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arXiv 1408.2902physics.soc-ph
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交通流基本图中随机跃迁的影响

Effect of stochastic transition in the fundamental diagram of traffic flow

Adriano Francisco Siqueira, Carlos Jose Todero Peixoto, Chen Wu, Wei-Liang Qian

摘要:

在这项工作中,我们提出了一种替代的随机模型的基本图的交通流的参数最少。我们的方法是基于交通系统的车辆速度转换的动态中观观点。本方法的一个关键特征在于其随机性,这使得它不仅可以研究流量-浓度关系,即基本图,而且可以研究其不确定性,即基本图\textemdash的方差,这是所观察到的交通流数据的一个重要特征。结果表明,在简化版本的模型组成的只有几个速度状态,这两个量的解析解可以得到,这有利于讨论相应的物理内容。通过引入最大拥挤密度$k_{max}$,我们还证明了车辆大小的影响可以包括在模型中。利用该参数,自然地划分了自由流区和拥挤流区,并以流量-浓度关系最大值处的通行能力下降为过渡特征。模型参数,然后调整到观察到的交通流量的I-80高速公路数据集在旧金山地区的NGSIM程序,其中的基本图和它的方差是合理的再现。尽管它的简单性,我们认为,目前的模型提供了一种替代的描述的基本图和它的不确定性在交通流的研究。

英文摘要:

In this work, we propose an alternative stochastic model for the fundamental diagram of traffic flow with minimal number of parameters. Our approach is based on a mesoscopic viewpoint of the traffic system in terms of the dynamics of vehicle speed transitions. A key feature of the present approach lies in its stochastic nature which makes it possible to study not only the flow-concentration relation, namely, the fundamental diagram, but also its uncertainty, namely, the variance of the fundamental diagram \textemdash an important characteristic in the observed traffic flow data. It is shown that in the simplified versions of the model consisting of only a few speed states, analytic solutions for both quantities can be obtained, which facilitate the discussion of the corresponding physical content. We also show that the effect of vehicle size can be included into the model by introducing the maximal congestion density $k_{max}$. By making use of this parameter, the free flow region and congested flow region are naturally divided, and the transition is characterized by the capacity drop at the maximum of the flow-concentration relation. The model parameters are then adjusted to the observed traffic flow on the I-80 Freeway Dataset in the San Francisco area from the NGSIM program, where both the fundamental diagram and its variance are reasonably reproduced. Despite its simplicity, we argue that the current model provides an alternative description for the fundamental diagram and its uncertainty in the study of traffic flow.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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