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Safety and Efficiency Analysis of Turbo Roundabout with Simulations Based on the Lujiazui Roundabout in Shanghai

Author

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  • Qiujia Liu

    (School of Naval Architecture Ocean & Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China)

  • Jiali Deng

    (School of Naval Architecture Ocean & Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China)

  • Yifan Shen

    (School of Naval Architecture Ocean & Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China)

  • Wenxin Wang

    (School of Naval Architecture Ocean & Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China)

  • Zhan Zhang

    (School of Design, Shanghai Jiao Tong University, Shanghai 200240, China)

  • Linjun Lu

    (School of Naval Architecture Ocean & Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China)

Abstract

Traditional multilane roundabouts have many branch lanes without traffic signs and channelization, which leads to a high tendency for traffic collisions. Turbo roundabouts are a new design that has the potential to reduce lane-change conflicts using canalization to force drivers to keep in specific lanes based on their intended destination. This paper evaluates the safety and efficiency performance of turbo roundabouts for the case of a five-leg roundabout called Lujiazui in Shanghai and provides design and construction guidelines when applying the turbo design. The models for the Lujiazui roundabout and the reconstructed turbo version were built in Vissim, and a comprehensive series of experiments under different traffic volumes and central island radii was performed. Afterward, the conflict statistics extracted from the trajectory files in the Surrogate Safety Assessment Model (SSAM) were analyzed using the conflict severity index (CSI) and were then integrated to calculate the modified conflict frequency (MCF) for safety performance evaluation. A comparative efficiency analysis was also conducted as a supplement. Based on the results, the relative characteristics for safety and efficiency between the turbo and original designs of the Lujiazui roundabout were analyzed. Suggestions to apply the turbo design on a five-leg roundabout are introduced.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jsusta:v:12:y:2020:i:18:p:7479-:d:412149
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    References listed on IDEAS

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    1. Marco Guerrieri & Ferdinando Corriere & Gianfranco Rizzo & Barbara Lo Casto & Gianluca Scaccianoce, 2015. "Improving the Sustainability of Transportation: Environmental and Functional Benefits of Right Turn By-Pass Lanes at Roundabouts," Sustainability, MDPI, vol. 7(5), pages 1-19, May.
    2. Vincenzo Gallelli & Rosolino Vaiana, 2019. "Safety Improvements by Converting a Standard Roundabout with Unbalanced Flow Distribution into an Egg Turbo Roundabout: Simulation Approach to a Case Study," Sustainability, MDPI, vol. 11(2), pages 1-13, January.
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    Cited by:

    1. 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.
    2. Ammar Šarić & Suada Sulejmanović & Sanjin Albinović & Mirza Pozder & Žanesa Ljevo, 2023. "The Role of Intersection Geometry in Urban Air Pollution Management," Sustainability, MDPI, vol. 15(6), pages 1-24, March.
    3. Alicja Sołowczuk & Stanisław Majer, 2023. "Design Study for the Construction of Turbo Roundabouts under Constrained Site Conditions," Sustainability, MDPI, vol. 15(17), pages 1-28, September.

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