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Design Study for the Construction of Turbo Roundabouts under Constrained Site Conditions

Author

Listed:
  • Alicja Sołowczuk

    (Department of Roads and Bridges, West Pomeranian University of Technology in Szczecin, 71-311 Szczecin, Poland)

  • Stanisław Majer

    (Department of Roads and Bridges, West Pomeranian University of Technology in Szczecin, 71-311 Szczecin, Poland)

Abstract

Turbo-roundabouts are one of the most frequently recommended road junction design options when it comes to increasing traffic capacity and traffic safety. This is in particular true of suburban areas, with dominant traffic flow on the main road and moderate traffic flow on the side road. Other intersections handling local traffic and considerably constricting the availability of space are usually located in the vicinity of such intersections. Another factor contributing to the limited availability of land for construction in these locations is the presence of surrounding residential housing. Then, choosing the suitable turbo-roundabout type becomes the main issue. The article presents a case study for the selection of a type of turbo roundabout under the conditions of considerably constricted land availability based on the analysis of the provision of a swept path for the chosen design vehicles. The article considers the standard egg-type turbo-roundabouts, “look-a-like” type turbo-roundabouts, non-standard “flattened” turbo-roundabouts and ellipse-based roundabouts, with non-standard geometries of the truck apron and central island. For each of the analysed roundabout types, setting-out methods were described in detail, allowing the designer to quickly select a type of roundabout suitable for the specific constrained site conditions. This article analyses the applicability of non-standard turbo roundabouts for three area types: LUDA low urbanisation degree area, BA built-up area and CDA highly commercially developed area along the side road, wherever standard roundabouts are not practicable due to constraints imposed by existing buildings, canals or any other obstacles found at the project site.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:17:p:13220-:d:1232113
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    References listed on IDEAS

    as
    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. 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.
    3. 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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