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Modelling the saturation flow rate for continuous flow intersections based on field collected data

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  • Xing Gao
  • Jing Zhao
  • Meng Wang

Abstract

The continuous flow intersection [CFI) is an unconventional intersection design which has been used in many cities all over the world. However, as an important parameter for the geometric design, signal timing, and operation evaluation, the saturation flow rate at CFI has not been carefully examined. In this paper, a saturation flow rate adjustment model for CFI intersections is established based on field data under the calculation framework of the HCM2016. Four movements related with CFI, namely the left-turn at the CFI approach, through movement at the CFI approach, left-turn at the pre-signal, and exit movement at the pre-signal, are discussed. The proposed model is validated and the relative error is less than 10%. The treatments to mitigate the negative impact on the saturation flow rate at the CFI are also recommended. The results show the saturation flow rate of the first three movements are decreased due to the CFI control. For the left-turn, through movement, and left-turn at the pre-signal, the degree of the reduction of the saturation flow rate are mainly related to the heavy vehicle ratio, the proportion of lane changing vehicles, and the length of displaced left-turn lanes, respectively.

Suggested Citation

  • Xing Gao & Jing Zhao & Meng Wang, 2020. "Modelling the saturation flow rate for continuous flow intersections based on field collected data," PLOS ONE, Public Library of Science, vol. 15(8), pages 1-18, August.
  • Handle: RePEc:plo:pone00:0236922
    DOI: 10.1371/journal.pone.0236922
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    References listed on IDEAS

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    1. Zhao, Jing & Yan, Jiachao & Wang, Jiawen, 2019. "Analysis of alternative treatments for left turn bicycles at tandem intersections," Transportation Research Part A: Policy and Practice, Elsevier, vol. 126(C), pages 314-328.
    2. Yiming Bie & Zhiyuan Liu & Yinhai Wang, 2017. "A real-time traffic control method for the intersection with pre-signals under the phase swap sorting strategy," PLOS ONE, Public Library of Science, vol. 12(5), pages 1-22, May.
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    Cited by:

    1. Nihat Can Karabulut & Murat Ozen & Oruc Altintasi, 2024. "Understanding the Determinants of Lane Inefficiency at Fully Actuated Intersections: An Empirical Analysis," Sustainability, MDPI, vol. 16(2), pages 1-17, January.
    2. Binghong Pan & Shangru Liu & Zhenjiang Xie & Yang Shao & Xiang Li & Ruicheng Ge, 2021. "Evaluating Operational Features of Three Unconventional Intersections under Heavy Traffic Based on CRITIC Method," Sustainability, MDPI, vol. 13(8), pages 1-30, April.

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