Simulation study for Changing some roundabouts in Karbala government into signalized roundabouts

Abstract

This research aims to analyze and evaluate some of the main roundabouts in Karbala Governorate after they were converted to signalized roundabouts by the simulation program PTV VISSIM. These roundabouts suffer from large traffic, which leads to a significant decrease in their level of service (LOS), especially at peak times, when it is observed that the traffic police intervene to direct the traffic and reduce congestion. Therefore, one of the proposals was to use the light signal to control the roundabout at peak times. The results were positive in the first roundabout, as the level of service (LOS) decreased from F to D, and the LOS of the other roundabout also decreased, though to a lesser extent, from F to E due to heavy traffic volumes at peak times and design errors in the roundabout.