Investigation of the Effect of Phase Plans on Network Performance Criteria in Transportation Networks Consisting of Coordinated Signalized Intersections

In developing cities, traffic problems caused by rapid urban growth and increasing private car usage have a direct and indirect effect on users on the urban transportation systems. It is an established fact that intersections-defined as the points at which traffic flows intersect-are fundamental components of urban transportation networks. However, if not operated correctly, these intersections can induce congestion. Signalized intersections are a common component of urban transportation networks, improving performance and safety. The fundamental signal parameters of signalized intersections-cycle time, green phase, and offset-affect vehicle delays and so the performance of the network. Literature often states that phase plans and the number of phases are important parameters affecting intersection and transportation network performance. This study developed the DIFET model by combining the Differential Evolution optimisation method and the Transyt-7F traffic model to determine phase plans' effect on network performance in coordinated signalized networks. The Transyt-7F performance index value was selected as the performance criterion. The model was tested on a network of 9 intersections. The analysis results show that phase plans and the number of phases significantly affect network performance. Left-turn ratios must be considered with traffic volumes in the approach lanes to the intersections when selecting phase plans.