Research On Intersection Signal Optimization Supporting Dynamic Control Of Variable Left-Turn Lanes

Road congestion has always been an urgent problem for urban traffic managers.Intersections are the junctions of roads connecting major cities.The uneven distribution of left-turn traffic and straight-through traffic at the intersection will lead to congestion at the intersection.One solution to this problem is to have variable left-turn lanes.The variable left-turn lane is prone to vehicle stagnation.If the stranded vehicles are not cleared in time,the left-turn traffic flow and the straight-through traffic flow will conflict,which will increase the congestion at the intersection.This paper focuses on two types of variable left-turn lanes to solve the problem of unbalanced distribution of left-turn and straight-through traffic.The main research work is as follows:(1)Based on the analysis of the traffic flow in the reverse variable lane at the exit,the lane setting conditions are analyzed.And the dynamic control scheme of the reverse variable lane at the exit is studied,including the comparative analysis of the existing control methods,the establishment of the dynamic optimization system,and the setting of the corresponding monitoring and induction system.An optimization model with the goal of minimizing the average vehicle delay at the intersection is established,and the coordinated optimization scheme of dynamic control and signal control of the reverse variable lane at the exit of the intersection is obtained.(2)Based on the analysis of the traffic flow operation rules of the intersection based on the control of the same-direction variable lanes at the entrance,the lane setting conditions are analyzed.The research of the lane dynamic control method and the intersection signal optimization of the dynamic control of the same-direction variable lane at the entrance are carried out,and the corresponding detectors are configured.(3)On the basis of the first two parts,the intersection signal optimization of the combined dynamic control of two variable left-turn lanes is studied.Firstly,the setting conditions of variable left-turn lane combination control are analyzed from three aspects:road,flow and signal timing.Then,the threshold value judgment of whether the variable lane can be optimized for combined dynamic control.And the research on the intersection signal optimization supporting the dynamic control of the variable left-turn lane combination is carried out.Finally,the corresponding detectors are laid out.(4)Instance application and effect evaluation of left-turn variable lanes.First,the collection of relevant parameters of the fork and the actual analysis of the existing problems are carried out.Then it is judged whether the combined dynamic control of the two variable left-turn lanes can be performed at the same time,and then the model is applied.Finally,the evaluation and comparative analysis of the intersection operation effect supporting the dynamic control of the variable left-turn lane combination is carried out.