Transportation Research Record: Journal of the Transportation Research Board ( IF 1.7 ) Pub Date : 2020-09-16 , DOI: 10.1177/0361198120941849 Emira Rista 1 , Kay Fitzpatrick 1
To date, the effectiveness of light emitting diode (LED)-embedded pedestrian crossing signs is not understood, despite such signs being installed and used at pedestrian crossings. A recent study by Texas Department of Transportation focused on examining driver yield rates, a surrogate safety measure, for signs installed across the state. A total of 13 sites were sampled and field observations and video footage were recorded at each site for a total of 681 staged crossings. The driver yield rate ranged from 5% to 88%, with an average of 40%, indicating that other factors affect the effectiveness of the signs. Statistical modeling results supported this finding with the main contributors to driver yield rates being vehicle volume, measured at 1 min before the staged pedestrian crossing (converted to an hourly volume for the model), operational speed (85th percentile), deviation from 12-ft lane width, and presence of sidewalk. High hourly volume, speeds 45 mph and greater, lack of sidewalks, and 12-ft lanes (no deviation from baseline 12-ft lane width) were found to affect yield probability adversely. Based on the findings from this study, LED-embedded signs would be a suitable candidate treatment at sites with sidewalks, lower operating speeds and traffic volumes, and narrow lanes. Lastly, a comparison between driver yield rates for rectangular rapid flashing beacons, pedestrian hybrid beacons, and LED-embedded signs for various posted speed limits demonstrated that, of the three treatments, LED-embedded signs have the lowest driver yield rates, especially for higher posted speed limits.
中文翻译:
带有矩形快速闪烁信标和行人混合信标的LED嵌入行人交叉标志的比较
迄今为止,尽管在行人过路处安装并使用了这种发光二极管(LED)行人过路标牌,但人们仍不了解其有效性。得克萨斯州交通运输部最近的一项研究着眼于检查司机的合格率,这是一种替代性的安全措施,适用于全州安装的标志。总共采样了13个站点,每个站点记录了681个分段过境点的现场观察和录像。驱动器的合格率介于5%到88%之间,平均为40%,表明其他因素会影响标牌的有效性。统计模型化结果支持了这一发现,其中主要贡献者是驾驶员收益率是车辆的体积,该体积是在分段人行横道之前1分钟测量的(已转换为模型的小时体积),运行速度(第85个百分位数),偏离12英尺车道宽度和人行道的情况。发现高时速,时速45 mph或更高,没有人行道和12英尺车道(与基线12英尺车道宽度无偏差)会对产量概率产生不利影响。根据这项研究的结果,在人行道,较低的运行速度和交通量以及较窄的车道的地点,LED嵌入式标志将是合适的候选治疗方法。最后,对矩形快速闪烁信标,行人混合信标和针对各种张贴速度限制的LED嵌入式标志的驱动器良率进行比较,结果表明,在三种处理中,LED嵌入式标志具有最低的驱动器良率,尤其是对于更高的发布速度限制。发现高时速,时速45 mph或更高,没有人行道和12英尺车道(与基线12英尺车道宽度无偏差)会对产量概率产生不利影响。根据这项研究的结果,在人行道,较低的运行速度和交通量以及较窄的车道的地点,LED嵌入式标志将是合适的候选治疗方法。最后,对矩形快速闪烁信标,行人混合信标和针对各种张贴速度限制的LED嵌入式标志的驱动器良率进行比较,结果表明,在三种处理中,LED嵌入式标志具有最低的驱动器良率,尤其是对于更高的发布速度限制。发现高时速,时速45 mph或更高,没有人行道和12英尺车道(与基线12英尺车道宽度无偏差)会对产量概率产生不利影响。根据这项研究的结果,在人行道,较低的运行速度和交通量以及较窄的车道位置,LED嵌入式标志将是合适的候选治疗方法。最后,对矩形快速闪烁信标,行人混合信标和针对各种张贴速度限制的LED嵌入式标志的驱动器良率进行比较,结果表明,在三种处理中,LED嵌入式标志具有最低的驱动器良率,尤其是对于更高的发布速度限制。根据这项研究的结果,在人行道,较低的运行速度和交通量以及较窄的车道位置,LED嵌入式标志将是合适的候选治疗方法。最后,对矩形快速闪烁信标,行人混合信标和针对各种张贴速度限制的LED嵌入式标志的驱动器良率进行比较,结果表明,在三种处理中,LED嵌入式标志具有最低的驱动器良率,尤其是对于更高的发布速度限制。根据这项研究的结果,在人行道,较低的运行速度和交通量以及较窄的车道位置,LED嵌入式标志将是合适的候选治疗方法。最后,对矩形快速闪烁信标,行人混合信标和针对各种张贴速度限制的LED嵌入式标志的驱动器良率进行比较,结果表明,在三种处理中,LED嵌入式标志具有最低的驱动器良率,尤其是对于更高的发布速度限制。