Characterizing and distinguishing free and jammed traffic flows from the distribution and correlation of experimental speed data
Characterizing and distinguishing free and jammed traffic flows from the distribution and correlation of experimental speed data
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DOI：
10.1088/1367-2630/18/8/083022
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发表时间：
2016-08
影响因子：
3.3
通讯作者：
S. Tadaki;M. Kikuchi;A. Nakayama;A. Shibata;Y. Sugiyama;S. Yukawa
中科院分区：
文献类型：
--
作者：
S. Tadaki;M. Kikuchi;A. Nakayama;A. Shibata;Y. Sugiyama;S. Yukawa
从物理学的角度来看，交通堵塞的出现被认为是一个动力学相变。为了验证这一点，我们进行了一系列的电路实验。在之前的工作中，Tadaki等人（2013 New J. Phys 15 103034），我们确认了这种相变的发生，并通过分析基本图估计了自由流和堵塞流之间的临界密度。本文在基本流图分析的基础上，根据实验速度数据的分布和相关性，对自由流和阻塞流进行了表征和区分。我们发现，自由流中的速度不相关，其分布有一个狭窄的单峰平均。堵塞流的速度分布呈双峰或单峰分布。这两个峰值表示拥堵集群内部和外部的车速。宽单峰的出现是由于堵塞簇的出现和消失。我们还发现，堵塞集群的形成诱导了一个长期的相关性的速度。我们可以确定的大小堵塞集群和共存的堵塞集群之间的相对距离，从这个速度的相关性。
From a physics point of view, the emergence of a traffic jam is considered to be a dynamical phase transition. To verify this, we performed a series of circuit experiments. In previous work, Tadaki et al (2013 New J. Phys 15 103034), we confirmed the occurrence of this phase transition and estimated the critical density between free and jammed flows by analyzing the fundamental diagram. In this paper, we characterize and distinguish free and jammed flows, beyond the analyses of fundamental diagrams, according to the distribution and correlation of experimental speed data. We find that the speed in free flow does not correlate and its distribution has a narrow single peak at the average. The distribution of speed in jammed flow has two peaks or a single broad peak. The two peaks indicate the car speeds inside and outside of jam clusters. The broad single peak appears as a result of the appearance and disappearance of jam clusters. We also find that the formation of jam clusters induces a long correlation in speed. We can identify the size of jam clusters and the relative distance between coexisting jam clusters from this speed correlation.