At present, some of our country's roads have simply adopted this control method of Variable Speed Limited Sign. However, due to the small amount of traffic and the limited number of speed limit signs, their functions have not been well played. By controlling the speed, not only can reduce the proportion of road vehicles in a single road segment to improve the speed of uneven, but also according to the adjacent two sections of the speed limit to reduce the speed difference, so as to achieve smooth traffic flow, In case of congestion, reduce head-to-toe collision and improve traffic safety.
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