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Basic Studies on Development of Turn Penalty Functions in Signalized Intersections  

O, Sang-Jin (충북개발연구원)
Kim, Tae-Yeong (충북대학교 도시공학)
Park, Byeong-Ho (충북대학교 도시공학과)
Publication Information
Journal of Korean Society of Transportation / v.27, no.1, 2009 , pp. 157-167 More about this Journal
Abstract
This study deals with the turn penalty functions in the urban transportation demand forecasting. The objectives are to develop the penalty functions of left-turn traffic in the case of signalized intersections, and to analyze the applicability of the functions to the traffic assignment models. This is based on the background that the existing models can not effectively account for the delays of left-turn traffic which is bigger than that of through traffic. In pursuing the above, this study gives particular attention to developing the penalty functions based on the degrees of saturation by simulation results of Transyt-7F, and analyzing the applicability of the functions by the case study of Cheongju. The major findings are the followings. First, two penalty functions developed according to the degrees of saturation, are evaluated to be all statistically significant. Second, the results that the above functions apply to the Cheongju network, are analyzed to be converging, though the iteration numbers increase. Third, the link volumes forecasted by turn penalty functions are evaluated to be better fitted to the observed data than those by the existing models. Finally, the differences of traffic volumes assigned by two functions, which are exponential and divided forms, are analyzed to be very small.
Keywords
traffic assignment; intersection delay; turn penalty; travel forecasting; simulation;
Citations & Related Records
Times Cited By KSCI : 6  (Citation Analysis)
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