Research on Optimization Strategies for Urban Rail Transit Line Network Planning in River Valley Bandshaped City as Xining

Objective: The increasing traffic congestion in RVB (river valley bandshaped) urban areas highlights the urgent need for developing largemedium capacity URT (urban rail transit) systems. URT serves as an indispensable choice to alleviate transportation challenges and support and guide urban development. It is aimed to formulate optimization strategies for URT line networks in RVB cities for effective URT line network precontrol. Method: Taking the typical RVB city of Xining as example and aligning with the overall landuse planning of Xining, the changes in the urban spatial structure of RVB cities, job distribution for highdensity population, and specific development characteristics such as high passenger flow intensity in urban river valley area, scarce road space resources, long travel distances, and high motorization ratios are analyzed. The 2014 version of Xining urban rail transit line network planning is evaluated and the future traffic development modes and passenger flow corridors are analyzed through modeling. Result & Conclusion: It is proposed that RVB cities should enhance connectivity timeliness by introducing overtaking stations, densifying lines, strengthening rail transit coverage in river valley area, optimizing layout scheme of transportation connection facilities, expanding the heartland, and strategically increasing population and job coverage along rail transit lines. Additionally, it is recommended to reserve connection space at the ′cross′shaped central rail transit interchange stations. For phased implementation, and the possibility of line network restructuring in the ′cross′shaped central area supported by transit lines should be precontrolled. It is suggested that the URT approving authorities for rail transit lines should prioritize passenger flow indicators over population and economic indicators, and policy flexibility in rail transit approval policies for RVB cities should be appropriately considered.