Method for controlling the lighting strength of a light beam emitted by a vehicle lighting assembly

The method involves emitting a light beam (1a) by a vehicle (3a), where other vehicles (3b,3c) are arranged in the emitting area of the light beam. The latter vehicles emit other light beams (1b,1c). The former light beam of the data set is modulated by the former vehicle. The modulation signal is received and demodulated by the latter vehicles.