为解决大型车对路侧交通标志的遮挡问题,针对普通公路大型车比例较高的特征,分析了我国常见的双向4车道普通公路外侧车道行驶的大型车遮挡内侧车道行驶的小型车驾驶员视认路侧交通标志的过程,推导了视认过程中的遮挡长度和遮挡概率的计算公式,设计了确定路侧交通标志重复设置次数的计算流程,建立了路侧交通标志重复设置间距的计算模型,并用算例进行了验证.结果表明:重复设置一次后,两块限速标志都被大型车遮挡的概率为0.023;路侧交通标志重复设置的最佳间距为155 m.
In order to reflect the influence of the drivers＇ characteristic differences on intersection capacity under a mixed traffic flow, a driver correction coefficient for the intersection capacity calculation according to the driver＇s visual characteristics is proposed. First, the parameters of the driver＇s visual characteristics at some real roads, including gaze fixation distribution, mean fixation duration, visual angle distribution and some other parameters at intersections, are collected. Then, the relationship between the traffic flow rate at intersections and the parameters of driver eye movements are established. The analytical results indicate that when the traffic flow is unsaturated, the parameters of driver eye movements change relatively little; however, when the traffic flow is saturated, the parameters of driver eye movements change drastically. Finally, the saturation-flow-rate model is modified according to the parameters of driver eye movements; thus, a capacity model of intersections considering the driver＇s visual characteristics is obtained.
