Introduction:Fog is one of the main causes of traffic accidents. The visibility range in rainy and foggy days is so weak to cause traffic accidents. The latest developed laser fog light works through the installation of a laser transmitter on the back of the vehicle to project red distance warning line to the ground in rainy and foggy weather. Compared with the traditional fog lights, it's easier to be found because of the laser high penetrating power. Besides, it can remind vehicles behind to maintain some safe distance. The laser beam emits downward with a certain inclination angle to avoid no direct exposure to the eyes. Open the light in the sunny weather, one can only see a laser line projected on the ground, no need to worry about it covering the vehicle license plate.