Study On The Net Optimization Of Conventional Bus Transportation Based On Rail Transit

China is driving the urban rail transit construction rapidly. In the initial operation, the lines are usually laid on the main traffic corridor. With the competition and cooperation of metro and bus on the corridor, the bus lines should be adjusted and organized to strengthen the connection between two modes according to the transfer of passenger flow inside the system. This research has an important theoretical value and practical significance to promote the sustainable prior development of public transportation system with rail and bus transit network convergence.This paper studies the coordination theory about rail transit and bus. On the basis of comparing the characteristics of rail transit and bus, the way to dividing bus lines according to the different function are studied. The junction form of rail and bus transit network are studied with analysis of the spatial, competition and cooperation relations between them.The strategies of transit network adjustment are proposed(shift of network function and layout, rail and bus transit transport network convergence and adjustment of bus lines). The width of rail transit corridor analyzed; Bus lines selection criteria according to the function are studied, and then lines are classified; And then the adjustment measures, plans and sequences for each category are put forward.The lines attached road network selection criteria are studied considering grade, network and conditions; The generation set of candidate stops is studied with the spatial relation ship and cohesion among bus stops, terminals and metro; A lines generating model for selecting lines from the candidate set is built, which aims to maximize passenger traffic; Then the improved genetic algorithm is designed for solving the model. Finally, the proposed method is applied to an example to verify effectiveness.