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首页> 外文期刊>Transportation Research Part B: Methodological >Optimal advance detector location for green termination systems on high-speed isolated rural intersections
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Optimal advance detector location for green termination systems on high-speed isolated rural intersections

机译：高速隔离农村交叉路口的绿色终端系统的最佳提前​​检测器位置

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This study seeks to identify the optimal location of an advance point traffic detector (APTD) to support green termination algorithms for enhanced dilemma zone protection systems at high-speed isolated signalized rural intersections. This is done by developing a nonlinear optimization model with the objective to maximize the opportunities to predict empty dilemma zones during a look-ahead time period subject to the prediction accuracy which is manifested through prediction efficiency and safety constraints in the model. The distance of the APTD from the stop bar of the intersection represents the decision variable. The Golden-Section line search algorithm combined with numerical integration techniques is proposed to identify the feasible region and the optimal solution. The proposed methodology is analyzed using field data from a high-speed isolated intersection in Lincoln, Nebraska. The numerical experiments demonstrate that as the constraints associated with prediction efficiency and safety are relaxed, the feasible range to deploy the APTD increases. The optimal solution is influenced by the relationship between the prediction error and the location of the APTD, illustrating the need to robustly calibrate the function used to estimate the variance of the prediction error using field data. From a practice standpoint, the study confirms the potential concerns related to the performance efficiency of green termination systems using a point detector; typical field implementations locate the detector 750-1000 ft from the stop bar, which can potentially lead to significant levels of missed opportunities to terminate green safely. Overall, the proposed approach not only provides a systematic analytical methodology to determine the optimal location of the advance detector, but also to identify its feasible range based on user-specified thresholds related to efficiency and safety.
机译：这项研究试图确定提前点交通检测器（APTD）的最佳位置，以支持绿色终止算法，以在高速隔离的信号化农村交叉路口处增强困境区域保护系统。这是通过开发一个非线性优化模型来完成的，其目标是在预测准确度的前提下，在预见时间段内最大化预测空白困境区域的机会，这取决于模型中的预测效率和安全性约束。 APTD距路口停止点的距离代表决策变量。提出了一种黄金分割线搜索算法，结合数值积分技术，确定了可行区域和最优解。使用来自内布拉斯加州林肯市的高速隔离路口的现场数据对提出的方法进行了分析。数值实验表明，随着与预测效率和安全性相关的约束的放宽，部署APTD的可行范围增加。最佳解决方案受预测误差与APTD位置之间关系的影响，这说明需要使用现场数据来稳健地校准用于估计预测误差方差的函数。从实践的角度来看，该研究证实了与使用点检测器的绿色终端系统的性能效率有关的潜在问题；典型的现场实施方式是将检测器放置在距离停止杆750-1000英尺处，这有可能导致大量错失机会，无法安全地终止绿色。总体而言，所提出的方法不仅提供了一种系统的分析方法来确定超前探测器的最佳位置，而且还会根据用户指定的与效率和安全性相关的阈值来确定其可行范围。

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