Figure 3
Distributions of Basic Mobility Variables in the United States
a: Travel Time

Daily travel time, minutes
b: Travel Money Expeniture Shares

Travel money expenditures, percent of total expenditures
c: Trip Rate

Number of trips per capita per day
d: Trip Distance

Mean trip distance, miles
Sources: Research Triangle Institute (1997) for travel time, trip rate, and trip distance; Nelson (1994) for travel money expenditures
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