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Optimization of Signal Timing for the Contraflow Left-Turn Lane at Signalized Intersections Based on Delay Analysis

Author

Listed:
  • Bo Feng

    (School of Traffic and Transportation Engineering, Dalian Jiaotong University, Dalian 116028, China)

  • Mingming Zheng

    (School of Traffic and Transportation Engineering, Dalian Jiaotong University, Dalian 116028, China)

  • Yan Liu

    (School of Traffic and Transportation Engineering, Dalian Jiaotong University, Dalian 116028, China)

Abstract

The exit-lanes for a left-turn (EFL) is an unconventional method of organizing traffic for left-turns at signalized intersections. In this paper, we propose a nonlinear optimization model to minimize delay by establishing a delay-time diagram for the left-turn traffic when the left-turn traffic is non-oversaturated, considering the relationship between the pre-signal start node of the exit-lanes for a left-turn and the queuing dissipation time of left-turn vehicles. Model validation is performed with example calculations to compare and analyze each operating index and fleet type after signal timing optimization of intersection lane borrowing left-turn lanes. The results show that compared with the conventional left-turn lane, the average delay of vehicles operating with the model decreased by 15.7%, exhaust emission decreased by 11.4%, and capacity increased by 65.7%. The model can support EFL pre-signal design, where signal control is related to queue dissipation time. In practice, a well-designed pre-signal control scheme based on traffic volume can improve capacity and reduce emissions while minimizing average vehicle delays.

Suggested Citation

  • Bo Feng & Mingming Zheng & Yan Liu, 2023. "Optimization of Signal Timing for the Contraflow Left-Turn Lane at Signalized Intersections Based on Delay Analysis," Sustainability, MDPI, vol. 15(8), pages 1-23, April.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:8:p:6477-:d:1120772
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    References listed on IDEAS

    as
    1. Wong, C.K. & Heydecker, B.G., 2011. "Optimal allocation of turns to lanes at an isolated signal-controlled junction," Transportation Research Part B: Methodological, Elsevier, vol. 45(4), pages 667-681, May.
    2. Xuan, Yiguang & Daganzo, Carlos F. & Cassidy, Michael J., 2011. "Increasing the capacity of signalized intersections with separate left turn phases," Transportation Research Part B: Methodological, Elsevier, vol. 45(5), pages 769-781, June.
    3. Yongtao Zheng & Xuedong Hua & Wei Wang & Jialiang Xiao & Dongya Li, 2020. "Analysis of a Signalized Intersection with Dynamic Use of the Left-Turn Lane for Opposite through Traffic," Sustainability, MDPI, vol. 12(18), pages 1-29, September.
    4. Guler, S. Ilgin & Menendez, Monica, 2014. "Analytical formulation and empirical evaluation of pre-signals for bus priority," Transportation Research Part B: Methodological, Elsevier, vol. 64(C), pages 41-53.
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