Table 13:  Percent of Long Distance Trips by Mode for Household Income Groups,,,,,,,,,,,
,Less than $25K ,Standard error,$25K-$49K ,Standard error,$50-$74K,Standard error,$75K+,Standard error, ,,
Mode,,,,,,,,,,,
Personal vehicle,92.2,0.81,93.3,0.40,91.7,0.55,83.9,0.63,,,
Air,3.0,0.34,3.8,0.29,5.3,0.39,13.7,0.61,,,
Bus,3.8,0.57,2.1,0.19,2.0,0.29,1.5,0.19,,,
Train,0.7,0.22,0.6,0.18,0.8,0.22,0.8,0.15,,,
Other,0.3,0.28,0.1,0.05,0.3,0.14,0.2,0.05,,,
Total,100.0,,100.0,,100.0,,100.0,,,,
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NOTES:  Only trips for which transportation mode and household income can be determined are tabulated.",,,,,,,,,,,
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Column totals may not add to 100 percent due to rounding.",,,,,,,,,,,
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Underlined estimates are based on a small sample size (<30) or a coefficient of variation greater than 30% and are not reliable. ",,,,,,,,,,,
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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)",,,,,,,,,,,