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A Conflict-Based Safety Diagnosis of SCI Roundabouts Using a Surrogate Safety Measure Model

Author

Listed:
  • Mehrzad Hasanvand

    (Department of Road Safety and Transportation Engineering, Tarbiat Modares University, Tehran 14115-335, Iran)

  • Amir Saman Abdollahzadeh Nasiri

    (Department of Civil Engineering, South Tehran Branch, Islamic Azad University, Tehran 15847-43311, Iran)

  • Omid Rahmani

    (Faculty of Civil Engineering, Shahrood University of Technology, Shahrood 36199-95161, Iran
    Civil Engineering Department, West Tehran Branch, Islamic Azad University, Tehran 14619-88631, Iran)

  • Khaled Shaaban

    (Department of Engineering, Utah Valley University, Orem, UT 84058, USA)

  • Hossein Samadi

    (Faculty of Civil Engineering, Shahrood University of Technology, Shahrood 36199-95161, Iran)

Abstract

Recently, the surrogate safety assessment model has been considered for the safety performance analysis of roundabouts. This model can perform a detailed analysis of conflicts based on the trajectory data of vehicles inside the roundabout. The Separated Central Island (SCI) roundabout, as one of the roundabouts with distinct geometrical characteristics, holds the potential for safety evaluation using the conflict-based method. Therefore, in this study, a safety diagnosis of an SCI roundabout was conducted for the first time. In this study, a safety diagnosis procedure for SCI roundabout was first defined; for this purpose, vehicle trajectory data were obtained using an Unnamed Aerial Vehicle (UAV) and then entered into Surrogate Safety Measure Model software (SSAM 3.0). A case study was conducted on the only SCI roundabout in Iran, located in Mashhad. The parameters of Time-to-Collision (TTC), maximum speed difference of two vehicles involved in a collision (MaxΔV), and maximum speed of vehicles in collision (MaxS) were utilized to determine the type and severity of conflicts and risk analysis. The results of roundabout risk analysis showed that the severity level of conflicts is mainly of the injury type and that the lowest severity of conflicts is related to fatality. In addition, the highest frequency of injury conflicts is associated with lane-change conflict and the lowest frequency is linked to rear-end conflict. The highest and lowest frequency of damage conflicts are related to crossing and lane-change conflicts, respectively. After overall risk scoring, the severity level of conflicts is mainly related to injury type and the lowest severity of conflicts is associated with fatality; 31% of the total conflicts obtained are of the damaging type, and 69% are of the injury type. Finally, comparing the results of the conflict data with the 8-year crash data in such roundabouts confirms that in the absence of crash data in such roundabouts traffic engineers can use the roundabout analysis based on this study to predict the safety situation of such roundabouts before implementing engineering processes.

Suggested Citation

  • Mehrzad Hasanvand & Amir Saman Abdollahzadeh Nasiri & Omid Rahmani & Khaled Shaaban & Hossein Samadi, 2023. "A Conflict-Based Safety Diagnosis of SCI Roundabouts Using a Surrogate Safety Measure Model," Sustainability, MDPI, vol. 15(17), pages 1-19, September.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:17:p:13166-:d:1231054
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    References listed on IDEAS

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    1. Qiujia Liu & Jiali Deng & Yifan Shen & Wenxin Wang & Zhan Zhang & Linjun Lu, 2020. "Safety and Efficiency Analysis of Turbo Roundabout with Simulations Based on the Lujiazui Roundabout in Shanghai," Sustainability, MDPI, vol. 12(18), pages 1-16, September.
    2. Salvatore Leonardi & Natalia Distefano, 2023. "Turbo-Roundabouts as an Instrument for Improving the Efficiency and Safety in Urban Area: An Italian Case Study," Sustainability, MDPI, vol. 15(4), pages 1-21, February.
    3. Tullio Giuffrè & Salvatore Trubia & Antonino Canale & Bhagwant Persaud, 2017. "Using Microsimulation to Evaluate Safety and Operational Implications of Newer Roundabout Layouts for European Road Networks," Sustainability, MDPI, vol. 9(11), pages 1-13, November.
    4. Zamir Karwand & Safizahanin Mokhtar & Koji Suzuki & Olakunle Oloruntobi & Muhammad Zaly Shah & Siti Hajar Misnan, 2023. "Impact of Splitter-Island on Pedestrian Safety at Roundabout Using Surrogate Safety Measures: A Comparative Study," Sustainability, MDPI, vol. 15(6), pages 1-17, March.
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