Bureau of Transportation Statistics (BTS)
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Table A-3
Mean Number of Personal Vehicles by Number of People in the Household

(see Figure 1 in text)

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  Mean SE
One person 1.01 0.010
Two people 1.98 0.011
Three people 2.31 0.023
Four people 2.39 0.023
Five people 2.48 0.040
Six people 2.50 0.074
Seven or more people 2.76 0.113

NOTE: SE = standard error.

SOURCE: The 2001 National Household Travel Survey, household file, U.S. Department of Transportation.