UNDERSTANDING THE GROWTH IN NON-WORK VMT

Abstract

This report presents preliminary work to understand the apparent increase in non-work vehicle-miles-traveled (VMT) at household level. The first step was to review available data on travel trends to confirm that non-work VMT is in fact increasing. While available data sources provide convincing evidence of this trend, they are far from conclusive. The next step was to explore factors associated with households (demand side) and with the choices available to households (supply side). This exploration included an assessment of the trend in each factor and the development of hypotheses about its effect on non-work travel. The last step in this report was to summarize findings from existing models of non-work travel behavior on what variables significantly impact non-work travel and in what direction. The report concludes with a discussion of what questions remain and what research approaches may prove fruitful in answering them.

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