vehiclesb,"123,286","290,935","574,571","R901,022","924,018"
Trucks:,,,,,
Single-unit,"27,081","39,813","51,901","R70,304","70,583"
Combination,"35,134","68,678","94,341","R132,384","135,208"
Busesc,"4,544","6,059","5,726","R7,662","7,601"
Rail:d,,,,,
Transite,441,403,561,627,U
Commuter,N,179,213,p266,U
Class 1 freight,"29,890","29,277","26,159","33,851","34,590"
Intercity/Amtrakf,690,235,301,342,U
Other transitg,N,15,R324,790,U

"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.",,,,,
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"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.”",,,,,
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"c Includes municipally owned transit, 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-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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