寒冷地区城市道路信号控制参数取值研究

在冰雪路面环境下,调查数据表明车辆的运行特征发生了显著变化,主要表现在车速、加速度下降了30%,饱和流率下降了16%,起动、制动损失时间上升了27%。基于HCM、Webster信号控制理论与不同路面环境下的车流运行特征值,对信号控制中周期时长、绿信比、相位差以及黄灯时间、红灯时间的合理取值问题进行了分析,得到了冰雪路面环境下信号控制参数取值的影响因素与变化范围。仿真研究表明:在冰雪路面环境下采用非冰雪路面环境下的信号控制方案会增加车辆延误与排队长度,加剧交叉口的拥挤程度。因此,交通信号控制系统应针对不同的路面环境分别制定与路面环境相适应的信号控制方案。

Study on Valuation of Signal Control Parameters of Urban Road in Cold Region

In icy road environment,the survey data indicates that notable decrease of vehicle running features occurs when icy begins to accumulate on the road surface.Saturation flow decreases by 16%,speed and acceleration decreases by 30%,and start-up lost time increases by 27%.Based on the signal control theory of HCM and Webster and the character values of traffic flow under different road environment,the reasonable valuation of cycle length,green ratio,offset,yellow time and red time were analysed,the impact factors and the changes in scope of signal control parameters under icy road environment were accessed.Simulation results show that the normal signal control plan can increase delay,queue length and traffic congestion under icy road environment.Therefore,the traffic signal control system should address the suitable signal control plan based on different road environments.