Transfer Coordination Of Surrounding Bus At The Terminal Metro Station During Peak Period

With the development of the city,the conventional bus system gradually lags behind and cannot meet the continuous growth of people’s travel demand.As the development of the construction of urban rail transit,especially the metro,passenger flow is transferred to the urban rail transit system with medium and high capacity,in order to share the passenger volume of bus overload,meanwhile the saturation of road space can be reduced and the operating space of bus can be ensured to improve its level of service.This paper mainly optimizes the transfer coordination between the metro and the bus at terminal metro station from two aspects of spatial layout and transfer time.Firstly,the positioning and service functions of metro and bus in the urban public transportation system are compared and analyzed,and the concept of the service area of the terminal metro station is proposed,which provides a theoretical basis for later spatial adjustment of bus stop layout.Combined the existing transfer situation between metro and bus,the characteristics of transfer passenger flow between metro and the surrounding bus at terminal metro station are analyzed based on the spatiotemporal distribution,transfer mode,flow characteristics,etc.Secondly,the spatial layout of bus stops surrounding metro station is optimized.Based on the analysis of regional network transfer in the graph theory and multi-level travel coverage of urban rail transit stations,the location relationship between the entrances and exits of metro station and bus stops is developed,the regional stations are optimized with the objective of minimizing the total transfer walking distance,and the layout of the optimized transfer system is evaluated and analyzed.Then,based on the spatial layout optimization scheme of the surrounding bus stops,the distribution characteristics of passenger transfer walking time are analyzed with the Weibull distribution.The mathematic model is developed to optimize the bus operation schedule with the objective of minimizing the total passenger transfer time,which is solved by genetic algorithms.Finally,the real-world data from the terminal station Youfangqiao Station of Nanjing Metro Line 2 are applied to verify the feasibility and effectiveness of the proposed model.Based on the existing situation of the surrounding bus stops at Youfangqiao Station,the location layout and operating schedule of the bus stops are optimized,Both the total transfer time and the average transfer time in the studied period are compared by before and after optimization.Taking bus route 182 at the Youfangqiao bus station as an example,the result shows that with the optimized departure time scheme the total transfer time reduced about47.8% and the average transfer time can be saved by 93.6s,compared with the existing situation.The transfer efficiency is obviously.