2013年10月
Phase transition in traffic jam experiment on a circuit
NEW JOURNAL OF PHYSICS
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- 巻
- 15
- 号
- 開始ページ
- 103034 (20pp)
- 終了ページ
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1088/1367-2630/15/10/103034
- 出版者・発行元
- IOP PUBLISHING LTD
The emergence of a traffic jam is considered to be a dynamical phase transition in a physics point of view; traffic flow becomes unstable and changes phase into a traffic jam when the car density exceeds a critical value. In order to verify this view, we have been performing a series of circuit experiments. In our previous work (2008 New J. Phys. 10 033001), we demonstrated that a traffic jam emerges even in the absence of bottlenecks at a certain high density. In this study, we performed a larger indoor circuit experiment in the Nagoya Dome in which the positions of cars were observed using a high-resolution laser scanner. Over a series of sessions at various values of density, we found that jammed flow occurred at high densities, whereas free flow was conserved at low densities. We also found indications of metastability at an intermediate density. The critical density is estimated by analyzing the fluctuations in speed and the density-flow relation. The value of this critical density is consistent with that observed on real expressways. This experiment provides strong support for physical interpretations of the emergence of traffic jams as a dynamical phase transition.
- リンク情報
- ID情報
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- DOI : 10.1088/1367-2630/15/10/103034
- ISSN : 1367-2630
- Web of Science ID : WOS:000326269900003