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

Safety Evaluation of Flower Roundabout Considering Autonomous Vehicles Operation

Department of Civil Engineering and Architecture, University of Catania, 95123 Catania, Italy
Faculty of Engineering and Architecture, Kore University of Enna, 94100 Enna, Italy
School of Mechanical and Industrial Engineering Technology, University of Johannesburg, Johannesburg 2000, South Africa
Author to whom correspondence should be addressed.
Academic Editors: Elżbieta Macioszek, Anna Granà, Tomaž Tollazzi and Tullio Giuffrè
Sustainability 2021, 13(18), 10120;
Received: 27 July 2021 / Revised: 30 August 2021 / Accepted: 3 September 2021 / Published: 9 September 2021
With the significant technological growth that affected autonomous vehicles in the last decade, several consequences occurred as: human factor exclusion, entry and exit manoeuvres precision from roundabouts, and headway reduction. In this paper, it was carried out a microsimulation approach study that aims to evaluate benefits in terms of safety obtained with flower roundabouts in a scenario where traffic is characterized by conventional vehicles “CVs” and Connected Autonomous Vehicles “CAVs”. This study focused on the evaluation of CAVs and CVs operation with the presence of the so called “weak users” or rather, pedestrians and bikes. Then, simulated scenarios were characterized by the presence of zebra-crossings in main roads, positioned at 20 m from circulatory carriageway edges. Micro simulation choice is due to the absence of survey data collection because the presence of CAVs in ordinary traffic is still minimal. The micro simulation was carried out through VISSIM, so it was operated with a specific methodological path, consisting, in the application, of O–D matrix based on real cases, in order to achieve an assessment of potential conflicts in relation with the increase in CAVs. Simulation results showed that higher safety levels were achieved for special cases of O–D distribution and with CAVs present. Finally, considering crash absence in results related to CAVs presence, safety interventions of such roundabout types have to be thorough. There were 10 O/D matrices analysed through VISSIM considering parameters as: average tail length, maximum tail length, average speed, vehicles, and number of stops quantity. As reported in the conclusion section, O/D matrices that showed minimum conflicts and maximum dynamic performances were identified. View Full-Text
Keywords: flower-roundabouts; surrogate measures; traffic conflicts; CAVs flower-roundabouts; surrogate measures; traffic conflicts; CAVs
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MDPI and ACS Style

Severino, A.; Pappalardo, G.; Curto, S.; Trubia, S.; Olayode, I.O. Safety Evaluation of Flower Roundabout Considering Autonomous Vehicles Operation. Sustainability 2021, 13, 10120.

AMA Style

Severino A, Pappalardo G, Curto S, Trubia S, Olayode IO. Safety Evaluation of Flower Roundabout Considering Autonomous Vehicles Operation. Sustainability. 2021; 13(18):10120.

Chicago/Turabian Style

Severino, Alessandro, Giuseppina Pappalardo, Salvatore Curto, Salvatore Trubia, and Isaac O. Olayode. 2021. "Safety Evaluation of Flower Roundabout Considering Autonomous Vehicles Operation" Sustainability 13, no. 18: 10120.

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