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Different Impacts of Independent Recurrent and Non-Recurrent Congestion on Freeway Segments  

Gang, Gyeong-Pyo (한국교통연구원 첨단교통기술연구실)
Jang, Myeong-Sun (한양대학교 교통시스템공학과)
Publication Information
Journal of Korean Society of Transportation / v.25, no.6, 2007 , pp. 99-109 More about this Journal
Abstract
There have been few studies on the impacts of independent recurrent and non-recurrent congestion on freeway networks. The main reason is due partly to the lack of traffic data collected during those periods of recurrent and non-recurrent congestion and partly to the difficulty of using the simulation tools effectively. This study has suggested a methodology to analyze the independent impacts of the recurrent and non-recurrent congestion on target freeway segments. The proposed methodology is based on an elaborately calibrated simulation analysis, using real traffic data obtained during the recurrent and non-recurrent congestion periods. This paper has also summarized the evaluation results from the field tests of two ITS technologies, which were developed to provide drivers with real-time traffic information under traffic congestion. As a result, their accuracy may not be guaranteed during the transition periods such as the non-recurrent congestion. In summary, this study has been focused on the importance of non-recurrent congestion compared to recurrent congestion, and the proposed methodology is expected to provide a basic foundation for prioritizing limited government investments for improving freeway network performance degraded by recurrent or non-recurrent congestion.
Keywords
Recurrent congestion; Nonrecurrent congestion; Simulation calibration; Traffic information and prediction System; Advanced speed information system; Work zone;
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