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Adjacent lane dependencies modulating wave velocity on congested freeways-An empirical study
Transportation Research Part B: Methodological ( IF 5.8 ) Pub Date : 2020-10-23 , DOI: 10.1016/j.trb.2020.10.005
Benjamin Coifman , Balaji Ponnu

Much of traffic flow theory and highway design is based upon the fundamental relationship, FR, between speed, flow, and density. Traditionally, the FR is assumed to be a static curve over time and space. This paper presents new empirical findings that show the FR in one lane of a freeway can actually change shape in a rapid and systematic response to conditions in the adjacent lanes. This paper demonstrates the dependencies for a general purpose freeway lane that is operating in the congested regime. The drivers become more conservative in response to slower speeds in either adjacent lane, conversely, they become less conservative in response to higher speeds in either adjacent lane. It is also shown that as drivers become more conservative the signals and waves move upstream slower. So this inter-lane dependency has a direct impact on how fast signals propagate through the traffic stream. For the study site the empirical relationship between the wave speed and relative speed is close to linear. This interdependence between lanes is an important factor that it is absent from most traffic flow and car following models. Given these findings the discussion explores hypothetical examples showing how the inter-lane dependencies can give rise to mechanisms for waves in adjacent lanes to synchronize, as well as a mechanism for a queue spreading from one lane to another without any lane change maneuvers. Finally, this work closes with an exploration of the possible physiological mechanisms that might be occurring in the drivers.



中文翻译:

拥挤高速公路上相邻车道依赖性调节波速的实证研究

交通流理论和高速公路设计大部分都是基于速度,流量和密度之间的基本关系FR。传统上,FR被假定为随时间和空间的静态曲线。本文提出了新的经验发现,表明高速公路一个车道的FR实际上可以对相邻车道的状况做出快速而系统的响应,从而改变形状。本文演示了在拥挤状态下运行的通用高速公路车道的依赖性。驾驶员对任一相邻车道的速度较慢的响应变得更加保守,相反,他们对相邻车道的较高速度的响应变得较不保守。还显示出,随着驾驶员变得更加保守,信号和波浪向上游移动的速度变慢。因此,这种车道间的依赖性直接影响信号在业务流中传播的速度。对于研究地点,波速和相对速度之间的经验关系接近线性。车道之间的这种相互依赖性是一个重要因素,大多数交通流和汽车跟随模型都没有这种关系。考虑到这些发现,讨论将探索假设示例,这些示例显示了车道间的依赖性如何引起相邻车道中的波同步的机制,以及无需任何车道变更操作即可从一个车道扩展到另一个车道的队列机制。最后,这项工作以探索可能在驾驶员中发生的可能生理机制作为结尾。对于研究地点,波速和相对速度之间的经验关系接近线性。车道之间的这种相互依赖性是一个重要因素,大多数交通流和汽车跟随模型都没有这种关系。考虑到这些发现,讨论将探索假设示例,这些示例显示了车道间的依赖性如何引起相邻车道中的波同步的机制,以及无需任何车道变更操作即可从一个车道扩展到另一个车道的队列机制。最后,这项工作以探索可能在驾驶员中发生的可能生理机制作为结尾。对于研究地点,波速和相对速度之间的经验关系接近线性。车道之间的这种相互依赖性是一个重要因素,大多数交通流和汽车跟随模型都没有这种关系。考虑到这些发现,讨论将探索假设示例,这些示例显示了车道间的依赖性如何引起相邻车道中的波同步的机制,以及无需任何车道变更操作即可从一个车道扩展到另一个车道的队列机制。最后,这项工作以探索可能在驾驶员中发生的可能生理机制作为结尾。考虑到这些发现,讨论将探索假设示例,这些示例显示了车道间的依赖性如何引起相邻车道中的波同步的机制,以及无需任何车道变更操作即可从一个车道扩展到另一个车道的队列机制。最后,这项工作以探索可能在驾驶员中发生的可能生理机制作为结尾。考虑到这些发现,讨论将探索假设示例,这些示例显示了车道间的依赖性如何引起相邻车道中的波同步的机制,以及无需任何车道变更操作即可从一个车道扩展到另一个车道的队列机制。最后,这项工作以探索可能在驾驶员中发生的可能生理机制作为结尾。

更新日期:2020-10-30
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