Evaluation of The Performance of a Roundabout intersection in Surman City by Using Synchro 08 Program

Road intersections are of great importance in traffic and transportation road networks. They are themain joints for distributing and determining traffic directions on the network inside and outsidecities. The better the intersection performs its engineering function by allowing traffic to flowthrough it away from what is known as traffic disruption, represented by an increased in collisionpoints and an increased road intersection accident, the better its quality is, which is evident in thelevel of service during its operation, which is inversely proportional to the delay time. In thisstudy, a roundabout intersection in the city of Surman was chosen to evaluate the performance ofthe current situation by knowing its service level using the (Synchro 08) program, which allows usto improve the service level in case of its decline to find appropriate engineering solutions throughtwo- and three-dimensional simulations. The mechanism of this study was represented incollecting traffic and engineering data for the current situation of the intersection and analyzing itusing the program. Through the simulation shown by the analysis results, it became clear that thelevel of service for the intersection F and the maximum volume capacity ⁄ , which isworse than the bad, and through the proposed alternatives and solutions it became clear that thebest an alternative is to remove the turning island and re-plan the intersection by adding some lanesand organizing it with a traffic light, the results of this alternative show that the service level forintersection C is with a delay time ⁄ and a maximum rate for the size of thecapacitance ⁄ .