NOTES: Only trips in which the
transportation mode, international/domestic status, and international
destination could be determined are included.
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)
