|Air carrier, large certificated, domestic, all services||Highway||Transit
NOTES: Transit rail modes are measured in car-miles. Car-miles measure individual vehicle-miles in a train-the movement of 1 vehicle the distance of 1 mile. This differs from a train-mile which is the movement of a train, which can consist of multiple vehicles (cars), the distance of 1 mile. 2006 transit data are preliminary.
SOURCES: Air Carrier: Bureau of Transportation Statistics, Highway: Federal Highway Administration, Transit: American Public Transit Association, Rail: Amtrak and Association of American Railroads as cited in U.S. Department of Transportation, Research and Innovative Technology Administration, Bureau of Transportation Statistics, National Transportation Statistics, table 1-32, available at http://www.bts.gov/publications/national_transportation_statistics/ as of October 2008.