Performance Analysis of Basic Turbo-Roundabouts in Urban Context

A turbo roundabout is a new type of canalized multilane intersection in which the physical separation between lanes helps toprevent side collisions when crossing the roundabout. This paper presents an estimation of capacity, delays and level of serviceof basic turbo roundabouts in undersaturation conditions, considering both vehicle flow and pedestrian traffic. The trafficperformance model was developed by evaluating the capacity for each entry lane. Owing to the geometric features of theintersection, the total entry capacity is obtained by considering different values of the pedestrian impedance factor and degreeof saturation at both the right-turn and left-turn lanes.