Thomas D. Larson Pennsylvania Transportation Institute, The Pennsylvania State University, 201 Transportation Research Building, University Park, PA, 16802, United States.
Lighting Research Center, Rensselaer Polytechnic Institute, 21 Union Street, Troy, NY, 12180, United States.
Accid Anal Prev. 2018 Oct;119:23-28. doi: 10.1016/j.aap.2018.06.008. Epub 2018 Jun 30.
Reducing the potential for crashes involving front line service workers and passing vehicles is important for increasing worker safety in work zones and similar locations. Flashing yellow warning beacons are often used to protect, delineate, and provide visual information to drivers within and approaching work zones. A nighttime field study using simulated workers, with and without reflective vests, present outside trucks was conducted to evaluate the effects of different warning beacon intensities and flash frequencies. Interactions between intensity and flash frequency were also analyzed. This study determined that intensitiesof 25/2.5 cd and 150/15 cd (peak/trough intensity) provided the farthest detection distances of the simulated worker. Mean detection distances in response to a flash frequency of 1 Hz were not statistically different from those in response to 4 Hz flashing. Simulated workers wearing reflective vests were seen the farthest distances away from the trucks for all combinations of intensity and flash frequency.
减少前线服务人员和过往车辆碰撞的可能性对于提高工作区和类似地点工人的安全非常重要。黄色闪烁警示灯常用于保护、划定和向工作区内部和接近工作区的驾驶员提供视觉信息。本夜间现场研究使用模拟工人和带有和不带反光背心的工人在卡车外进行，以评估不同警示灯强度和闪烁频率的效果。还分析了强度和闪烁频率之间的相互作用。本研究确定，强度为 25/2.5cd 和 150/15cd（峰值/谷值强度）为模拟工人提供了最远的检测距离。对 1Hz 闪烁频率的响应的平均检测距离与对 4Hz 闪烁频率的响应的平均检测距离没有统计学差异。对于强度和闪烁频率的所有组合，穿着反光背心的模拟工人在远离卡车的距离上最远。
