|Travel via long-distance mode (both directions)||Personal vehicle share of opposite direction different mode trips (percent)||Standard error|
|Total for public transportation modes||79.2||0.01|
NOTES: Only trips in which the transportation mode could be identified in both travel directions are considered.
The only statistical difference in the percentage of return trips utilizing personal vehicle is between air and "other" and between bus and "other". All other comparisons in that column are not statistically different.
Underlined estimates are based on a small sample size (<30) or a coefficient of variation greater than 30% and are not reliable.
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)