Research On Multi-Point Bottleneck Linkage Signal Control Method

In recent years,urban traffic congestion has become more and more serious,many intersections are often in the state of saturation during peak period,some of the import road segment length exceeds the length of the road section,causing queuing up phenomenon,resulting in the upstream intersection lock,seriously affecting the overall road network of the operating efficiency is not conducive to establish a good image of good city.Traffic signal control is one of the most important means to relieve traffic congestion.The low cost and high efficiency of traffic signal control is more valuable than constructing new traffic roads.The traditional signal control technology is mainly based on single-point fixed-cycle,mulch-time program control of the main signal control,the algorithm is mainly based on the import channelization program and traffic optimization intersection signal timing parameters,to ensure junction safety,efficiency and fairness play an irreplaceable role.However,the traditional signal control technique has good effect in the middle and low saturation state,but it is not applicable in the condition of high saturated traffic flow and can not effectively restrain the occurrence of queuing up situation.In order to effectively alleviate the traffic congestion situation,the urban road network signal control scheme should take full consideration of the "bottleneck" phenomenon during the peak period,coordinate the bottleneck of the bottleneck as far as possible from the source of traffic demand,prevent queuing transfer,The traffic management system must identify the queuing up phenomenon quickly and accurately,and make sure that the traffic flow in other direction can be accepted by the traffic signal.In order to reduce the negative impact of queuing up to the upstream area,Parameter adjustment quickly dissipates road bottlenecks.In this paper,the upper reaches of the region as the control object to a certain time to dissipate bottlenecks for the control of the target section,focusing on bottleneck identification methods and bottleneck control algorithm,the following two aspects of the focus of research.(1)Bottleneck recognition method based on downstream section data Firstly,based on the bottleneck identification method based on rolling time occupancy,a new bottleneck algorithm structure is proposed.Secondly,the abnormal bottleneck and normal bottleneck are analyzed by VISSIM simulation.Finally,the accuracy of the new method under the different damage rate of the link sensor is simulated by simulation,which provides the theoretical premise for the bottleneck control scheme.(2)The bottleneck control algorithm based on OD data is based on OD data to establish the key vehicle flow path and controllable road segment search method to induce the bottleneck of road section,to determine the bottleneck control node;to take the upstream area as the control object,to dissipate the road section within a certain time.The bottleneck is the control target,the total adjustment amount of the incoming flow is estimated,and the allocation method of the adjustment amount between the controllable road sections is established based on the remaining capacity of the link,and the signal scheme of the control node is optimized.Based on the actual data of Guiyang city,the bottleneck trigger is used as the index,and the control effect of the model is verified by VIS SIM simulation.The results show that the maximum queue length of the bottleneck section is lower than that of the conventional control scheme 31.39%,the regional car delays were reduced by 26.00%.