Simulation Analysis of Route Diversion Strategies for Freeway Incident Management: Final Report
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1995-02-01
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TRIS Online Accession Number:00675372
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Abstract:The purpose of this project was to investigate whether simulation models could be used as decision aids for defining traffic diversion strategies for effective incident management. A methodology was developed for using such a model to determine the effects of various incident types on freeway traffic flow and of diversion of freeway traffic on the arterial network. The combined freeway/arterial roadway system was considered so that strategies that provide the lowest overall delay could be established, rather than causing the problem to shift from one location to another. This approach is significant because it addresses the often-held belief that congestion on one roadway can be alleviated by diverting traffic to another roadway when, in fact, the other roadway might not have the capacity to accommodate diverted traffic. CORSIM, a microscopic simulation model developed by the FHWA, was chosen as the model for this study. Since the program is still undergoing testing, some effort was directed toward evaluating the software and determining its potential for application in the analysis of incidents. This process included analysis of the model's ability to simulate incidents and the delay that results. Once the process was established, it was applied to two sites in Northern Virginia for which diversion strategies had been specified in the incident determine their effectiveness in reducing incident-induced congestion during the peak period.
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