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利用广佛高速公路的数据，首先比较了以15min、5min和1min为统计间隔统计的各流率区间内的速度、密度均值，以及最高频率出现的速度、密度值，然后比较了以15min、5min和1min为统计间隔的统计结果标定的Greenshields模型和Underwood模型，认为：标定交通流模型时，可采用的最小统计间隔为5min;当模型精度要求为10％时，最小统计间隔为1min．
Using the data of Guangfo Expressway, the velocity, density average and velocity and density of each flow rate interval in 15min, 5min and 1min intervals were compared. And 1min as the statistical results of the statistical interval Greenshields model and Underwood model, that: calibration traffic flow model can be used when the minimum statistical interval of 5min; when the model accuracy requirements of 10%, the minimum statistical interval of 1min.