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The “warning rod” is equipment that can measure height and display warning information by wireless projecting technology. The rod is replaced by laser line to measure the height, so as to promise the safety of the truck. It is composed by two poles on each side of the road. When a truck is passing, its height is detected by the laser ball in coordinate height. And then, the relative information is displayed in front of the truck. The driver can confirm whether the truck is ultrahigh and select the reasonable route according to the information, avoiding the potential accident in advance.