Abstract

Excessive speed is a significant traffic safety concern on almost all types of roadways. A practical speed management strategy should improve mobility and vehicle progression by reducing nonrecurrent delays and improve public health and traffic safety by reducing the number of speeding-related crashes. Speed feedback signs are an effective speed management strategy. The objective of this article is two-fold: first, quantify the impact of SFS on arterial mobility at the link and intersection levels. Second, to conduct a data-driven safety assessment of arterials with active SFS. A major arterial in Tucson, AZ, with four existing SFS, was selected. Based on the initial results from the collected traffic sensor data, no significant difference was found among all traffic signal performance measures with and without an active SFS. However, statistically significant speed reduction was found at three out of four links after enabling the SFS. In addition, it was found that the impact of SFS on driver’s behavior is a function of their approaching speed. The results of the safety assessment of SFS showed that at an arterial with a link speed of 35 mph, the benefit in dollar value per year associated with a reduction in the severe crash could pay as much as $700,000.

摘要

在几乎所有类型的道路上，超速都是一个重要的交通安全问题。实用的速度管理策略应通过减少非经常性延误来改善机动性和车辆行驶速度，并通过减少与超速相关的碰撞次数来改善公共健康和交通安全。速度反馈标志是一种有效的速度管理策略。本文的目的有两个：首先，量化 SFS 对连接和交叉点级别的动脉流动性的影响。其次，对具有活跃 SFS 的动脉进行数据驱动的安全评估。选择了亚利桑那州图森市的一条主动脉，现有四个 SFS。根据收集到的交通传感器数据的初步结果，在有和没有主动 SFS 的所有交通信号性能指标之间没有发现显着差异。然而，启用 SFS 后，在四分之三的链路上发现了统计上显着的速度降低。此外，还发现 SFS 对驾驶员行为的影响是他们接近速度的函数。SFS 的安全评估结果表明，在链路速度为 35 英里/小时的主干道上，与减少严重碰撞相关的每年美元价值的收益可能高达 700,000 美元。