NOTE: Data are from the daily travel segment of
the 2001 National Household Travel Survey. Long-distance travel data (i.e.,
trips of 50 miles or more collected during a 4-week travel period) are not
included here.
SOURCE: U.S. Department of Transportation,
Bureau of Transportation Statistics and Federal Highway Administration,
National Household Travel Survey, Preliminary Data Release Version 1,
available at http://nhts.ornl.gov, as of January 2003.
