Sustainable and Safe Roundabouts

Dear Colleagues,

Road design, with particular reference to intersections regulated with a roundabout scheme, has undergone a profound conceptual evolution in the last 50 years. The reasons for this evolution are to be found in the ever-growing demand for performance by drivers (speed, waiting times, capacity, etc.), together with a higher degree of traffic safety and greater sustainability of road transport. In this direction, the design of roundabouts has passed from the oldest roundabout in the world to the Piccadilly Circus, London (1819, United Kingdom) to the more modern Turboroundabouts, the first of which was built in Barendrecht (2000, Holland).Fortunately, this evolution has always been associated with the production of a large number of studies and research useful for decoding and improving the performance, safety, and sustainability of roundabout junctions. Nevertheless, there are still topics worth investigating, such as the safety of vulnerable road users, the potential conflicts in roundabouts when using surrogate safety measures, the use of microsimulation tools to evaluate the improvement in various intersection solutions in terms of performance and safety, and the environmental benefits of new schemes for roundabouts.This Special Issue aims to collect scientific and research contributions that can help to reach these goals.

Prof. Rosolino Vaiana
Dr. Vincenzo Gallelli
Guest Editors

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