倒计时信号灯绿灯间隔时间设置研究

就保障倒计时信号交叉口交通安全而言,适当设置倒计时信号灯绿灯间隔时间具有重要意义。选择南京一个道路交叉口,利用交通冲突理论,分析产生严重交通冲突的条件,考虑车流不饱和与饱和2种情况,得到在不发生严重交通冲突条件下的绿灯间隔时间,并通过实例说明。研究结果显示,在车流饱和状态下,头车与尾车均为大车时,头车以初速度零开始加速进入交叉口时绿灯间隔时间应最短;在不饱和状态下,头车与尾车均为大车时,头车以一定速度通过交叉口时绿灯间隔时间应最长;车流饱和时绿灯间隔时间应较短,车流不饱和时绿灯设置间隔时间应较长。

Research on Green Interval Setting for Counting Down Traffic Signal

It was held by the authors that in order to guarantee traffic safety of intersection,the methods for setting the green interval of counting down traffic signal.An urban road intersection in Nanjing was chosen,the theory of traffic conflict was used,scenarios under which serious traffic conflicts occur were considered,the saturation and unsaturation situation of traffic flow were dicussed.Green interval for preventing serious traffic conflict was set.The research results show that for saturation flow,green interval should be shortest under the condition that head vehicle and tail vehicle are large ones,and the head venhicle will start and go through the crossing at the original speed,that for unsaturation flow green interval should be longest under the condition that head vehicle and tail vehicle are large vehicles and head vehicle through the crossing at a high speed,and that the green interval should be longer in unsaturation flow than in saturation flow.