Trends in Single Occupant Vehicle and Vehicle Miles of Travel Growth in the United States

Abstract

The primary goal of this study was to gain a stronger quantitative understanding of the factors that have been affecting the dynamics of commuter mode choices and vehicle occupancy levels in recent years, and to use this improved understanding to comment on the potential efficacy of policies designed to increase transit ridership and/or to increase average vehicle occupancy levels. Following an introductory chapter, this report describes the details of the research and analysis that was carried out for the project. Chapter 2 provides details on the development of the databases used in the analyses. The discussion includes a review of relevant data sources that have been used or are potentially useful in studies of this nature, and the subsequent compilation of both cross-sectional and time-series data for use in the analysis. Chapter 3 presents the main findings from the study, including the results of the model estimation using the datasets described in Chapter 2. Several models are presented, for several market segments. These results include both cross-sectional and time-series analyses. Chapter 4 presents the main conclusions based on these findings and an analysis of the implications of the results. The conclusion of the chapter also provides recommendations for further research. Finally, a series of appendices provide more details about the data used in the study.

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