EVALUATING THE EFFECTS OF SIGNALIZED INTERSECTIONS ON THE ROUNDABOUT SAFETY AND CAPACITY: A CASE STUDY FROM OSIJEK

Abstract

Urban traffic management is a critical component of sustainable city planning, directly influencing mobility, safety, and environmental impact.  In many urban environments, roundabouts and signalised intersections are fundamental elements of traffic control, each with distinct operational characteristics and implications for traffic flow. The interplay between these two types of intersections is particularly significant in densely populated areas where the proximity of different types of intersections can have compounding effects on traffic behaviour. Signalised intersections and roundabouts are prominent features of Osijek’s traffic network, each playing a vital role in managing the flow of vehicles and pedestrians. This study analyzed the safety and operational indicators of a single roundabout and a roundabout in a corridor between two traffic signalized intersections. The safety features were analyzed using the Microsimulation Traffic Model (VISSIM) and Surrogate Safety Assessment Model (SSAM). The analysis of operational indicators included field measurements and microsimulation traffic modeling with a default and calibrated model.