Journal
PAPERS SELECTED FOR POSTER SESSIONS AT THE 21ST INTERNATIONAL SYMPOSIUM ON TRANSPORTATION AND TRAFFIC THEORY
Volume 9, Issue -, Pages 283-302Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.trpro.2015.07.016
Keywords
redundancy; travel alternative diversity; network spare capacity
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Redundancy is vital for transportation networks to provide utility to users during disastrous events. In this paper, we develop two network-based measures for systematically characterizing the redundancy of transportation networks: travel alternative diversity and network spare capacity. Specifically, the travel alternative diversity dimension is to evaluate the existence of multiple modes and effective routes available for travelers or the number of effective connections between a specific origin-destination pair. The network spare capacity dimension is to quantify the network-wide residual capacity with an explicit consideration of travelers' mode and route choice behaviors as well as congestion effect. They can address two fundamental questions in the pre-disaster transportation system evaluation and planning, i.e., how many effective redundant alternatives are there for travelers in the event of a disruption? and how much redundant capacity does the network have? To implement the two measures in practice, computational methods are provided to evaluate the network redundancy. Numerical examples are also presented to demonstrate the features of the two redundancy measures as well as the applicability of the computational methods. The analysis results reveal that the two measures have different characterizations on network redundancy from different perspectives, and they can complement each other by providing meaningful information to both travelers and planners. Published by Elsevier B.V.
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