Ramp meters on trial: Evidence from the Twin Cities metering holiday |
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Authors: | David Levinson Lei Zhang |
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Institution: | aDepartment of Civil Engineering, University of Minnesota, 500 Pillsbury Drive SE, Minneapolis, MN 55455, United States;bDepartment of Civil, Construction, and Environmental Engineering, Oregon State University, 220 Owen Hall, Corvallis, OR 97331, USA |
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Abstract: | Ramp meters in the Twin Cities have been the subject of a recent test of their effectiveness, involving turning them off for eight weeks. This paper analyzes the results with and without ramp metering for several representative freeways during the afternoon peak period. Seven performance measures: mobility, equity, productivity, consumers’ surplus, accessibility, travel time variation and travel demand responses are compared. It is found that ramp meters are particularly helpful for long trips relative to short trips. Ramp metering, while generally beneficial to freeway segments, may not improve trip travel times (including ramp delays). The reduction in travel time variation comprises another benefit from ramp meters. Non-work trips and work trips respond differently to ramp meters. The results are mixed, suggesting a more refined ramp control algorithm, which explicitly considers ramp delay, is in order. |
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Keywords: | Ramp meters Evaluation Equity Mobility Accessibility Productivity Consumers’ surplus Travel time variation Travel demand |
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