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http://dx.doi.org/10.7855/IJHE.2015.17.4.089

Study of Feasibility Analysis for the Protected-Permissive Left-Turn Signal Control in Three-Leg Signalized Intersections Using a Microscopic Traffic Simulation Model  

Yun, Ilsoo (아주대학교 교통시스템공학과)
Park, Sangmin (아주대학교 건설교통공학과)
Heo, Nak Won (도로교통공단 교통과학연구원)
Yoon, Jung Eun (한국건설기술연구원 도로연구소)
Kim, Young Sun (아주대학교 교통연구센터)
Lee, Sang Soo (아주대학교 교통시스템공학과)
Publication Information
International Journal of Highway Engineering / v.17, no.4, 2015 , pp. 89-98 More about this Journal
Abstract
PURPOSES : This study evaluated the feasibility of implementing protected-permissive left-turn (PPLT) signals at three-leg signalized intersections. METHODS: A three-leg signalized intersection with permissive left-turn was first selected. A VISSIM simulation model was constructed using data collected from the test site. The VISSIM network was calibrated by adjusting related parameter values in order to minimize the difference between the simulated and surveyed critical gap. The calibrated network was validated by the number of waiting left-turning vehicles per cycle. Finally, the mobility and safety measures were extracted from simulation runs in which permissive, protected left turns as well as PPLTs were realized based on diverse traffic volume scenarios. RESULTS : The mobility-related measures of effectiveness (MOEs) of the case with PPLT outperformed the other two left-turn treatment scenarios. In particular, the average waiting time per cycle for the left-turn vehicles in the case with PPLT was reduced by 30 s. The safety-related MOEs of the case with PPLT were somewhat higher than those in the case with protected left-turns and much higher than those in the case with permissive left-turns. CONCLUSIONS : Based on the mobility- and safety-related MOEs generated from the VISSIM simulation runs, the use of PPLT seems to be feasible at three-leg signalized intersections where the left-turn is permissive and a pedestrian signal exists at the conflicting approach. However, in order to use the PPLT in earnest, it is necessary to revise the road traffic act, traffic signs, and related manuals.
Keywords
Protected-Permissive Left-Turn; Simulation; Surrogate Safety Assessment Model; Critical Gap; Left-Turn Treatment;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
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