This paper presents results of an assessment of the state of research on "decoupling" the relationship between vehicle travel and economic growth. In the United States, the long-term trend has been for vehicle travel, as measured in total VMT, to increase at similar rates as economic growth, as measured in gross domestic product (GDP). The goal of this study was to identify policies that have been successful at decoupling the two. It is important to learn whether some countries, states, regions, or local governments have been able to discourage growth in--or even decrease--VMT while simultaneously encouraging economic growth.
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