Research On Moving Bottleneck Traffic Flow Based On Multi Lane

With the development of our country,the demand for highway traffic volume continues to increase,and investment in the construction of transportation infrastructure has been increased.The construction of expressways has been developed rapidly,and the number of lanes has been expanded from two-way four-lane to two-way six-lane.8.With eight lanes,the expressway traffic volume has increased significantly,and the proportion of heavy-duty trucks has increased.In this context,the main cause of traffic flow disturbance has changed from external fixed factors affected by fixed bottlenecks such as ramps to internal mobile factors in traffic flow enhanced by the interaction between vehicles.The performance gap between heavy-duty trucks and cars will cause a "moving bottleneck" phenomenon in the expressway system,which will cause dynamic congestion in local traffic flows,resulting in loss of time and space resources.Studying the mechanism and form of "moving bottleneck",analyzing the disturbance law of moving bottleneck to traffic flow,and exploring its elimination measures will be of great significance to the development of highways in my country.This paper establishes and simulates the "moving bottleneck" model of multi-lane cellular automata to analyze its influence on traffic flow.The main results are summarized as follows:(1)First,summarize the research background of "mobile bottleneck" and the current research status at home and abroad.After summarizing the advantages and disadvantages of the research on "mobile bottleneck" at home and abroad,put forward the research ideas and research directions of the project.On the basis of condensed the technical roadmap of this article.(2)Analyze the causes of "moving bottleneck" from the internal disturbance of traffic flow.Based on the research of traditional road traffic bottleneck,analyze the formation mechanism of "moving bottleneck" and the main factors that disturb the traffic flow.Finally,The main research indicators such as traffic flow,average speed,congestion rate and lane change rate have been determined.(3)Based on the traditional two-lane NaScH model,analyze the model’s car-following rules and lane-changing rules,improve the traditional STCA lane-changing rules,add active lane-changing rules,and simulate the evolution of the update model.Establish model evolution rules.(4)Based on the traditional "mobile bottleneck" cellular automata traffic flow model,this paper adds indicators that reflect the power and braking performance of heavy-duty trucks and cars,and combines the characteristics of "mobile bottleneck" to establish a multi-lane cellular automata on the expressway.Machine model,the following results are obtained after simulation:In the absence of "moving bottleneck" interference,when the traffic density is small,the lane-changing behavior will increase the average vehicle speed and traffic flow.However,when the traffic density is greater than a certain value,the physical space of the road is compressed,and all vehicles on the lane will interact with each other.The impact between the two increases,resulting in similar speeds,the actual conditions for vehicle lane changing become harsher,the lane changing rate decreases,the average vehicle speed decreases,and the traffic volume begins to decrease.Different parameters have different sensitivity to the "moving bottleneck" effect under the same traffic flow density interval.In the low-density interval,the sensitivity of lane change rate is higher,and the sensitivity of average speed,traffic flow and congestion rate is low;in the medium-density interval,the sensitivity of average speed,traffic flow and lane change rate is higher,and congestion High rate sensitivity;high-density interval,high congestion rate sensitivity,low sensitivity of other indicators.There are four parallel combinations of different "moving bottleneck" vehicles.After dissipating,a "moving bottleneck" will be formed in a certain lane with two or more heavy-duty trucks driving.The acceleration and deceleration performance of the moving bottleneck vehicle will accelerate the dissipation.the process of.