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Development of Operating Speed Prediction Models Reflecting Alignment Characteristics of the Upstream Road Sections at Four-Lane Rural Uninterrupted Flow Facility  

Jo, Won-Beom (한국건설기술연구원 도로연구실)
Kim, Yong-Seok (한국건설기술연구원 도로연구실)
Choe, Jae-Seong (서울시립대학교 교통공학과)
Kim, Sang-Yeop (서울시립대학교 교통공학과)
Kim, Jin-Guk (한국건설기술연구원 도로연구실)
Publication Information
Journal of Korean Society of Transportation / v.28, no.5, 2010 , pp. 141-153 More about this Journal
Abstract
The study is about the development of operating speed prediction models aimed for an evaluation of design consistency of four lane rural roads. The main differences of this study relative to previous research are the method of data collection and classification of road alignments. The previous studies collected speed data at several points in the horizontal curve and approaching tangent. This method of collection is based on the assumption that acceleration and deceleration only occurs at horizontal tangents and the speed is kept constant at horizontal curves. However, this assumption leads to an unreliable speed estimation, so drivers' behavior is not well represented. Contrary to the previous approach, speed data were collected with one and data analysis using a speed profile is made for data selection before building final models. A total of six speed prediction models were made according to the combination of horizontal and vertical alignments. The study predicts that the speed data analysis and selection for model building employed in this study can improve the prediction accuracy of models and be useful to analyze drivers' speed behavior in a more detailed way. Furthermore, it is expected that the operating speed prediction models can help complement the current design-speed-based guidelines, so more benefits to drivers as real road users, rather than engineers or decision makers, can be achieved.
Keywords
Speed Prediction Model; Speed Profile; Four-Lane Rural Road; Design Consistency; Alingment Index;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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