Analysis Of Road Traffic System In Xiong’an New Area Based On Virtual Simulation

With the rapid development of urbanization and motorization,the problem of "Metropolitan Diseases" mainly manifested in traffic jams has become increasingly prominent.Xiongan New Area adheres to the planning concept of "green travel,compatible and mixing,low-carbon and intelligence",and will provide a Chinese solution to the problem of "Metropolitan Diseases ".This thesis takes Xiongan New Area as the study object,and makes use of the virtual simulation software of Tran Star to analyze the road traffic system.The main research content includes the following aspects:First,sorted out the layout of urban space and functions and transportation planning of Xiongan New Area.In terms of spatial pattern,the Xiongan New Area presents the pattern of "one main,five group,multi-node" as a whole.Within each group,it conforms to the natural terrain and divides the group through natural boundaries such as green belts,rivers,and lakes to form the spatial pattern that has distinguishing feature.In terms of functional layout,Xiongan New Area coordinates the three major functions of production,life,and ecology,insists on mixed land development,and emphasizes the interaction between industry and city and the balance between work and housing.In terms of transportation system planning,Xiongan New Area strives to create a "slow travel + public transport" green travel mode,orderly guiding car travel to public transport travel.Secondly,aiming at the unique City Exchange Center(CEC)system in Xiongan New Area,the CEC function positioning,classification and design principles are summarized.Put forward the concept of CEC service capacity and give the calculation method,and analyze the efficiency of CEC service through two indicators: utilization rate and turnover rate.Analyzed the driver’s activity in CEC.Divided the time impedance of CEC into fixed impedance and queuing impedance.And the knowledge of queuing theory is used to calculate the queuing impedance of CEC.A CEC traffic impedance model based on queuing theory is established to provide support for model split and traffic assignment in the Xiongan New Area.Third,sorted out the characteristics of the road traffic system in the Xiongan New Area,and the number of lanes,lane widths,intersection spacing,and exclusive bus lane settings,and the market share of Connected and Autonomous Vehicle(CAV),that exert influences on the capacity of road section in Xiongan New Area,were analyzed based on them.Then,according to the relationship between road travel time and road traffic load,the travel time of bus lanes and non-bus lanes is analyzed to provide a basis for subsequent simulation parameter setting and simulation analysis.Fourth,Established the basic database of transportation in Xiongan New Area,and the traffic generation method based on the population and land use of the Xiongan New Area and dual-constrained gravity model were used to complete the trip generation prediction and trip distribution prediction.Using the CEC traffic impedance model to modify the car’s utility function,the changes in the car’s travel sharing rate under the setting of CEC are studied.The results show that after setting the CEC,the car’s sharing rate drops by 9.55%,the green transportation travel rate reaches 90.68%,and public transport accounted for 81.04% of motorized trips,which is in line with the new area’s "90/80" planning goals.Considering the CEC service capacity limitation,the OD matrix of car between zones is converted into the OD matrix between CEC,and then the analysis of motor vehicle traffic allocation is completed.The results show that after setting CEC,the overall traffic volume of the motor vehicle road segment drops significantly,and various traffic operation indicators are better than those without CEC.The thesis provides a complete set of simulation analysis process of urban new area road traffic system,which can provide support for the road network planning and traffic policy formulation of the Xiongan New Area,as well as provide reference for other new area road traffic system simulation analysis in China.