This graph compares average annual per capita vehicle mileage of U.S. cities categorized
according to their nonmotorized commute mode split. As nonmotorized commuting increases,
average annual mileage declines significantly.
Figure 3 that per capita annual vehicle mileage tends to decline as nonmotorized travel
increases. Although nonmotorized mode split is small (less than 5% of trips and probably
less than 1% of person-miles), the mileage differences are large. Each percentage point
increase in nonmotorized transport is associated with about 700 fewer annual vehiclemiles,
indicating that each nonmotorized
mile
is associated with a reduction of seven
vehicle-miles.
International data shows similar
patterns, as indicated in Figure 4.