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Four-phase or two-phase signal plan? A study on four-leg intersection by cellular automaton simulations

Author

Listed:
  • Cheng-Jie Jin

    (Jiangsu Key Laboratory of Urban ITS, Southeast University of China, Nanjing, Jiangsu, 210096, P. R. China)

  • Wei Wang

    (#x2020;Jiangsu Province Collaborative Innovation Center of Modern Urban Traffic Technologies, Nanjing, Jiangsu, 210096, P. R. China)

  • Rui Jiang

    (#x2021;School of Engineering Science, University of Science and Technology of China, Hefei, Anhui, 230026, P. R. China)

Abstract

The proper setting of traffic signals at signalized intersections is one of the most important tasks in traffic control and management. This paper has evaluated the four-phase traffic signal plans at a four-leg intersection via cellular automaton simulations. Each leg consists of three lanes, an exclusive left-turn lane, a through lane, and a through/right-turn lane. For a comparison, we also evaluate the two-phase signal plan. The diagram of the intersection states in the space of inflow rate versus turning ratio has been presented, which exhibits four regions: In region I/II/III, congestion will propagate upstream and laterally and result in queue spillover with both signal plans/two-phase signal plan/four-phase signal plan, respectively. Therefore, neither signal plan works in region I, and only the four-phase signal plan/two-phase signal plan works in region II/III. In region IV, both signal plans work, but two-phase signal plan performs better in terms of average delays of vehicles. Finally, we study the diagram of the intersection states and average delays in the asymmetrical configurations.

Suggested Citation

  • Cheng-Jie Jin & Wei Wang & Rui Jiang, 2016. "Four-phase or two-phase signal plan? A study on four-leg intersection by cellular automaton simulations," International Journal of Modern Physics C (IJMPC), World Scientific Publishing Co. Pte. Ltd., vol. 27(03), pages 1-14, March.
    • Handle: RePEc:wsi:ijmpcx:v:27:y:2016:i:03:n:s0129183116500327
    DOI: 10.1142/S0129183116500327
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