Study On The Optimization Of Actuated Signal Control Considering Queuing Vehicles At Intersections

The current signal control methods for the intersections are usually divided into timing control and actuated signal control,how to manage and control the intersections reasonably and effectively is still the focus of the research in nowadays.For the actuated signal control,it is a method to detect the real-time dynamic traffic information with the help of detectors for making the corresponding control decision for the intersection and then controlling the running state of the vehicle at the intersection.For the actuated signal control,its control parameters,phase scheme and phase control logic will affect the final control effect.At the same time,the actuated signal control should not only meet the traffic demand of traveling vehicles,but also weight the demand of queuing vehicles for the right of access.Based on the above analysis of the current development trend and demand of intersection signal control,this paper mainly carries the following research works:(1)Based on the theory of traffic wave,this paper establishes a vehicle queuing model,which describes the formation and dissipation process of vehicle queuing on the road section through the transmission law of traffic wave behind the stop line of the intersection,and lays a foundation for the study of the optimization method of actuated signal control considering the queuing vehicles.(2)This paper proposes the actuated signal control method considering the queuing vehicles and optimizes the actuated signal control from the perspectives of control parameters and phase control logic:1)Optimization of control parameters: this paper establishes the initial green light time optimization model,analyzes the dissipation and departure process of queuing vehicles at the intersection by using the vehicle queuing model and then determines the initial green light time calculation method;besides,it establishes the optimization model of the limit green light time,combining the phase structure characteristics and considering the longest queuing distance of queuing vehicles at the intersection to constrain the objective function.2)Optimization of phase control logic: this paper optimizes the actuated signal control phase scheme and proposes the optimization method of phase scheme based on dual-ring phase structure based on the analysis of most existing researches that have not optimized actuated signal control from the perspective of phase scheme;it puts forward the phase switch parameters considering the demand of access right of queuing vehicles at green traffic flow and red traffic flow,makes judgment through the phase switch parameters and discusses the decision-making method of phase switch in various cases;it optimizes the control process of actuated signal control and also optimizes the actuated signal control on the whole to achieve the goal of improving the signal control method of intersections.(3)The effectiveness of the proposed method is verified by the simulation platform.The optimization effects of control parameters,phase control logic and actuated signal control considering queuing vehicles are verified respectively by comparing case simulation experiment.(4)The conclusion is drawn based on the analysis of the test results which indicates that the optimization model of actuated signal control parameters and the optimization method of phase control logic have a certain optimization effect in reducing the intersection delay and queue length compared with the control group;the optimization method of actuated signal control considering the queuing vehicles is able to balance each flow direction at the intersections compared with the overall optimization effect and it can reduce to a certain extent the queue length of vehicles at the intersections.