Connors, RD orcid.org/0000-0002-1696-0175 and Watling, DP orcid.org/0000-0002-6193-9121 (2015) Assessing the demand vulnerability of equilibrium traffic networks via network aggregation. Networks and Spatial Economics, 15 (2). pp. 367-395. ISSN 1566-113X
Abstract
Studies of network vulnerability mostly focus on changes to the supply side; whether considering a degradation of link capacity or complete link failure. However, the level of service provided by a transport network is also vulnerable to increases in travel demand, with the consequent congestion causing additional delays. Traffic equilibrium models can be used to evaluate the influence of travel demand on level of service when interest is restricted to only a small number of pre-specified demand scenarios. A demand-vulnerability analysis requires understanding the impact of unknown future changes to any possible combination of OD demands. For anything but the smallest networks, this cannot be accomplished by re-computing network equilibrium at all possible demand settings. We require a representation of the functional relationship between demands and levels of service, avoiding the need to re-evaluate the equilibrium model. This process-of collapsing the demand and network representations onto a single, coarse-level network with explicit functional relationships-is referred to here as 'network aggregation'. We present an efficient method for network aggregation for networks operating under Stochastic User Equilibrium (SUE). In numerical experiments, we explore the nature and extent of the aggregation errors that may arise. © 2014 Springer Science+Business Media New York.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2014, Springer. This is an author produced version of a paper published in Networks and Spatial Economics. Uploaded in accordance with the publisher's self-archiving policy.The final publication is available at Springer via http://dx.doi.org/10.1007/s11067-014-9251-9 |
Keywords: | Demand vulnerability; Network aggregation; Sensitivity analysis; User equilibrium; Stochastic user equilibrium |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Environment (Leeds) > Institute for Transport Studies (Leeds) > ITS: Spatial Modelling and Dynamics (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 23 Sep 2014 11:30 |
Last Modified: | 26 Oct 2020 16:41 |
Published Version: | http://dx.doi.org/10.1007/s11067-014-9251-9 |
Status: | Published |
Publisher: | Springer |
Identification Number: | 10.1007/s11067-014-9251-9 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:80113 |