Fully-actuated Signal Control At Isolated Intersections Based On Multi-target Tracking Radar

With the development of economy and society,the traffic congestion problems in the central areas of major cities at home and abroad are still serious.As an important node of the urban road network,intersections are main places where urban road congestion occurs.Signal control for isolated intersections is the basis of signal control for arterials and even areas.Full-actuated signal control is an advanced form of isolated signal control.For the traditional full-actuated control methods for isolated signals that use cross-section detection technology and terminate phases based on the vehicle’s time headway,they "will extend the green time for slow or stationary vehicles in the approach lanes","will extend the green time for continuously vehicle arrivals on individual approach lane,and "will take time to confirm that no subsequent vehicles arrive and then cut off the green".Aiming at these shortages,multi-target tracking radar detectors are deployed at the exit of intersections to collect the vehicle state data.The concept of vehicle safety extension length is presented to construct the concept of real-time utilization of approach lanes for each phase.Based on real-time utilization of approach lanes for each phase,the actuated control logic rules are designed,and a novel full-actuated isolated signal control method is developed.Orthogonal tests are executed in simulation environment,using variance analysis and intuitive analysis,with the average vehicle delay at the intersection as the main evaluation index,the control method proposed in this article is investigated considering the scenarios of different number of approach lanes,length of approach lanes,traffic demand level,heavy vehicle proportion.and its intersection performance is compared with the conventional method based on the vehicle headway.The results show that the proposed method can adapt to the changes of the above-mentioned various traffic conditions,and can achieve about 4% ~ 18% improvement of the vehicle delay at the intersection,compared with the traditional method.This improvement can be larger in the case of more approach lanes.However,the above advantages of the proposed method are lost for intersections that have the characteristics of fewer approach lanes,shorter approach lanes,greater traffic demand,and more heavy vehicles.