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An integrated measure of accessibility and reliability of mass transit systems

机译：衡量公共交通系统可及性和可靠性的综合措施

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摘要

The growth of a city or a metropolis requires well-functioning transit systems to accommodate the ensuing increase in travel demand. As a result, mass transit networks have to develop and expand from simple to complex topological systems over time to meet this demand. Such an evolution in the networks’ structure entails not only a change in network accessibility, but also a change in the level of network reliability on the part of stations and the entire system as well. Network accessibility and reliability are popular measures that have been widely applied to evaluate the resilience and vulnerability of a spatially networked system. However, the use of a single measure, either accessibility or reliability, provides different results, which demand an integrated measure to evaluate the network’s performance comprehensively. In this paper, we propose a set of integrated measures, named ACCREL (Integrated Accessibility and Reliability indicators) that considers both metrics in combination to evaluate a network’s performance and vulnerability. We apply the new measures for hypothetical mass transit system topologies, and a case study of the metro transit system in Seoul follows, highlighting the dynamics of network performance with four evolutionary stages. The main contribution of this study lies in the results from the experiments, which can be used to inform how transport network planning can be prepared to enhance the network functionality, thereby achieving a well-balanced, accessible, and reliable system. Insights on network vulnerability are also drawn for public transportation planners and spatial decision makers.
机译：城市或大都市的发展需要功能完善的公交系统来适应随之而来的旅行需求的增长。结果，随着时间的流逝，大众运输网络必须发展并从简单的拓扑系统扩展到复杂的拓扑系统，以满足这种需求。网络结构的这种演变不仅需要改变网络的可访问性，而且还需要改变部分站点以及整个系统的网络可靠性。网络可访问性和可靠性是已广泛用于评估空间网络系统的弹性和脆弱性的流行措施。但是，使用单一性（可访问性或可靠性）可提供不同的结果，因此需要一种综合性的方法来全面评估网络的性能。在本文中，我们提出了一套称为ACCREL（集成可访问性和可靠性指标）的集成措施，该指标综合考虑了两个指标以评估网络的性能和脆弱性。我们对假设的公交系统拓扑应用了新的度量，然后以首尔的地铁系统为例进行了研究，突出了四个演进阶段的网络性能动态。这项研究的主要贡献在于实验的结果，这些结果可用于告知如何准备传输网络规划以增强网络功能，从而获得一个平衡，可访问且可靠的系统。还为公共交通规划人员和空间决策者提供了有关网络漏洞的见解。

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