Study On TheRoad Network Carrying Capacity Of Groupcity

With the expansion and development of urban size, polycentric urban development pattern depended disperses the urban traffic pressure more than to the heart, and to a great extent, alleviate the urban traffic pressure, safeguard the city's expansion and development, and thus gradually become a general trend of urban development pattern. However, with the development of traffic and city groups, each group of rivers, mountains and erosion of natural barrier has been broken, such as urban groups on the surface of the center appears to large area of congestion. At the same time, with common of urban land development process speeding up, the rapid development of city construction, the group network, such as transportation infrastructure cannot meet the increasing traffic demand, road network traffic load bearing capacity, the urban traffic system on hold their stable development is facing great pressure and challenge. Therefore, seeking group urban road network traffic limit bearing system, to ensure the safety of the urban traffic and orderly development, become the city traffic problem to be solved.Overall capacity of road network traffic capacity is based on the city road network traffic capacity of research methods, group of urban road network can be further divided into group fast channel between internal network and the group of two parts, the article will be applied to the bearing capacity of road network traffic research group for the first time on the urban road network, through computing group of city road network traffic capacity further determine bearing capacity of group city level, thus to restrict vehicle development scale and to provide theoretical reference for urban traffic safety can work properly.This paper studied the several calculation methods of the bearing capacity of road network traffic by comparing different methods of adaptability, to find a suitable for the study of the calculation method of the bearing capacity of road network, the consumption of time and space method; Group is studied, the characteristics of city road network and traffic, the group is analyzed from the Angle of macroscopic internal road network traffic flow, velocity and density of traffic flow characteristics, and further analyzes the fast channel between groups of vehicle delay and queuing traffic flow characteristics; Using the method of space and time consumption group and bearing capacity of urban road network traffic model, the model is divided into group internal road network traffic capacity and intra-group fast track traffic bearing capacity of two parts, and refer to thetransportation service level hierarchy, the bearing capacity of road network is divided into four levels, and to evaluate the bearing capacity of road network status; Finally to group in nanan distract of chongqing city as the background, nanan distract group road network capacity by calculation to verify the feasibility and validity of the model.The research paper can measure group network bearing level of urban road network system, from intuitively understand the current situation of urban road network carrying case, by controlling the reasonable operation speed of urban traffic, to reach the bearing capacity of road network, the largest offers a new perspective and methods for traffic management.