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An empirical analysis on the arterial fundamental diagram

机译：动脉基本图的实证分析

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For uninterrupted traffic flow, it is well-known that the fundamental diagram (FD) describes the relationship between traffic flow and density under steady state. For interrupted traffic flow on a signalized road, it has been recognized that the arterial fundamental diagram (AFD) is significantly affected by signal operations. But little research up to date has discussed in detail how signal operations impact the AFD. In this paper, based upon empirical observations from high-resolution event-based traffic signal data collected from a major arterial in the Twin Cities area, we study the impacts of g/C ratio, signal coordination, and turning movements on the cycle-based AFD, which describes the relationship between traffic flow and occupancy in a signal cycle. By microscopically investigating individual vehicle trajectories from event-based data, we demonstrate that not only g/C ratio constrains the capacity of a signalized approach, poor signal coordination and turning movements from upstream intersections also have significant impact on the capacity. We show that an arterial link may not be congested even with high occupancy values. Such high values could result from queue build-up during red light that occupies the detector, i.e. the Queue-Over-Detector (QOD) phenomenon discussed in this paper. More importantly, by removing the impact of QOD, a stable form of AFD is revealed, and one can use that to identify three different regimes including under-saturation, saturation, and over-saturation with queue spillovers. We believe the stable form of AFD is of great importance for traffic signal control because of its ability to identify traffic states on a signal link.
机译：对于不间断的交通流，众所周知，基本图（FD）描述了稳态下交通流与密度之间的关系。对于信号道路上的交通中断，已经认识到，信号的操作会严重影响动脉基础图（AFD）。但是到目前为止，很少有研究详细讨论信号操作如何影响AFD。在本文中，基于从双城地区主要动脉收集的高分辨率基于事件的交通信号数据的实证观察，我们研究了g / C比，信号协调和转弯运动对基于周期的信号的影响AFD，它描述信号周期中流量与占用之间的关系。通过从基于事件的数据微观调查单个车辆的轨迹，我们证明，不仅g / C比限制了信号化方法的容量，不良的信号协调性和来自上游交叉口的转弯运动也对容量产生了重大影响。我们显示，即使占用率较高，动脉连接也可能不会拥塞。如此高的值可能是由占用检测器的红灯期间的队列建立导致的，即本文讨论的检测器队列（QOD）现象。更重要的是，通过消除QOD的影响，揭示了一种稳定的AFD形式，并且可以使用它来识别三种不同的机制，包括队列溢出的欠饱和，饱和和过饱和。我们认为，稳定的AFD形式对于交通信号控制至关重要，因为它能够识别信号链路上的交通状态。

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