在车辆密度较高的情况下，交叉口间距大于某一值后，交通流量保持恒定值。
For a high density, when the distance between the intersections is greater than a certain value, the traffic flow maintains constant.
本文提出了一种利用定点检测器数据（流量和时间平均速度）来获取交通流密度的方法。
This paper has proposed a method to estimate traffic density using the output(traffic flow and time mean speed) of fixed traffic detectors.
以前的研究主要集中于宏观模型，讨论交通流量及密度的变化。
In the past, the hot point is the macroscopic model, which discusses the relationships among the traffic stream variables-speed, flow and density.
根据三种经典的基于密度的交通流参数模型，分别推导了三种占有率速度模型和占有率流量模型。
In accordance with three classical traffic flow parameter models based on density, three kinds of occupancy-speed models and occupancy-flow models are deduced in this paper.
激进驾驶车辆和谨慎驾驶车辆的混合比例及它们的刹车概率对混合交通流的临界密度和流量有很大的影响。
The proportion of aggressive drivers amount and careful drivers amount and their deceleration probability have a strong influence on the critical density and the traffic flow greatly.
车流密度、行车速度和交通流量是反映交通流特征的三个基本参数，三者关系的确定和模型的建立是交通工程理论研究的基础。
The models of traffic density under the conditions of different levels of service are established according to the basic relationship among the velocity, volume and density.
同时，该系统还可以根据车辆运动统计出了一些集总变量的变化情况，例如交通流量、交通流速、交通密度等。
In the simulator, a graphical user interface allows the users to visualize the simulation process, including animation of vehicle motion and some figures reflecting the traffic situation.
同时，该系统还可以根据车辆运动统计出了一些集总变量的变化情况，例如交通流量、交通流速、交通密度等。
In the simulator, a graphical user interface allows the users to visualize the simulation process, including animation of vehicle motion and some figures reflecting the traffic situation.
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