Research On Optimization Method Of Bus Network In The Near Future

One of the fundamental contents of priority for public transport is to optimize the bus network, it is the basis for developing the public transport system service level and competition. The short-range optimization of the public transport route network has its specificity that is different from the long-range planning and the optimization of the current public transport route network, and whose research objects are concerned with both the net structure optimization at the macro level and the individual bus line adjustment at the micro level.This paper divided bus network optimization into three parts to discuss: public transport demand forecast the short-range optimization mode of the bus network and the optimization technique of the current bus network.Public transport demand forecast is the foundation upon the bus network optimization. Restricted within Traditional Four-Step Process frame, this paper systernicaiiy studies the method and model of trip distribution forecast firstly. Then, by comparing with the limitation of these methods and aiming at overcoming the disadvantage of Gravity-model which is widely used, this paper introduces the idea of 'layered distribution' about trip distribution forecast. Secondly, the layered principle and layer classification method are presented.Based on the study of the specificity of recent planning, the historical reason for that the bus networks in mostly cites in China and the problems existing in the nowadays bus network construction, the paper structures the short-range optimization mode of the bus network subsequently. And then the practical strategy flow by combining the macroscopical mode and the microcosmic adjustment together are provided.After studying the mode of recent bus network optimization, the paper analyses the practical method for short-range bus network optimisation based on the public traffic service districts, and offers the dividing principles and defining methods out to these districts. At last, the practical method of optimisation and adjustment for present status is provided. Combing the cluster analysis for present statue adjustment, this paper gives the evaluating indicator for adjustment firstly, and then investigates systematically the adjustment principle and method for busnetwork, and finally, findings integrates each part and provides the current bus network adjustment program and applied these methods on Shenzhen.