1992 = 100
NOTES: Passenger car does not include motorcycle data. Transit includes travel by motor bus, heavy rail, commuter rail, light rail, ferry boat, trolley bus, demand response, and other transit vehicles. Bus comprises all travel by bus including intercity, transit, and school bus. This results in some double counting of bus passenger-miles of travel (pmt). For consistency, air pmt includes air carrier aviation only, as general aviation pmt 2002 data were not available at the time this report was prepared.
To make it easier to compare data of differing magnitudes over time, the Bureau of Transportation Statistics divided the data for all years in each category (see table 1-2b) by the initial year value and multiplied the result by 100.
SOURCE: U.S. Department of Transportation, Research and Innovative Technology Administration, Bureau of Transportation Statistics, calculations using data in table 1-2b.