Research On Reasonable Setting Of Traffic Flow Conditions For Expressway Freight Lanes

In recent years,with the development of China's transportation industry and the strengthening of the freight economy of the two places,the proportion of trucks in expressways is increasing day by day,and the size of trucks is also becoming larger and larger.The resulting mixed traffic conflict between passengers and goods is becoming more and more obvious.Lighter people will cause congestion in local road sections,and even lead to serial traffic accidents.Therefore,from the perspective of improving the traffic environment of expressways,it is necessary to consider setting up truck-only lanes when the traffic environment is complicated,and separating passenger and cargo vehicles from space,to reduce mutual interference.The paper will take the traffic flow conditions set by expressway truck lane as the research object,and explore the traffic flow size and structure through quantitative analysis,in order to provide reference indicators for the setting of truck lanes,which will have a strong practical significance for improving the traffic operation environment in close contact areas.Firstly,the paper analyzes the basic traffic characteristics of expressway trucks,including three aspects: truck's exterior parameters,dynamic performance and driving characteristics.Secondly,it analyzes the impact of trucks on highway traffic,traffic safety and environment,indicating that the truck is the main factors causing the deterioration of the road operating environment,and the necessity of implementing passenger and cargo separation is put forward;then,based on the influence relationship between roads,traffic and other factors and the setting of truck lanes,the influence of various factors on the target decision is discussed.The weights of each influencing factor are determined by using the analytic hierarchy process.Then,the simulation model of the truck lane is constructed by means of VISSIM platform.Combined with the simulation scheme design,the speed,delay and average lane change times are selected as the main indicators to evaluate the implementation effect of the truck lane.Through the comparison of the implementation effects of various schemes under the simulation operation,the traffic flow conditions of the truck lanes under the influence of different lane numbers and slopes are determined.Finally,the paper selects the Liaoyang-Anshan section of Shenda Expressway as the engineering case for verification analysis and simulation.Modular analysis Forecast,compared to truck lanes situation before and after the implementation of the evaluation to verify the accuracy of the conclusions of this study.From the perspective of quantitative analysis,considering the influence of specific road factors,this paper explores the reasonable setting of traffic flow conditions for expressway truck lanes,and provides a certain technical reference for the related research and implementation of truck lanes.