Research On The Bandwidth-based Arterial Signal Coordination Control Of Key Left-turntraffic Flow Collaborative Optimization

The Bandwidth-based Arterial Signal Coordination control plays an important role in improving the traffic efficiency of the arterial road.Based on the classical MAXBAND model and the extended MULTIBAND model,it is widely used in traffic management and control.However,on the one hand,the two types of models are based on symmetric release,which results in the obstruction of the left-turn traffic flow in the arterial road,and then affects the coordination system.On the other hand,a lapping phase optimization method based on left-turn and straight-part cooperative release is proposed.However,the research on single-entry release mode of left-turn and straight-line coordination is insufficient,which limits the optimization range of critical left-turn traffic flow phase sequence.The applicability of complex channelization schemes at intersections is inadequate,such as the existence of straight left lanes in the entrance roads.At the same time,the existing model is based on the arterial road composed of intersections,and the research on the key left-turn traffic flow collaborative optimization of T-shaped intersection at the end of the arterial road is insufficient.In addition,there is little research on the initial queue emptying time in the existing improved methods,which leads to the instability of the green wave bandwidth in the solution of the model.In order to solve the above problems,the key left-turn traffic flow,which affects the efficiency of intersection and green wave coordination,is taken as the constraint parameters of the optimization model,and the discriminant rules of key left-turn traffic flow are put forward.Then,on the basis of the study of phase sequence of green wave model,the combination range of left turn traffic flow and direct traffic flow is expanded,the single-inlet release analysis of left-turn and straight-line coordination of arterial road is added.In this paper,a mathematical expression describing the cooperative release mode of left turn is derived,and combined with the mathematical expression of lap phase,a phase sequence combinatorial expression is established to describe the cooperative optimization of critical left turn traffic flow at a crossroads.In addition,the key left-turn traffic flow at T-shaped intersection is analyzed,and the phase sequence combination expression for describing the critical left-turn traffic flow at T-shaped intersection is established.Then,the integrated Arterial road with T-shaped intersection at the end of the road is proposed as the research object,and the initial queue emptying time is considered to optimize the left-turn traffic flow on the intersecting road.Then the time-distance diagram model of the integrated Arterial road is established,and the combination expression of the key left-turn traffic flow release mode is introduced into the constraint condition of the MULTIBAND model for the adjacent intersection,as well as the intersection and the T-type intersection at the end of the road,respectively.Based on the optimization of constraint conditions and taking the maximum sum of bi-directional bandwidth weights as the control objective,a Bandwidth-based comprehensive Arterial Signal Coordination model for key left-turn traffic flow collaborative optimization is established,and the traditional MULTIBAND model is optimized.Finally,the example analysis is carried out,the coordinated control scheme is solved by using the MULTIBAND model and the Optimization model,and the green wave timedistance diagram is drawn for comparison and analysis,and the simulation system of the arterial road is established by using VISSIM11.The indexes of average parking times,average travel time and average delay are compared and evaluated.The results show that the coordinated control scheme generated by the optimized model is effective,which verifies the effectiveness of the proposed method in the improvement of the model.