Figure 5-21 Changes in the Energy Intensiveness of U.S. Passenger Travel: 1975, 1990, and 1997
Friday, January 6, 2012
Figure 5-21
Changes in the Energy Intensiveness of U.S. Passenger Travel: 1975, 1990, and 1997
Note: 1975 Passenger bus data are not available.
Source: U.S. Department of Transportation, Bureau of Transportation Statistics, National Transportation Statistics 1999, BTS99-04 (Washington, DC: 1999), p. 309.