SSF-Roundabout: A Smart and Self-Regulated Roundabout with Right-Turn Bypass Lanes
Source abstract
Abstract
This paper presents the novel, smart, commutable, and self-regulated SSF-Roundabout as one of the potential solutions in the environment of smart mobility. The SSF-Roundabout implements traffic counting systems, smart cameras, LED road markers, and Variable Message Signs (VMS) on arms. Based on the instantaneous detection of the traffic demand level, vehicles can be properly channelled or not into right-turn bypass lanes, which the roundabout is equipped with in every arm, to guarantee the requested capacity, Level of Service (LOS), and safety. In total, fifteen very different layout configurations of the SSF-Roundabout are available. Several traffic analyses were performed by using ad hoc traffic engineering closed-form models and case studies based on many origin-destination traffic matrices (MO/D(t)) and proportions of CAVs in the traffic stream (from 0% to 100%). Simulation results demonstrate the correlation between layout scenarios, traffic intensity, distribution among arms, and composition in terms of CAVs and their impact on entry and total capacity, control delay, and LOS of the SSF-Roundabout. For instance, the right-turn bypass lane activation may produce an entry capacity increase of 48% and a total capacity increase of 50% in the case of 100% of CAVs in traffic streams.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Traffic control and management · Urban Transport Systems Analysis · Transportation Systems and Logistics
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Department of Civil, Environmental and Mechanical Engineering (DICAM), University of Trento, Via Mesiano 77, 38123 Trento, Italy
References (33)
Show source-provided references
1. Extended prediction models for crashes at roundabouts10.1016/j.ssci.2010.07.016 ↗
2. Road safety effects of roundabouts: A meta-analysis10.1016/j.aap.2016.12.018 ↗
3. Robinson, B.W., Rodegerdts, L., Scarborough, W., Kittelson, W., Troutbeck, R., Brilon, W., Bondzio, L., Courage, K., Kyte, M., and Mason, J. (2000). Roundabouts: An Informational Guide, FHWA-RD-00-67.
4. USDOT (2019). Automated Driving Systems: A Vision for Safety.
5. Developing Highway Capacity Manual Capacity Adjustment Factors for Connected and Automated Traffic on Roundabouts10.1061/JTEPBS.0000674 ↗
6. Optimal control of connected and automated vehicles at roundabouts: An investigation in a mixed-traffic environment
7. Single-Lane Roundabout Manager under Fully Automated Vehicle Environment10.1177/0361198119843087 ↗
8. Gill, V., Kirk, B., Godsmark, P., and Flemming, B. (2015). Automated Vehicles: The Coming of the Next Disruptive Technology, The Conference Board of Canada.
9. Wu, Y., and Zhu, F. (2021). Junction management for connected and automated vehicles: Intersection or roundabout?. Sustainability, 13.10.3390/su13169482 ↗
10. A safety assessment of mixed fleets with Connected and Autonomous Vehicles using the Surrogate Safety Assessment Module10.1016/j.aap.2019.06.001 ↗
11. Urban single-lane roundabouts: A new analytical approach using multi-criteria and simultaneous multi-objective optimization of geometry design, efficiency and safety10.1016/j.trc.2017.04.018 ↗
12. New Type of Roundabout: Roundabout with “Depressed” Lanes for Right Turning—“Flower Roundabout”10.7307/ptt.v23i5.153 ↗
13. Lagoa, P., Galvão, T., and Campos Ferreira, M. (2024). Variable Message Signs in Traffic Management: A Systematic Review of User Behavior and Future Innovations. Infrastructures, 9.10.3390/infrastructures9100184 ↗
14. CAVs and roundabouts: Research on traffic impacts and design elements10.1016/j.trpro.2020.09.008 ↗
15. Chalaki, B., Beaver, L.E., and Malikopoulos, A.A. (November, January 19). Experimental Validation of a Real-Time Optimal Controller for Coordination of CAVs in a Multi-Lane Roundabout. Proceedings of the IEEE Intelligent Vehicles Symposium, Las Vegas, NV, USA.
16. Medina, A., and Bansen, J. (2023). Reasons for Drivers Failing To Yield at Multi-Lane Roundabout Exits: Transportation Pooled Fund Study Final Report, FHWA-HRT-23-023.
17. Conflict models for single-lane roundabout slip lanes from microsimulation: Development and validation10.3141/2236-11 ↗
18. Improving the sustainability of transportation: Environmental and functional benefits of right turn by-pass lanes at roundabouts10.3390/su7055838 ↗
19. Assolie, A.A., Sukor, N.S.A., Khliefat, I., and Abd Manan, T.S.B. (2023). Modeling of Queue Detector Location at Signalized Roundabouts via VISSIM Micro-Simulation Software in Amman City, Jordan. Sustainability, 15.10.3390/su15118451 ↗
20. TRUM (2022). Traffic and Road Use Management.
21. Mauro, R. (2010). Calculation of Roundabouts: Capacity, Waiting Phenomena and Reliability, Springer.10.1007/978-3-642-04551-6 ↗
22. Siegloch, W. (1973). Die Leistungsermittlung an Knotenpunkten ohne Lichtsignalsteuerung (Capacity Evaluation at Unsignalized Intersections), Bundesminister fuer Verkehr. Strassenbau und Strassenverkehrstechnik, no. 154.
23. National Academies of Sciences, Engineering, and Medicine (2022). Highway Capacity Manual: A Guide for Multimodal Mobility Analysis, The National Academies Press. [7th ed.].
24. National Academies of Sciences, Engineering, and Medicine (2010). Roundabouts: An Informational Guide, The National Academies Press. [2nd ed.]. TRB, NCHRP Report 672.
25. Tracz, M. (2008, January 18–21). Analysis of Small Roundabouts’ Capacity. Proceedings of the National Roundabout Conference, Kansas City, MO, USA.
26. Tracz, M., Chodur, J., and Ostrowsk, K. (July, January 28). Roundabouts Country report—Poland. Proceedings of the 6th International Symposium on Highway Capacity and Quality of Service, Stockholm, Sweden.
27. ANTi-JAM solutions for smart roads: Ant-inspired traffic flow rules under CAVs environment
28. Guerrieri, M., and Khanmohamadi, M. (2025). COM-Roundabout: The first smart commutable and self-regulating roundabout for HDVs and CAVs. Int. J. Transp. Sci. Technol.10.1016/j.ijtst.2025.04.003 ↗
29. A new methodology to estimate deformation of longitudinal safety barriers
30. Michailidis, P., Michailidis, I., Lazaridis, C.R., and Kosmatopoulos, E. (2025). Traffic Signal Control via Reinforcement Learning: A Review on Applications and Innovations. Infrastructures, 10.10.3390/infrastructures10050114 ↗
31. Comparative life-cycle assessment of conventional (double lane) and non-conventional (turbo and flower) roundabout intersections10.1016/j.trd.2016.08.011 ↗
32. Smart Roads Geometric Design Criteria and Capacity Estimation Based on AV and CAV Emerging Technologies. A Case Study in the Trans-European Transport Network
33. Impacts of roundabouts in suburban areas on congestion-specific vehicle speed profiles, pollutant and noise emissions: An empirical analysis10.1016/j.scs.2020.102386 ↗