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An Analysis of the Interactions between Adjustment Factors of Saturation Flow Rates at Signalized Intersections

Author

Listed:
  • Yi Wang

    (Beijing Key Laboratory of Traffic Engineering, Beijing Engineering Research Center of Urban Transport Operation Guarantee, Beijing University of Technology, Beijing 100124, China)

  • Jian Rong

    (Beijing Key Laboratory of Traffic Engineering, Beijing Engineering Research Center of Urban Transport Operation Guarantee, Beijing University of Technology, Beijing 100124, China)

  • Chenjing Zhou

    (School of Civil and Transportation Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China)

  • Xin Chang

    (Beijing Key Laboratory of Traffic Engineering, Beijing Engineering Research Center of Urban Transport Operation Guarantee, Beijing University of Technology, Beijing 100124, China)

  • Siyang Liu

    (Beijing Key Laboratory of Traffic Engineering, Beijing Engineering Research Center of Urban Transport Operation Guarantee, Beijing University of Technology, Beijing 100124, China)

Abstract

An insufficient functional relationship between adjustment factors and saturation flow rate (SFR) in the U.S. Highway Capacity Manual (HCM) method increases an additional prediction bias. The error of SFR predictions can reach 8–10%. To solve this problem, this paper proposes a comprehensive adjusted method that considers the effects of interactions between factors. Based on the data from 35 through lanes in Beijing and 25 shared through and left-turn lanes in Washington, DC, the interactions between lane width and percentage of heavy vehicles and proportion of left-turning vehicles were analyzed. Two comprehensive adjustment factor models were established and tested. The mean absolute percentage error (MAPE) of model 1 (considering the interaction between lane width and percentage of heavy vehicles) was 4.89% smaller than the MAPE of Chinese National Standard method (Standard Number is GB50647) at 13.64%. The MAPE of model 2 (considering the interaction between lane width and proportion of left-turning vehicles was 33.16% smaller than the MAPE of HCM method at 14.56%. This method could improve the accuracy of SFR prediction, provide support for traffic operation measures, alleviate the traffic congestion, and improve sustainable development of cities.

Suggested Citation

  • Yi Wang & Jian Rong & Chenjing Zhou & Xin Chang & Siyang Liu, 2020. "An Analysis of the Interactions between Adjustment Factors of Saturation Flow Rates at Signalized Intersections," Sustainability, MDPI, vol. 12(2), pages 1-18, January.
    • Handle: RePEc:gam:jsusta:v:12:y:2020:i:2:p:665-:d:309479
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    References listed on IDEAS

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    1. Hongxing Zhao & Ruichun He & Xiaoyan Jia, 2019. "Estimation and Analysis of Vehicle Exhaust Emissions at Signalized Intersections Using a Car-Following Model," Sustainability, MDPI, vol. 11(14), pages 1-25, July.
    2. Chang-qiao Shao & Xiao-ming Liu, 2012. "Estimation of Saturation Flow Rates at Signalized Intersections," Discrete Dynamics in Nature and Society, Hindawi, vol. 2012, pages 1-9, November.
    3. Kimber, R. M. & McDonald, M. & Hounsell, N., 1985. "Passenger car units in saturation flows: Concept, definition, derivation," Transportation Research Part B: Methodological, Elsevier, vol. 19(1), pages 39-61, February.
    4. Yan, Chiwei & Jiang, Hai & Xie, Siyang, 2014. "Capacity optimization of an isolated intersection under the phase swap sorting strategy," Transportation Research Part B: Methodological, Elsevier, vol. 60(C), pages 85-106.
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    Cited by:

    1. Santos Sánchez-Cambronero & Fernando Álvarez-Bazo & Ana Rivas & Inmaculada Gallego, 2021. "Dynamic Route Flow Estimation in Road Networks Using Data from Automatic Number of Plate Recognition Sensors," Sustainability, MDPI, vol. 13(8), pages 1-30, April.
    2. 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.

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