Turbo-Roundabouts as an Instrument for Improving the Efficiency and Safety in Urban Area: An Italian Case Study

In recent years, numerous turbo-roundabouts have been built in many European countries. To date, there are no Italy and even the regulations do not provide for their implementation. Turbo-roundabouts considered ideal alternative to multi-lane roundabouts as they advantages. However, offer better operational performance only specific traffic flow distributions. This research used case study of an important complex urban arterial road eastern Sicily, Italy, compare safety between turbo-roundabouts. The evaluations were carried out with two simulation software: (1) AIMSUN Next 20.0.1 (operational performance); (2) SSAM 3.0 (safety performance). results show that at medium/low volumes, significantly superior terms performance. At high improves significantly. As regards parameters, is always increase TTC PET, a reduction maximum speeds decelerations. There also significant decrease conflict points. Ultimately, efficiency should: Encourage administrations replace (illegal Italy) turbo-roundabouts; encourage Italian legislators revise intersection design legislation include among possible solutions.