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

Abstract

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