交叉口绿灯倒计时信号对黄灯时长的影响研究

在分析绿灯倒计时信号对驾驶员驾驶行为的影响以及最佳黄灯时间计算方法的基础上,建立车辆在绿灯末期运动过程的数学模型,确定考虑绿灯倒计时信号的最佳黄灯时间计算方法。计算分析结果表明：车辆加速性能对最佳黄灯时间的影响可以忽略；考虑绿灯倒计时信号的情况下,信号灯的可见距离越长,所需的黄灯时间越长；在信号灯可见距离足够远的情况下,最佳黄灯时长比未考虑绿灯倒计时信号多0.6～0.7 s。建议对于信号灯可见距离较远、流量未饱和,且未安装交通违法检测装置的交叉口,黄灯时间延长一个闪烁周期,并去除黄灯倒计时信号。

Research on Effect of Green Signal Countdown on Amber Signal Duration at Intersection

Based on the review of the effect of green signal countdown on driving behavior and the method of the optimal amber signal design,the mathematical model of the car motion during the countdown of green signal is established,and then the method for the optimal amber signal design considering the green signal countdown is proposed. The computation indicates that the length of amber signal is uncorrelated with vehicle acceleration,and in the consideration of green signal countdown,the intersection with long vision distance of signal needs long amber time; when the vision distance of amber signal is long enough,the optimal amber time should be0. 6 ～ 0. 7 s more. It is suggested that one more period of the amber signal should be added for the intersection with unsaturated flow,no monitoring equipments,and long vision distance of signal and the countdown of amber signal is suggested to be removed.