Table A-18a,,,,,,, "Long-Distance Trips by Mode and Sex, in Percent",,,,,,, ,Female,,Male ,,,, ,Percent,SE,Percent,SE,,, Personal vehicle,42.3,0.52,57.7,0.52,,, Air,42.6,1.14,57.4,1.14,,, Bus,54.9,2.75,45.1,2.75,,, Train,42.3,6.73,57.7,6.73,,, Other,30.4,9.07,69.6,9.07,,, NOTE: SE = standard error.,,,,,,, "SOURCE: The 2001 National Household Travel Survey, preliminary long-distance trip file, U.S. Department of Transportation.",,,,,,,