Interdependency in transportation system resilience: Review and discussion

The growing interconnectivity of transportation infrastructures amplifies system interdependencies and significantly influences system resilience during disruptive events. While these dependencies can offer backup routes and ensure service continuity, they also heighten the risk of widespread disruptions following a single failure. This paper provides a thorough examination of the literature on interdependency and resilience in transportation systems. The discussion begins with an exploration of the forms of interdependency in both single-modal and multi-modal transportation systems, delving into their definitions and the methodologies employed for their modeling. Subsequently, the paper analyzes the dual-edged impact of interdependency on transportation resilience, considering both its potential to enhance robustness and its propensity to exacerbate the consequences of disruptions. The review concludes with an assessment of the current limitations in understanding and addressing these issues, proposing future research directions aimed at developing more resilient transportation systems.