Traffic jams, granular flow, and soliton selection
- 1 July 1995
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review E
- Vol. 52 (1), 218-221
- https://doi.org/10.1103/physreve.52.218
Abstract
The flow of traffic on a long section of road without entrances or exits can be modeled by continuum equations similar to those describing fluid flow. In a certain range of traffic density, steady flow becomes unstable against the growth of a cluster, or ‘‘phantom’’ traffic jam, which moves at a slower speed than the otherwise homogeneous flow. We show that near the onset of this instability, traffic flow is described by a perturbed Korteweg–de Vries (KdV) equation. The traffic jam can be identified with a soliton solution of the KdV equation. The perturbation terms select a unique member of the continuous family of KdV solitons. These results may also apply to the dynamics of granular relaxation.Keywords
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