TABLE 31a U.S. Households by Number of Vehicles: 2001,, ,, Number of vehicles ,Households (millions),Percent of Households None, 8.5 ,7.9 1, 33.7 ,31.4 2, 39.9 ,37.1 3, 16.2 ,15.1 4, 6.0 ,5.6 5 or more, 3.2 ,3.0 All, 107.4 ,100.0 "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.",,