Exact and grid-free solutions to the Lighthill-Whitham-Richards traffic flow model with bounded acceleration for a class of fundamental diagrams

Shanwen Qiu, Mohamed Ewis Abdelaziz, Fadl Hicham Fadl Abdel Latif, Christian G. Claudel

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

In this article, we propose a new exact and grid-free numerical scheme for computing solutions associated with an hybrid traffic flow model based on the Lighthill-Whitham-Richards (LWR) partial differential equation, for a class of fundamental diagrams. In this hybrid flow model, the vehicles satisfy the LWR equation whenever possible, and have a constant acceleration otherwise. We first propose a mathematical definition of the solution as a minimization problem. We use this formulation to build a grid-free solution method for this model based on the minimization of component function. We then derive these component functions analytically for triangular fundamental diagrams, which are commonly used to model traffic flow. We also show that the proposed computational method can handle fixed or moving bottlenecks. A toolbox implementation of the resulting algorithm is briefly discussed, and posted at https://dl.dropbox.com/u/1318701/Toolbox.zip. © 2013 Elsevier Ltd.
Original languageEnglish (US)
Pages (from-to)282-306
Number of pages25
JournalTransportation Research Part B: Methodological
Volume55
DOIs
StatePublished - Sep 2013

ASJC Scopus subject areas

  • Management Science and Operations Research
  • Transportation

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