Research On The Delay Analysis And Setting Conditions Of Directional Lanes On Urban Arterial Roads

Traditional traffic congestion management is mainly considered from the perspective of traffic supply,but the rapid increase in the number of cars has made the contradiction between traffic supply and demand increasingly prominent.The establishment of directional lanes can reduce traffic delays and congestion caused by vehicle lane changes,thereby improving the bottleneck section of traffic.effectiveness.Directional lanes prohibit vehicles from changing lanes,reduce lateral interference and interlaced delays of vehicles on the road section,increase the average speed of vehicles,and improve the efficiency of bottleneck sections.The thesis takes the reduction of road section delay as the goal,and takes the setting length of the directional vehicle road section and the traffic flow conditions as the research object.Through quantitative analysis of the setting conditions of the directional vehicle road section,it provides a theoretical basis for the setting of directional lanes,and has a higher reality for controlling congestion and improving road traffic efficiency significance.(1)This paper elaborates on the definition of directional lanes,setting methods,basic setting conditions,and impact on traffic from several aspects of directional lanes.According to the measured traffic flow data of the actual application section of the directional lane,the flow characteristics,speed characteristics and headway characteristics of the directional lane are analyzed theoretically and tested by fitting.The statistical data show that the impact of directional lanes on vehicle flow and speed is small during the flat hours,and there is a significant improvement on vehicle flow and speed during the peak hours.(2)Analyze lane-changing behavior and car-following behavior in terms of driving behavior,and expound its generation mechanism and influencing factors.Combining traffic wave theory and moving bottleneck theory,analyze the influence of directional lanes on road delays.Directional lanes can reduce the interlaced delays caused by lane changing.At the same time,the directional lanes prohibit vehicles from changing lanes,and the moving bottleneck delay caused by the mixed traffic of fast and slow vehicles The inevitable increase.The delay caused by vehicle lane change in the road section is divided into its own lane change delay and lane change interference delay,and the road section lane change delay model is established;the traffic flow under the moving bottleneck is analyzed,and the head distance model and the delay model under the moving bottleneck are established.(3)Based on VISSIM simulation software,build a simulation model of directional lanes,change the total traffic volume,the proportion of vehicles at the ramp and the proportion of slow vehicles,select speed and delay as the main indicators to evaluate the implementation effect of directional lanes,and run simulations under each plan The comparative analysis of the effects indicated that it is suitable to set the directional lanes when the average speed of vehicles on the road section is increased and the average delay is reduced,and the reasonable setting conditions for directional lanes under different lengths of road sections are determined.(4)Chongqing Gumufeng interchange,Grand Mansion interchange,Jiangnan Avenue directional lane as an engineering case for example analysis,through simulation modeling,comparison of the road section before and after setting directional lane operation effect,optimize the length of the road section setting,and put forward improvement measures for each directional lane.