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在分析多车道公路信号平交口间路段交通流运行特征的基础上,提出了基于交通流稳定距离的平交口安全间距分析方法。利用交通冲突率在路段上的分布趋势,验证了以CV(车速标准差变异系数)值作为间接安全评价指标的有效性;在仿真环境下,分析了交通量、信号周期、转向交通量比例、货车比例对CV值分布的影响;对典型环境下CV值的分布进行了曲线拟合,从而确定了各接入类别多车道公路的交通流稳定距离;结合平交口上游功能区的长度,给出了信号平交口最小安全间距的推荐值。结果表明:从交通流角度分析平交口间距是可行的,多车道公路信号平交口最小安全间距可表示为交通流稳定距离与平交口上游功能区长度之和。
On the basis of analyzing the characteristics of traffic flow in the cross-section of multi-lane highway signal, a safety clearance analysis method based on the stable distance of traffic flow is proposed. The validity of the indirect safety evaluation index based on CV (speed standard deviation coefficient of variation) was verified by using the distribution trend of traffic conflict rate in the road sections. In the simulation environment, the traffic volume, signal period, steering traffic ratio, The ratio of truck to the distribution of CV value; the distribution of CV values in a typical environment curve fitting to determine the access road traffic flow stability of multi-lane highway; The signal level junction minimum safe distance recommended The results show that it is feasible to analyze the intersection of horizontal crossings from the perspective of traffic flow. The minimum safety clearance of cross-lane intersections of multi-lane highway signals can be expressed as the sum of the stable distance of traffic flow and the length of upstream functional area at the level crossing.