Research On Basic Methodology Of Bus Transit Network Design

The strategy of public transit priority is the most effective way to solve problems of urban transport. The conventional bus system is the basic part of public transit system. Reasonable bus routs network design ipmoses important impact on improving the service level of public transport system and its overall efficiency and optimizing urban traffic structure. But the exsisting transit system has a lot of problems, such as unreasonable overall network arrangement, low-level service and operation and so on, which are large1y caused by the unreasonable transit system planning. Bus transit network design (BTND), which directly affects passenger transport efficiency and public service level, is the first and most important step of the whole process of transit system planning. Hence, a discussion over BTND according to different travelling demands is necessary and urgent.In this paper, firstly the existing approaches of BTND are summarized and compared considering their advantages and disadvantages. Secondly, a new BTND approach for multiple-groups cities which combined traffic planning theory with urban morphology theory is put forward, and the bus transit network of Qinhuangdao is showed as an example to illustrate the approach. Thirdly, Ajustment planning of BTN has been raised since many cities begun to construct rail transit heavily. Through the analysis over of conventional bus functions in the public transit system, the features of rail transit stations and its land use and attracting area are illustrate to propose the adjustment method, detailed plan for Zhengzhou Rail Line1is carried out as a case example. Finally, the flexible transit planning for suburban districts is discussed. The optimal model that minimizes generalized cost is built under the assumption of grid road. Assuming the bus lines lay on the gride road network, the optimization model that the minimum total cost of agency and users is built. The softare MATLAB is used to solve the multi-objective problem, and the appropriate value for flexible transit is obtained.