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Development of Travel Time Functions Considering Intersection Delay  

Oh, Sang-Jin (충북대학교 도시공학과)
Park, Sang-Hyuk (충북대학교 도시공학과)
Park, Byung-Ho (충북대학교 도시공학과)
Publication Information
Journal of Korean Society of Transportation / v.26, no.4, 2008 , pp. 63-76 More about this Journal
Abstract
The goals of this study are to develop travel time functions based on intersection delay and to analyze the applicability of the functions to traffic assignment models. The study begins with the premise that the existing assignment models can not effectively account for intersection delay time. In pursuing the goals, this study gives particular attention to dividing the link travel time into link moving time and stopped time at node, making the models based on such variables as the travel speed, volume, geometry, and signal data of signalized intersections in Cheongju, and analyzing the applicability of these models to traffic assignment. There are several major findings. First, the study presents the revised percentage of lanes (considering type of intersection) instead of g/C for calculating intersection delay, which is analyzed to be significant in the paired t-test. Second, the assigned results of applying these models to the Cheongju network in EMME/2 are compared with the data observed from a test car survey in Cheongju. The analyses show that the BPR models do not consider the intersection delay, but the modified uniform delay model and modified Webster model are comparatively well fitted to the observed data. Finally, the assigned results of applying these models are statistically compared with the test car survey data in assigned volume, travel time, and average speed. The results show that the estimates from the divided travel time model are better fitted to observed data than those from the BPR model.
Keywords
Traffic Assignment model; Intersection Delay; Capacity of Approaching Road; Travel Time Function; Test Car Survey;
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