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Safety Evaluation of Turbo-Roundabouts with and without Internal Traffic Separations Considering Autonomous Vehicles Operation

Author

Listed:
  • Tullio Giuffrè

    (Faculty of Engineering and Architecture, University of Enna Kore, Viale delle Olimpiadi, 94100 Enna, Italy)

  • Anna Granà

    (Department of Engineering, University of Palermo, Viale delle Scienze, Ed 8, 90128 Palermo, Italy)

  • Salvatore Trubia

    (Faculty of Engineering and Architecture, University of Enna Kore, Viale delle Olimpiadi, 94100 Enna, Italy)

Abstract

The paper presents a microsimulation approach for assessing the safety performance of turbo-roundabouts where Cooperative Autonomous Vehicles “CAVs” have been introduced into the traffic mix alongside conventional vehicles “CVs”. Based on the analysis of vehicle trajectories from VISSIM and subsequent analysis of traffic conflicts through the Surrogate Safety Assessment Model (SSAM), the research aims to evaluate the safety benefits of turbo-roundabouts where the lanes are physically separated by raised curbs, compared to roundabouts without such curbs. The paper will then describe the methodological path followed to build VISSIM models of turbo-roundabouts with and without raised curbs in order to calibrate the simulation models and estimate the potential conflicts when a higher percentage of CAVs are introduced into the traffic mix. A criterion has been also proposed for setting properly the principal SSAM filters. The results confirmed both higher safety levels for turbo-roundabouts equipped with raised lane dividers compared to turbo-roundabout solutions without curbs, and better safety conditions under the traffic mix of CVs and CAVs. Therefore, it follows that, in absence of crash data including CAVs, the surrogate measures of safety are the only approach in which the safety performance of any roundabout or road entity can be evaluated.

Suggested Citation

  • Tullio Giuffrè & Anna Granà & Salvatore Trubia, 2021. "Safety Evaluation of Turbo-Roundabouts with and without Internal Traffic Separations Considering Autonomous Vehicles Operation," Sustainability, MDPI, vol. 13(16), pages 1-14, August.
    • Handle: RePEc:gam:jsusta:v:13:y:2021:i:16:p:8810-:d:609813
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    References listed on IDEAS

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    1. Vladislav Krivda & Jan Petru & David Macha & Kristyna Plocova & David Fibich, 2020. "An Analysis of Traffic Conflicts as a Tool for Sustainable Road Transport," Sustainability, MDPI, vol. 12(17), pages 1-23, September.
    2. Eric Williams & Vivekananda Das & Andrew Fisher, 2020. "Assessing the Sustainability Implications of Autonomous Vehicles: Recommendations for Research Community Practice," Sustainability, MDPI, vol. 12(5), pages 1-13, March.
    3. Aleksandra Deluka Tibljaš & Tullio Giuffrè & Sanja Surdonja & Salvatore Trubia, 2018. "Introduction of Autonomous Vehicles: Roundabouts Design and Safety Performance Evaluation," Sustainability, MDPI, vol. 10(4), pages 1-14, April.
    4. Jan Petru & Vladislav Krivda, 2021. "An Analysis of Turbo Roundabouts from the Perspective of Sustainability of Road Transportation," Sustainability, MDPI, vol. 13(4), pages 1-25, February.
    5. 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. Alessandro Severino & Giuseppina Pappalardo & Salvatore Curto & Salvatore Trubia & Isaac Oyeyemi Olayode, 2021. "Safety Evaluation of Flower Roundabout Considering Autonomous Vehicles Operation," Sustainability, MDPI, vol. 13(18), pages 1-14, September.

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