Dr. David M. Levinson
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Browsing Dr. David M. Levinson by Subject "accessibility"
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Item Accessibility and the Journey to Work(Pergamon, 1998) Levinson, David MThis study analyzes the effect of accessibility to jobs and houses at both the home and work ends of trips on commuting duration for respondents to a household travel survey in metropolitan Washington, DC. A model is constructed to estimate the effects of demographics and relative location on the journey to work. Analysis finds that residences in job-rich areas and workplaces in housing-rich areas are associated with shorter commutes. An implication of this study is that, by balancing accessibility, the suburbanization of jobs maintains stability in commuting durations despite rising congestion, increasing trip lengths, and increased work and non-work trip making.Item Accessibility-based Evaluation of Transit Projects(2016-08-01) Palmateer, Chelsey; Owen, Andrew; Levinson, David M; Ermagun, AlirezaThis study uses the accessibility-based evaluation method to unpack the interaction effect of transit oriented development and a new transit hub, using the San Francisco Transbay Transit Center Development Plan project. We reveal both the transit oriented development and transit changes positively affect accessibility to jobs and accessibility to workers. However, the magnitude of effects for the transit changes alone are minimal in comparison to the effects of the anticipated transit oriented development changes. This indicates that in areas where there already is transit service, the development of land near the transit service can have a greater impact on accessibility levels than the improvement of connections between transit services. We also unravel the increase in accessibility at the project-level and determine that the increase is greater than the sum of the contributions of the individual portions of the project. This demonstrates that transit changes and transit oriented development have a superadditive effect, although it is negligible in our case.Item The Safest Path: Analyzing the Effects of Crash Costs on Route Choice and Accessibility(2016-08-01) Cui, Mengying; Levinson, David MThe "safest path" is proposed to optimize the on-road safety of individuals and minimize the cost of crashes. In this study, the framework of a link-based crash cost analysis is built and applied to assess the crash cost of each link segment on the road network of the Minneapolis - St. Paul area based on Safety Performance Functions from the perspective of travelers. The safest path is then found for all OD pairs to compare flow patterns and accessibility distributions with those based on the traditional shortest travel time path. While, the safest path does not coincide with the shortest path, the accessibility distributions have similar patterns.