An Interactive Traffic Signal Optimization Approach with Dynamic Variable Guidance Lane Control

Abstract

The purpose of setting up variable guidance lanes is to ease the traffic pressure on lanes with more traffic under the condition of ensuring the traffic capacity of the intersection. This study proposes a bi-level model-interactive relationship between variable guidance lane design and signal control and carry out a case study for a road in Wuhan, China. The design plan for the goal, combined with the design plan of the variable guidance lane, optimizes the signal timing plan of the intersection. A real case is modeled in VISSIM to simulate the design scheme of variable guidance lanes to verify the reliability and effectiveness of the bi-level model. The results showed that the average vehicle delay at the intersection was reduced by 20.65% after the bi-level model was optimized. The average error between model calculation results and simulation results is 9.88%. Moreover, the influencing factors of the proposed model are also carried out. The results show that when the traffic flow is greater than 1,000 pcu/h, the optimization effect of the model is more significant. When the traffic capacity gradually increases, the average vehicle delay calculated by the model is smaller. The design scheme and signal timing scheme proposed by the bi-level model can ensure the overall traffic efficiency of the intersection, improve the traffic efficiency of the traffic-stressed lanes, and further promote the space-time resource utilization of the intersection, optimize the space-time resources of the road network, and provide a scientific basis and new ideas and methods.

A Collaborative Method on Reversible Lane Clearance and Signal Coordination Control in Associated Intersection

“…based on the delay and queue length model, the optimization of signal timing by combining with available phase green time, available phase red time, reversible lane function switching control, and other factors has not been fully considered. Meanwhile, the sensitivity and efectiveness of feedback after applying the optimization models have not been investigated [1].…”

“…For intersections, signal control schemes can optimize the dynamic distribution of time resources, which is often limited by static spatial resources. However, even though the signal control timing is optimized, the corresponding improvement is very limited [1]. Terefore, the reversible trafc management is an important approach which can efectively combine signal timing and lane functions to solve the unbalanced problem of diferent turning directions of trafc fows at intersections.…”