Table 1-29M. U.S. Vehicle-Kilometers (Millions)

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^a All operations other than those operating under 14 CFR 121 and 14 CFR 135. Data for 1996 are estimated using new information on nonrespondents and are not comparable to earlier years.  
Mileage in source is multiplied by 1.151 to convert to nautical-miles for 1985-1997, data is then converted to kilometers. 
^b U.S. Department of Transportation, Federal Highway Administration (FHWA), provides data separately for passenger car and motorcycle in its annual Highway Statistics series.
However, the 1995 summary report provides updated data for passenger car and motorcycle combined. Passenger car figures in this table were computed by U.S. Department of
Transportation, Bureau of Transporation Statistics by subtracting the most current motorcycle figures from the aggregate passenger car and motorcycle figures.
^c In July 1997, the FHWA published revised vehicle-kilometers data for the highway modes for many years. The major  
change reflected the reassignment of some vehicles from the passenger car category to the other 2-axle 4-tire vehicle category. 
^d Motor bus and demand responsive figures are also included in the bus figure for highway.
^e Prior to 1985, excludes demand response and most rural and smaller systems funded via Sections 18 and 16(b)2, Federal Transit Act. The series is not continuous between 1980 and 1985.  Transit rail modes are measured in car-kilometers. Car-kilometers measure individual vehicle-kilometers in a train. A 10-car train traveling 1 kilometer would equal 1 train-kilometer and 10 car-kilometers.  Motor bus and demand response figures are also included in the bus figure for highway. 
^f Amtrak began operations in 1971.  
^g Although both train-kilometers and car-kilometers are shown for rail, only train-kilometers are included in the total. A train-kilometer is the movement of a train, which can consist of multiple vehicles (cars),  the distance of 1 kilometer. This differs from a vehicle-kilometer, which is the movement of 1 vehicle the distance of 1 kilometer. A 10-vehicle train traveling 1 kilometer would be measured as  1 train-kilometer and 10 vehicle-kilometers. Caution should be used when comparing train-kilometers with vehicle kilometers.  
^h 1960–65, motorcycle data are included in passenger car, and other 2-axle 4-tire vehicle data included in single-unit 2-axle 6-tire or more truck.  
ⁱ Ferry boat included with other.  

KEY: N = data do not exist; P = preliminary; R = revised; U = data are not available. 

SOURCES: 
Air: 
Air carrier: 
1960: Civil Aeronautics Board, Handbook of Airline Statistics 1969 (Washington, DC: 1970), part III, table 2. 
1965-70: Ibid., Handbook of Airline Statistics 1973 (Washington, DC: 1974), part III, table 2. 
1975-80: Ibid., Air Carrier Traffic Statistics (Washington, DC: 1976, 1981), p. 4 (December 1976) and p. 2 (December 1981). 
1985-98: U.S. Department of Transportation, Bureau of Transportation Statistics, Office of Airline Information, Air Carrier Traffic Statistics (Washington, DC: Annual December issues),  p. 2, line 27 plus line 50. 
General aviation: 
1960-65: U.S. Department of Transportation, Federal Aviation Administration, FAA Statistical Handbook of Aviation 1972 (Washington, DC: 1973), table 9.10. 
1970-75: U.S. Department of Transportation, Federal Aviation Administration, FAA Statistical Handbook of Aviation 1976 (Washington, DC: 1976), table 8-5. 
1980: U.S. National Transportation Safety Board estimate, personal communication, Dec. 7, 1998. 
1985-92: Ibid., General Aviation Activity and Avionics Survey (Washington, DC: Annual issues,) table 3.3. 
1993-97: Ibid., General Aviation and Air Taxi Activity and Avionics Survey (Washington, DC: Annual issues), table 3.3.  
Highway:
Passenger car and motorcycle:
1960-94: U.S. Department of Transportation, Federal Highway Administration, Highway Statistics Summary to 1995 (updated June 1999), Internet site http://www.fhwa.dot.gov/ohim/summary95/index.html, as of July 28, 2000, table VM-201A.
1995-98: Ibid., Highway Statistics (Washington, DC: Annual issues), table VM-1, sum of passenger car and motorcycle.
Motorcycle:
1970-80: U.S. Department of Transportation, Federal Highway Administration, Highway Statistics, Summary to 1985 (Washington, DC: 1986), table VM-201A.
1985-98: Ibid., Highway Statistics (Washington, DC: Annual issues), table VM-1.
Other 2-axle 4-tire vehicle:
1970-94: U.S. Department of Transportation, Federal Highway Administration, Highway Statistics Summary to 1995 (updated June 1999), Internet site http://www.fhwa.dot.gov/ohim/summary95/index.html, as of July 28, 2000, table VM-201A.
1995-98: Ibid., Highway Statistics (Washington, DC: Annual issues), table VM-1.
Single-unit 2-axle 6-tires or more truck, combination truck, and bus:
1960-94: U.S. Department of Transportation, Federal Highway Administration, Highway Statistics Summary to 1995 (updated June 1999), Internet site http://www.fhwa.dot.gov/ohim/summary95/index.html, as of July 28, 2000, table VM-201A.
1995-98: Ibid., Highway Statistics (Washington, DC: Annual issues), table VM-1.
Transit: 
1960-98: American Public Transit Association, Public Transportation Fact Book (Washington, DC: 2000), table 42, 84, and similar tables in earlier editions. 
Rail: 
Class I rail freight train- and car-miles: 
1960-98: Association of American Railroads, Railroad Facts, 1998 (Washington, DC: 1999), p. 33 (train-miles) and p. 34 (car-miles). 
Intercity/Amtrak train-miles: 
1960-70: Association of American Railroads, Yearbook of Railroad Facts (Washington, DC: 1975), p. 39. 
1975-98: Amtrak, Amtrak Annual Report, Statistical Appendix (Washington, DC: Annual issues). 
Intercity/Amtrak car-miles: 
1960-75: Association of American Railroads, Yearbook of Railroad Facts (Washington, DC: 1975), p. 40. 
1980-98: Amtrak, Amtrak Corporate Reporting, Route Profitability System, personal communication, 1999.