如果车辆密度大幅高于上述数字，则车流模式开始出现不稳定现象。
If the traffic density increases much above that, the flow pattern begins to become unstable.
本题的目的，是设计一个能有效地控制进出及使用交通枢纽的车流的模式。
The goal of this problem is to use a model to determine how best to control traffic flow in, around, and out of a circle.
本题的目的，是设计一个能有效地控制进出及使用交通枢纽的车流的模式。
The goal of this problem is to use a model to determine how best to control traffic flow in, around, and out of a circle.
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