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通过拍摄中国几个典型大城市不同快速路段的交通流录像并进行“车速-车头间距”数据采集,建立了一个包含210920组交通流实测数据的大样本数据库,根据实测数据得到的平均车速随着车头间距的增大而增大,符合交通流的基本特征;从超车道到交换道,一般平均速度依次下降,但在出口匝道影响下会出现“密度倒置”现象,实测数据转换得到“流量-密度”基本图,存在整个密度变化范围里都呈现非线性特征的类型,在小间距数据中,发现存在超过7%的“高速跟驰”车辆.
A large sample database containing 210920 sets of measured data of traffic flow was set up by shooting the traffic video of different fast sections of several typical metropolitan areas of China and carrying out the data collection of “speed-head spacing”. According to the measured data, the average speed With the increase of the distance between the front and the rear, it accords with the basic characteristics of traffic flow. From overtaking lane to interchange lane, the average speed decreases in turn, but “density inversion” appears under the influence of exit ramp. The measured data conversion We get the “Flow-Density” basic graph, which shows the type of non-linear feature in the whole density range. In the small-span data, more than 7% of the “High Speed Car” vehicles are found.