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Alpha-reliable combined mean traffic equilibrium model with stochastic travel times

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Abstract

Based on the reliability budget and percentile travel time (PTT) concept, a new travel time index named combined mean travel time (CMTT) under stochastic traffic network was proposed. CMTT here was defined as the convex combination of the conditional expectations of PTT-below and PTT-excess travel times. The former was designed as a risk-optimistic travel time index, and the latter was a risk-pessimistic one. Hence, CMTT was able to describe various routing risk-attitudes. The central idea of CMTT was comprehensively illustrated and the difference among the existing travel time indices was analyzed. The Wardropian combined mean traffic equilibrium (CMTE) model was formulated as a variational inequality and solved via an alternating direction algorithm nesting extra-gradient projection process. Some mathematical properties of CMTT and CMTE model were rigorously proved. Finally, a numerical example was performed to characterize the CMTE network. It is founded that that risk-pessimism is of more benefit to a modest (or low) congestion and risk network, however, it changes to be risk-optimism for a high congestion and risk network.

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Correspondence to Wei Guan  (关伟).

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Foundation item: Project(2012CB725403-5) supported by National Basic Research Program of China; Project(71131001-2) supported by National Natural Science Foundation of China; Projects(2012JBZ005) supported by Fundamental Research Funds for the Central Universities, China; Project(201170) supported by the Foundation for National Excellent Doctoral Dissertation of China

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Zhang, Wy., Guan, W., Song, Ly. et al. Alpha-reliable combined mean traffic equilibrium model with stochastic travel times. J. Cent. South Univ. 20, 3770–3778 (2013). https://doi.org/10.1007/s11771-013-1906-z

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  • DOI: https://doi.org/10.1007/s11771-013-1906-z

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