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据上海延安高架路段的交通流录像资料提取的28000余组实测数据,作出流量-密度图,发现在整体低密度时段,流量-密度图可以用Kerner指出的自由流阶段的曲线表示;随着路段整体平均密度的递增,自由流特性越来越不明显。在整体平均密度较低的情况下,存在一定数量的高速度高密度数据。利用观测得到的大量数据,在按密度划分的不同区间内对已有的多个速密关系函数进行最优筛选,得到一种新的分段平衡函数的表达式。最后提出了基于实测数据计算MCLWR模型中各层次车辆所占比例和速度系数的方法。
According to the measured data of more than 28000 sets of traffic flow data collected from the traffic flow footage of the elevated section of Yan’an, Shanghai, a flow-density graph was made. It was found that in the whole low-density period, the flow-density graph can be expressed as a curve of the free- As the overall average density increases, the free-flow characteristics become more and more insignificant. In the case of lower overall average density, there is a certain amount of high-speed, high-density data. Based on the large amount of data obtained from the observation, the existing multiple close relational functions are optimally screened in different intervals divided by density to obtain a new expression of the piecewise balanced function. Finally, a method to calculate the proportion and speed coefficient of vehicle in all levels in MCLWR model based on the measured data is proposed.