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A Path Travel Time Estimation Study on Expressways using TCS Link Travel Times  

Lee, Hyeon-Seok (한국도로공사 도로교통연구원)
Jeon, Gyeong-Su (서울대학교 건설환경공학부)
Publication Information
Journal of Korean Society of Transportation / v.27, no.5, 2009 , pp. 209-221 More about this Journal
Abstract
Travel time estimation under given traffic conditions is important for providing drivers with travel time prediction information. But the present expressway travel time estimation process cannot calculate a reliable travel time. The objective of this study is to estimate the path travel time spent in a through lane between origin tollgates and destination tollgates on an expressway as a prerequisite result to offer reliable prediction information. Useful and abundant toll collection system (TCS) data were used. When estimating the path travel time, the path travel time is estimated combining the link travel time obtained through a preprocessing process. In the case of a lack of TCS data, the TCS travel time for previous intervals is referenced using the linear interpolation method after analyzing the increase pattern for the travel time. When the TCS data are absent over a long-term period, the dynamic travel time using the VDS time space diagram is estimated. The travel time estimated by the model proposed can be validated statistically when compared to the travel time obtained from vehicles traveling the path directly. The results show that the proposed model can be utilized for estimating a reliable travel time for a long-distance path in which there are a variaty of travel times from the same departure time, the intervals are large and the change in the representative travel time is irregular for a short period.
Keywords
Link Travel Time; Path Travel Time; Spatial Detection; Toll Collection System; VDS Travel Time;
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Times Cited By KSCI : 5  (Citation Analysis)
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