The nonsymmetry of car density on two lanes has important influence on the traffic flow.

两车道上车辆密度的不对称性对交通流有重要的影响。

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It is proved that the fundamental diagram of the average traffic flow speed as the function of the car density for the new model is exactly the same as for fi model.

证明新模型的基本图，即车流渐近稳态的平均速度与道路上的车辆密度之间的函数关系与FI模型的完全相同。

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Zipcar has had challenges in the us - a low utilisation rate caused by low population density and vehicle dislocation [sending someone to retrieve the car is a problem].

在美国，在线汽车租赁遇到了很大的挑战，低人口密度和低机动车复位率(没有人将那些使用过的汽车归回原位)导致网站利用率很低。

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In July and August, the population density and traffic becomes so thick with vacationing Romans that one can push their car across the capital, Portoferraio, at about the same pace as driving it.

BBC: Following Napoleon��s trail on Elba

Each car starts with a certain position and speed, and the road thus has a particular density of cars that changes as they move along, and as new cars are injected from a junction slip-road.

ECONOMIST: Traffic management: Desynchronised | The