Interconnectivity is a practical requirement for the integration and high-quality development of rail transit in China.This paper reviewed the multi-level rail transit system in the Guangdong-Hong Kong-Macao Greater Bay Area,reinterpreting the concept of interconnectivity.It conducted an analysis on the appropriate levels of interconnectivity that should be achieved among different rail transit tiers and their feasibility.Furthermore,it delved into the research question of whether direct cross-line operations should be adopted as a means to achieve interconnectivity.The findings are as follows:(1)Interconnectivity is categorized into four levels based on convenience:direct cross-line operations,fare zone interchange(metro transfer mode),non-fare zone interchange(national railway transfer mode),and physically separated interchange(self-transfer mode).(2)High-speed rail and urban rail transit should focus on seamless transfer connections;intercity railways(regional corridor type)and high-speed railways,as well as metropolitan intercity railways and suburban railways,are suitable for direct cross-line operations.(3)Four categories of evaluation indicators technical standards,transport demand,operational conditions,and economic benefits are selected.The evaluation functions of each indicator are analyzed,and a fuzzy comprehensive evaluation model based on genetic algorithms is constructed.By applying genetic algorithms to optimize the determination of indicator weights,the issue of weight dependence in binary evaluation indicators is addressed.(4)Taking the intercity railways in the Greater Bay Area as an example,a case study on lines implementing direct cross-line operations for interconnectivity is conducted.The computational results align with current actual engineering design plans.
Guangdong-Hong Kong-Macao Greater Bay Arearail transitinterconnectivitystandard identificationfuzzy comprehensive evaluationgenetic algorithm
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