Table 10,,,,,
Passenger-Miles,,,,,
(Millions),,,,,

Mode,1970,1980,1990,1999,2000
Air carriers,"108,442","204,368","345,873","487,906","515,367"
General aviation,"9,100","14,700","13,000",U,U
Passenger cars,"1,750,897","2,011,989","2,281,391","R2,494,870","2,547,044"
Motorcyclesa ,"3,277","12,257","12,424","R11,527","11,527"
"Other 2-axle, ",,,,,
4-tire vehicles,"225,613","520,774","999,754","R1,432,625","1,469,189"
Busesb,N,N,"121,398","R162,445","161,152"
Rail:,,,,,
Transitc,N,"10,939","12,046",U,U
Commuter,"4,592","6,516","7,082",U,U
"Intercity/
Amtrakd",,,,,
,"6,179","4,503","6,057","5,330","5,498"
Other transite,N,390,841,U,U

"a In July 1997, the U.S. Department of Transportation, Federal Highway Administration, reassigned some vehicles from “passenger car” to “other 2-axle, 4-tire.”",,,,,
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"b Includes municipally owned transit, commercial, federal, and school buses.",,,,,
c Includes light and heavy rail only.,,,,,
d Fiscal year data. Amtrak began operations in 1971.,,,,,
"e Includes demand-responsive, ferry boat, and other transit not specified; 1980 data include ferry boat and “other transit” only.",,,,,
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Key: N = data do not exist; R = revised. U = unavailable.,,,,,
"Sources: Various sources, as cited in U.S. Department of Transportation, Bureau of Transportation Statistics, National Transportation Statistics 2001, table 1-31, available Spring 2002 at www.bts.gov, or email to answers@bts.gov.",,,,,
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