Optimization of traffic flow organization at pre-signal controlled intersections

LI Bo; GAO Chao; FAN Zhaodong

doi:10.3969/j.issn.1672-0032.2025.04.001

Abstract：To address the congestion problems caused by saturated and oversaturated traffic flow at urban road intersections and improve the efficiency of intersection traffic flow organization,an optimization method for traffic flow organization at pre-signal controlled intersections is proposed.Based on the channelization design of intersection approach lane and the coordination of main and pre-signal phase sequences,this method aims to improve the efficiency of left-turn and through traffic flows at intersection approaches and the utilization of intersection temporal and spatial resources.Two operation modes are designed for left-turn and through phases at approaches that continuous release mode and separate release mode.Experimental validation is conducted.Results indicate that:under different traffic volumes at intersection approach lane,pre-signal controlled intersections have smaller average signal cycle times,mean vehicle delays,and rates of increase in average vehicle delay with increasing approach lane traffic volume compared to traditional single-stop-line intersections,the separate release mode of pre-signal controlled intersections performs better than the continuous release mode in terms of average signal cycle times,mean vehicle delays,and rates of increase in average vehicle delay with increasing approach lane traffic volume;under the separate release mode of pre-signal controlled intersections during traffic flow saturated or oversaturated conditions on intersection approach lane,average vehicle delay time is minimized.