Research On Comprehensive Treatment Of Medium Sized Cities

At present,the medium-sized cities in China are facing the development trendency of urban agglomeration and urban-rural overall development.The rapid growing of urbanization and urban traffic characteristics in urban agglomeration areas have affected not only the system of existing urban traffic management,transportation infrustructure construction and investment,but also the mode of inter-city traffic organization focused on roads.The construction speed of the road traffic system in China's medium-sized cities generally lags behind the development speed of the urban economic level and the growth rate of the number of motor vehicles.With the rapid growth of cars in recent years,urban public transport is furtherly limited.implementing comprehensive transportation governance and modernizing the transportation governance system and governance capacity are conducive to the urban transport system.It will also ease the increasingly serious traffic contradictions in the medium-sized cities.The paper analyzes the characteristics of traffic demand in medium-sized cities from the aspects of trip volume,trip destination,trip structure,travel time distribution,travel distance,and travel time consumption,and analyzes the traffic supply of medium-sized urban road systems,public transportation systems,and non-motorized systems.The paper also discussed the characteristics of the unstable point of traffic operation,and the reasons for the occurrence and the location of the vulnerable.It also summarizes and analyzes the key issues in the development of traffic in medium-sized cities.The connotation of the modernization of transportation governance capacity of mediumsized cities was analyzed,the overall goal of comprehensive transportation governance in medium-sized cities was defined,and the comprehensive governance target system for traffic was constructed.The principle of comprehensive urban transportation governance was put forward.A comprehensive governance system for medium-sized urban traffic was constructed from four aspects of governance system mechanism,governance legal system,governance key technology system,and planning and construction index system.The characteristics of these aspects and improving methods in the relevant areas.Based on the research of the indicator system for the medium-sized urban traffic planning and construction,this paper focuses on the two indicators of the road grading ratio and the average distance between the trunk road network in the center of a medium-sized city.Through the electronic cloud model of residents' travel distribution,the traffic demand of different modes of transportation undertaken by each level of road was calculated,and the total supply of roads was calculated by the supply of total space-time resources of roads and the consumption of space-time resources of individual trips,and a reasonable road grading structure for a mediumsized city was calculated by the balance of traffic supply and demand..After analyzing the optimal service radius of public transportation in central urban areas and proposing the appropriate bus station coverage rate,the average distance between bus-oriented trunk road networks in the center of a medium-sized city was studied.This paper defines the scope of service hinterland for high-speed rail hubs in mediumsized cities,and divides the space hierarchy into three levels: direct service area,major service area,and radiation-affected area.It also analyzes the functional requirements of the collection and distribution road network at each spatial level,and studies each Hierarchical road network system composition.Finally,it proposes a network layout method for collecting and dissecting roads at each spatial level,and studies the connection mode of road networks among various levels.