| Year | Highway | Transit | Rail | Air | Total |
| billion passenger-miles | |||||
| 1960 | 1,272.4 | 4.2 | 17.1 | 33.4 | 1,322.9 |
| 1965 | 1,555.4 | 4.1 | 13.3 | 57.6 |
1,626.3
|
| 1970 | 2,042.2 | 4.6 | 6.2 | 117.5 | 2,165.9 |
| 1975 | 2,404.3 | 4.5 | 3.9 | 147.4 | 2,555.6 |
| 1980 | 2,563.5 | 39.9 | 4.5 | 219.1 | 2,917.0 |
| 1985 | 3,012.4 | 39.6 | 4.8 | 290.1 | 3,346.9 |
| 1990 | 3,561.6 | 41.1 | 6.1 | 358.9 | 3,961.6 |
| 1991 | 3,612.4 | 40.7 | 6.3 | 338.1 | 3,997.5 |
| 1992 | 3,600.4 | 40.2 | 6.1 | 354.8 | 3,961.3 |
| 1993 | 3,691.0 | 39.4 | 6.2 | 362.2 | 4,104.8 |
| 1994 | 3,767.0 | 39.6 | 5.9 | 388.4 | 4,200.9 |
| 1995 | 3,908.3 | 39.8 | 5.5 | 403.9 | 4,357.5 |
| 1996 | 4,010.1 | 41.4 | 5.1 | 445.3 | 4,501.9 |
| 1997 | 4,130.2 | 43.3 | 5.2 | 463.1 | 4,598.5 |
Source: U.S. Department of Transportation, Bureau of Transportation Statistics, National Transportation Statistics 1999, Table 1-30 (DOT, BTS, Washington, DC, 2000).
Notes: BTS has rounded the categories on this table as follows: to the nearest billion passenger-miles; Passenger-Miles, total; Highway; to the nearest 100 million passenger-miles: Air; Transit; and Rail. Highway includes passenger car and taxi, motorcycle, other 2-axle 4-tire vehicle, single unit 2-axle 6-tire or more truck, combination truck, intercity bus, and school bus. Highway passenger-miles are calculated by multiplying vehicle-miles of travel as cited by the U.S. Department of Transportation, Federal Highway Administration by the number of occupants for each vehicle type (as estimated by the U.S. Department of Transportation, Federal Highway Administration using the Nationwide Personal Transportation Survey). Transit includes motor bus, light rail, heavy rail, trolley bus, commuter rail, demand response, ferry boat, and other. Transit passenger-miles are the cumulative sum of the distance ridden by each passenger. Rail includes intercity/Amtrak, which began operations in 1971. Rail passenger-miles represent the movement of one passenger for one mile. Does not include contract commuter passengers. Air includes air carrier, certified domestic service and general aviation. Air carrier passenger-miles are computed by the summation of the products of the aircraft miles flown on each inter-airport hop multiplied by the number of passengers carried on that hop.
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