The anti fog lamp is composed of laser diodes located at the rear of the vehicle. In high visibility conditions, the fan-shaped light will emit a clear signal to the rear vehicle, and the red line formed by the beam of light after touching the road surface will warn the rear vehicle. The light seen by the driver of the rear vehicle at a certain distance looks like a "stop line". In low visibility conditions such as rainy and foggy days, the laser beam emitted by the rear fog lights can penetrate raindrops, and the light seen by the driver behind is like a red triangle, used to warn to maintain a safe distance. This type of laser rear fog light may become a new trend in active safety defense in the near future.

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