Impact of Roundabout Metering on the Operational Performance of Roundabout: A Case Study of Jawalakhel, Nepal

Abstract

Roundabout is a type of intersection which improves efficiency and safety performance compared to other types of intersection. Jawalakhel roundabout serves to minimize the resulting conflict between the vehicles; however, due to increasing vehicular movements it is facing challenges like delay, poor level of service and traffic congestion. Classified traffic volume study through videographic survey is carried out and the volume is converted to passenger car unit at morning and evening peak period. SIDRA intersection V 8.0 was used for simulation and analysis of intersection’s performance. The performance is accessed in terms of delay, degree of saturation, level of service & 95% of queue vehicles were calculated for existing condition. As the operational performance was found unsatisfactory with level of service F; alternatives were considered. Among alternatives, roundabout metering on two approaches was adopted and their respective impact on the operational performance was analyzed. The overall roundabout improvement was not observed on two alternates of roundabout metering.