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A simple method is presented for long-run forecasting of highway vehicle miles of travel (VMT) based on the assumption that travel is fundamentally time-constrained. Demographic projections by age cohort and sex are used to produce vehicle travel forecasts that vary according to assumptions about license-holding rates and average miles per licensed driver by age and sex. With constant vehicle miles per driver, 2020 forecasts range from 1.93 to 2.30 trillion vehicle-mi. The greatest potential for increased vehicle travel appears to depend on whether rates of travel per female licensed driver will begin to approach those of men. Equal rates would boost 2020 VMT to 2.84 trillion vehicle-mi.
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