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When our car breakdown at night when we driving on the high-way,we need to put the warning board in person 150 meters away from our car.
During this walking, both man and car are very dangerous.This design applies to the latest projector technology,when the car breakdown unfortunately,all we need to do is to start the emergency button,so that the infrared ray will be projected and fixed 150 meters away from the car to keep man and car safe.When the following car get closer, the red warning line will remind him.