With the increase in the numbers of vehicles, the density of traffic flow is also increased which results that vehicles move with non-uniform velocity on road such as accelerating and braking.
随着汽车的保有量迅速增加，车流密度也在不断提高，汽车在运行时经常处于加速超车、减速制动等变速运行工况。
参考来源 - 车辆非平稳行驶动力学及控制研究·2,447,543篇论文数据，部分数据来源于NoteExpress
Darker traces signifiy slower speeds, and colour coding shows the density of traffic in different areas.
较深色的线条表示航行速度较慢，条码的颜色代表不同区域的交通密度。
First is free flow in which the density of traffic is low enough to allow vehicles to travel at the maximum speed allowed.
首先是畅通无阻，交通密度足够低，使得车辆能以最高时速行驶。
Initially set velocity, density of traffic flow, traffic volume of service and the rate of traffic load as the measurement indicators.
对航道服务水平进行定义，并初步确定速度、交通流密度、服务交通量和交通量负荷比等四项度量指标。
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