Method for detecting a wet road and illumination system to implement the method

The method involves capturing an image of a scene of a road lit by a lighting device. Primary luminous spots corresponding to a light beam emitted by a headlight (5) are detected, in the image. Secondary luminous spots of intensity less than the primary spots, corresponding to reflection of the light beam on a wet road are detected in the image. The lighting of the scene is realized by a headlight of a vehicle. An independent claim is also included for a vehicle equipped with a lighting system.