| With the acceleration of the urbanization process in China and the rapid growth of car ownership,the demand for people’s transportation travel has also increased significantly,resulting in an imbalance between the supply and demand of the urban transportation system,the relatively lagging construction of transportation infrastructure,and the problem of urban traffic congestion.The contradiction between the development of urban public transportation is increasingly prominent.After research by experts at home and abroad,the public transport priority development strategy can effectively alleviate the problem of urban traffic congestion.On the one hand,public transportation has the characteristics of large traffic volume,low travel costs,low environmental pollution,and a high utilization rate of road resources.On the other hand,with the importance attached by the country to public transportation,public transportation has gradually strengthened its status in cities in recent years,and its development trend Good,the performance of traffic relief function is more and more obvious.The thesis takes the optimization of the current public transit network in the downtown area of Shenzhen as the research object.After consulting the relevant theories of bus line network optimization at home and abroad,further combed the basic content of bus line optimization design,bus line network optimization model and line evaluation indicators.Collect a large amount of basic data,build a basic database of public transportation based on Arc GIS software,evaluate the technical indicators of the current public transportation system in conjunction with relevant specifications,and then screen out unreasonable public transportation lines,and summarize the current problems of the public transportation system in the central city of Shenzhen.At the same time,the bus IC card swipe data is used to count the travel volume of bus stops and the passenger flow of bus lines.Finally,combined with the existing problems in the current bus system,a specific optimization plan is proposed for the layout of the bus network.Aiming at the existing bus lines,the urban road traffic network model is established according to the principle of the highest overall site efficiency,etc.,and the bus lines at all levels are optimized based on Transit Net software to obtain the bus line network optimization plan,optimize the unreasonable bus lines,and then improve the current bus Route direction,improve the layout of the bus line network.The results show that the overall level of the public transportation system in the central urban area of Shenzhen is good,but there are problems such as high line bypass distance,high repeatability of bus lines,and serious competition between conventional buses and rail transit.After optimization,all indicators of the bus line network in the study area have been significantly improved,the bus line repeat factor has been significantly reduced,and the bus station 500 meters range has achieved full coverage,effectively filling the bus blind area or weak area,and strengthening the connection between the areas.The average non-linear coefficient of the entire bus line network is significantly reduced,reducing detours and improving the efficiency of bus operation.The optimized bus line network can effectively alleviate the problems of road traffic pressure and serious competition between conventional buses and subways,and strengthen the ability of various bus travel modes to effectively connect. |
