干线和以上标准的道路上不适合进行交通稳静化，因为它们要求较高的计算行车速度。
On roads of arterial standard and above, traffic calming is never appropriate because they require higher Design Speeds.
子块以PIC16C54为核心，通过测定齿槽板的挡光脉冲来计算行车速度及方向；
The submodule adopts a PIC16C54 as core processor and calculates the moving speed and direction by detecting the shading pulses of the toothandslots board.
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