Optimization of Delay at Isolated Signalized Intersection Using HCS2010 and SIDRA Intersection 8 Software: a Case Study

Abstract

Signalized intersections play a significant role in regulating the traffic stream in urban transportation networks. Extensive delay increases travel time cost and reduces Level Of Service (LOS). This study is conducted to determine delay at five isolated signalized intersections in Erbil city, Iraq using two software to improve intersection performance. The Highway Capacity Software (HCS+T7F) and Signalized and Unsignalized Intersection Design and Research Aid (SIDRA Intersection 8) software. An optimizing model following the Genetic Algorithm (GA) has been applied to optimize the signal cycle time using HCS2010(HCS+T7F) and SIDRA software in order to minimize delay at signalized intersections. The average delay value for all the intersections has been reduced after optimization using SIDRA delay model, which represents 21% reduction. On the other hand, by using HCS2010, the value has been reduced by 29% reduction, which is still higher than average field measured delay. In addition, SIDRA optimizing model has a lower optimum cycle time compared with HCS2010 optimize model. For better performance, the intersections should be optimized depending on the SIDRA.