1 Percent represents
median of income group. The median is the point where half the income group
spends more and half spends less than the specified percentage.
NOTE: All dollar
amounts are in current 1999 dollars.
SOURCE: U.S. Department of
Transportation, Bureau of Transportation Statistics, calculations based on
data from U.S. Department of Commerce, U.S. Census Bureau, Survey of Income and Program Participation (Hyattsville, MD: 2001), also available at http://www.bls.census.gov/sipp/, as of April 2003.