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Article

Synchronous Roundabouts with Rotating Priority Sectors (SYROPS): High Capacity and Safety for Conventional and Autonomous Vehicles

1
Departamento de Automatica, Escuela Politecnica Superior, Universidad de Alcala, 28807 Madrid, Spain
2
Multimedia Communications Lab (KOM), Technical University of Darmstadt, 64283 Darmstadt, Germany
*
Author to whom correspondence should be addressed.
Electronics 2020, 9(10), 1726; https://doi.org/10.3390/electronics9101726
Received: 15 September 2020 / Revised: 9 October 2020 / Accepted: 14 October 2020 / Published: 20 October 2020
(This article belongs to the Special Issue Smart Road: Innovative, Sustainable and Resilient Technologies)
Roundabouts are a highway engineering concept meant to reduce congestion and improve safety. However, experience shows that capacity of roundabouts is limited, and safety is not optimal. However, these improvements in capacity and safety should be compatible with both manually-driven and autonomous vehicles. Incorporating existing advanced technologies to the signaling and control of roundabouts will undoubtedly contribute to these improvements but should not restrict this compatibility. We approach roundabouts as synchronous switches of vehicles, and propose a roundabout system (synchronous roundabouts with rotating priorities) based on vehicle platoons arriving at the roundabout at a uniform speed and within the time slot assigned to their entry, avoiding conflicts and stops. The proposed signaling system is visual for human drivers and wireless for connected and autonomous vehicles. We evaluated analytically and with simulations roundabouts of different radii for several values of the average distance between vehicles. Results show that average delays are 28.7% lower, with negligible dispersion. The capacity improvements depend on design parameters, moderate for small roundabouts, but that goes up to 70–100% for short inter vehicular distances and medium and large roundabouts. Simulations with unbalanced traffic maintained the capacity improvement over standard roundabouts.
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Keywords: roundabouts; road-traffic engineering; road-traffic signaling; intelligent transport systems; connected vehicles; traffic safety roundabouts; road-traffic engineering; road-traffic signaling; intelligent transport systems; connected vehicles; traffic safety
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MDPI and ACS Style

Ibanez, G.; Meuser, T.; Lopez-Carmona, M.A.; Lopez-Pajares, D. Synchronous Roundabouts with Rotating Priority Sectors (SYROPS): High Capacity and Safety for Conventional and Autonomous Vehicles. Electronics 2020, 9, 1726. https://doi.org/10.3390/electronics9101726

AMA Style

Ibanez G, Meuser T, Lopez-Carmona MA, Lopez-Pajares D. Synchronous Roundabouts with Rotating Priority Sectors (SYROPS): High Capacity and Safety for Conventional and Autonomous Vehicles. Electronics. 2020; 9(10):1726. https://doi.org/10.3390/electronics9101726

Chicago/Turabian Style

Ibanez, Guillermo, Tobias Meuser, Miguel A. Lopez-Carmona, and Diego Lopez-Pajares. 2020. "Synchronous Roundabouts with Rotating Priority Sectors (SYROPS): High Capacity and Safety for Conventional and Autonomous Vehicles" Electronics 9, no. 10: 1726. https://doi.org/10.3390/electronics9101726

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