Ramp metering is regarded as one of the best control strategies for freeway traffic system and is widely used.

在高速公路控制方法中，入口匝道控制是应用最广、效果最好的一种控制方法。

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Besides that, in the constructed expressway system, many problems exist such as the ramp control means are alone, the management efficiency is low and so on.

此外在已建成的快速路系统中，还存在入口匝道控制手段单一，管理效率低下等诸多问题。

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Say just one car's stability-control system is activated at an unusually slow speed on a highway off-ramp.

CNN: Behold the?all-seeing, self-parking, safety-enforcing, networked car