Civil & Environmental Engineering, Center for Transportation Policy Studies, The University of North Carolina at Charlotte, Charlotte, North Carolina 28223-0001, USA.
Traffic Inj Prev. 2010 Dec;11(6):632-41. doi: 10.1080/15389588.2010.498845.
The time left to cross the street displayed on pedestrian countdown signals can be used by pedestrians as well as drivers of vehicles, though these signals are primarily provided to help pedestrians make better crossing decisions at signalized intersections. This article presents an evaluation of the effect of pedestrian countdown signals in reducing vehicle-pedestrian crashes and all crashes at signalized intersections.
A before-and-after study approach was adopted to evaluate the effect considering pedestrian countdown signals installed over a 5-month period at 106 signalized intersections in the city of Charlotte, North Carolina.
Analysis conducted at 95 percent confidence level showed that there has been a statistically insignificant decrease in vehicle-pedestrian crashes but a statistically significant decrease in all (includes vehicle-pedestrian and vehicle(s) only involved) crashes after the installation of pedestrian countdown signals. No negative consequences were observed after the installation of pedestrian countdown signals. Sixty-eight percent of the signalized intersections saw a decrease in the total number of all crashes, and 4 percent of the signalized intersections have not seen any change in the number of all crashes after the installation of pedestrian countdown signals. Improvements in terms of decrease in the total number of all crashes was high at signalized intersections with greater than 10 crashes per year during the before period. Likewise, decrease in the number of all crashes was high at signalized intersections with traffic volume between 7 AM to 7 PM greater than 20,000 vehicles during the before period.
Based on results obtained, it can be concluded that pedestrians as well as drivers are making better decisions using the time left to cross the street displayed on pedestrian countdown signals at signalized intersections in the city of Charlotte, North Carolina.
行人倒计时信号上显示的过马路剩余时间可供行人和车辆驾驶员使用，尽管这些信号主要是为了帮助行人在信号交叉口做出更好的穿越决策而提供的。本文评估了行人倒计时信号在减少车辆-行人碰撞和信号交叉口所有碰撞方面的效果。
采用前后研究方法，评估了在北卡罗来纳州夏洛特市的 106 个信号交叉口安装行人倒计时信号的 5 个月期间的效果。
在 95%置信水平下进行的分析表明，安装行人倒计时信号后，车辆-行人碰撞的数量虽没有统计学意义上的减少，但所有（包括车辆-行人碰撞和仅涉及车辆的碰撞）碰撞的数量有统计学意义上的减少。安装行人倒计时信号后没有观察到任何负面后果。在安装行人倒计时信号后，68%的信号交叉口总碰撞数量有所减少，而 4%的信号交叉口总碰撞数量没有变化。在前期每年发生超过 10 起事故的信号交叉口，减少所有碰撞的总数方面取得了较高的改善。同样，在前期 7 点至 7 点交通量大于 20,000 辆的信号交叉口，减少所有碰撞的数量也较高。
根据获得的结果，可以得出结论，在北卡罗来纳州夏洛特市的信号交叉口，行人以及驾驶员正在利用行人倒计时信号上显示的过马路剩余时间做出更好的决策。
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