Patent ID: 7708434

Claim:
A method for the automatic adaptation of a light beam of a headlight device of a first motor vehicle traveling on a road, the headlight device being able to perform a lighting function of the dipped beam type producing a light beam of the dipped type, and a lighting function of the motorway type producing a light beam of the motorway type, the lighting function of the dipped beam type being activated, wherein it comprises the steps of: detecting the presence of at least a second vehicle, being followed or passed in the opposite direction, not to be dazzled; estimating an instantaneous distance separating the first vehicle from the second vehicle; and determining whether the estimated instantaneous distance is greater than a first threshold value, referred to as the threshold value for activating the motorway lighting function; where necessary, activating the motorway lighting function; wherein the vehicle not to be dazzled is the vehicle closest to the first vehicle.