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Safety Improvements by Converting a Standard Roundabout with Unbalanced Flow Distribution into an Egg Turbo Roundabout: Simulation Approach to a Case Study

Author

Listed:
  • Vincenzo Gallelli

    (Department of Civil Engineering, University of Calabria, 87036 Rende, Italy)

  • Rosolino Vaiana

    (Department of Civil Engineering, University of Calabria, 87036 Rende, Italy)

Abstract

In 2011, the United Nations Road Safety Collaboration (UNRSC) developed a Global Plan for the Decade of Action for Road Safety 2011–2020. Among the categories or “pillars” of activities, is the improvement of road safety for infrastructures. Furthermore, this plan is aligned by the UN Sustainable Development Goals that included even traffic safety. In this regard, this study estimates safety improvements achieved by converting a standard roundabout into an egg turbo roundabout. In particular, turbo roundabouts have become very popular in Northern Europe for both their safety and their capacity. Many studies have shown these advantages thanks to their features: preventive separation of entering flows, limited lane changing and low speeds due to curbs. Given the absence of existing turbo roundabouts in Italy, this research studied and compared a “virtual” roundabout with spiraling circular carriageways to an existing multi-lane roundabout in order to assess its significant reduction in terms of potential collisions. This study relied on traffic conflicts in micro-simulation by using VISSIM software and then Surrogate Safety Assessment Model (SSAM). The research is based on the traffic process observed at a standard roundabout in Cosenza (Italy) marked by a high level of congestion and safety problems. Speeds, critical gaps, queue lengths, and floating car data, obtained from video observations, have been used as input data for the calibration procedure of the first scenario (case study roundabout). Then, the turbo roundabout solution was built and simulated by using the previously derived parameters. Finally, the two roundabout scenarios were compared in terms of spatial distribution of the potential conflicts determined by SSAM. The results could help to measure the performance and safety impact of these two roundabout configurations.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jsusta:v:11:y:2019:i:2:p:466-:d:198465
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    References listed on IDEAS

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    1. Yok Hoe Yap & Helen M. Gibson & Ben J. Waterson, 2013. "An International Review of Roundabout Capacity Modelling," Transport Reviews, Taylor & Francis Journals, vol. 33(5), pages 593-616, September.
    2. 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.
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    Cited by:

    1. Mariano Gallo & Mario Marinelli, 2020. "Sustainable Mobility: A Review of Possible Actions and Policies," Sustainability, MDPI, vol. 12(18), pages 1-39, September.
    2. 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.
    3. 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.
    4. Vincenzo Gallelli & Giusi Perri & Rosolino Vaiana, 2021. "Operational and Safety Management at Intersections: Can the Turbo-Roundabout Be an Effective Alternative to Conventional Solutions?," Sustainability, MDPI, vol. 13(9), pages 1-15, May.
    5. Elżbieta Macioszek, 2020. "Roundabout Entry Capacity Calculation—A Case Study Based on Roundabouts in Tokyo, Japan, and Tokyo Surroundings," Sustainability, MDPI, vol. 12(4), pages 1-21, February.

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