Abstract
Abstract This paper modeled and analyzed the queue length estimation mechanisms by different layout strategies. According to the lane allocations of intersections, several feasible layout strategies of magnetic sensors are proposed. Furthermore, a layout strategy with one single magnetic sensor is proposed to estimate the queue length. Specifically, three single-sensor based estimation methods were presented, which are: Tail Interval-based Method (TIM), Passing Time-based Method (PTM), and Tail interval and Passing time-based Method (T-PM). The optimal layout strategy and the corresponding algorithm of queue length estimation were presented based on filed data. The results indicated that T-PM had a better performance in terms of accuracy and robustness. The layout strategy with a single magnetic sensor was verified to be the most economical strategy to estimate the queue length of the immediate past signal cycle. The experimental results also showed that the proposed single-sensor based method is simple and economical, and will be suitable for large-scale deployment and application.
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