Operation analysis and capacity improvement of signalized intersections using TRANSYT-7F : case study

Abstract EN

Signalized intersection operation performance evaluation provides important and valuable knowledge about the performance of the city transportation network or system, where signalized intersections are major elements and critical points within the city transportation network.

The capacity and operation performance of signalized intersections as part of the transportation network is very important and more significant because the signalized intersections often control the ability of the city streets and transportation network to accommodate the traffic volumes.

The objective of the present study is operation analysis and capacity improvement of Shahid Hama Rash and Sherai Naqib signalized intersections in Kalar City by suggesting number of intersection capacity improvement scenarios, and investigates the proper scenario among the suggested scenarios to improve the traffic capacity.

The required data for the study purposes like existing geometric design (using field observation) and traffic volumes (using video records through the cameras installed at both intersections) were collected.

The results of this study revealed that Shahid Hama Rash and Sherai Naqib signalized intersections currently operating under congested and low performance conditions, and the suggested intersection capacity improvement scenarios provide reasonable and proper solutions to improve the capacity of the selected signalized intersections.

The combination the first and second improvements has a significant impact on increasing the capacity and improving the quality of operation for both intersections, where the degree of saturation for Shahid Hama Rash reduced from 124% to 83% and the intersection level of service (LOS) changed from F to level of service (LOS) C, and the degree of saturation for Sherai Naqib intersection reduced from 126% to 66% and the intersection level of service (LOS) changed from F to level of service (LOS) D