|Less than $25K||Standard error||$25K-$49K||Standard error||$50-$74K||Standard error||$75K+||Standard error|
NOTES: Only trips for which transportation mode and household income can be determined are tabulated.
Column totals may not add to 100 percent due to rounding.
Underlined estimates are based on a small sample size (<30) or a coefficient of variation greater than 30% and are not reliable.
Percentages for shaded cells on the same row are not statistically different, except for the following comparisons: Bus, $25K-$49K and $75K+; Other, $25K-$49K and $75K+, $50K-$74K and $75K+. It should be noted that for "other" modes, all categories except $50K-$74K are based on a sample size that is too small to provide a reliable estimate.
SOURCE: U.S. Department of Transportation, Research and Innovative Technology Administration, Bureau of Transportation Statistics, Federal Highway Administration, National Household Travel Survey, long-distance file, 2001 (Washington, DC)