Traffic control of expressways is to regulate, warn and induce traffic in order to improve the transport safety and efficiency of people and goods. To achieve this control process, not only related to the detector, Variable Speed Limited Sign, computers and other monitoring equipment, but also relates to the driver on the road conditions, traffic conditions and traffic signals, variable signs of reaction.

An important way to achieve these goals on the highway is to control variable speed. That is, on the main line of the highway, a variable speed limit mark is set at intervals, and the speed limit value of the Variable Speed Limited Sign is controlled by the computer.

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