Method for distinguishing auxiliary road signs from main road signs

The invention relates to a method for distinguishing secondary road signs from primary road signs, comprising:-acquiring, by means of a primary camera, a primary image of the environment in front of or behind a vehicle, said primary image comprising images of the primary road signs located in front of or behind and of the secondary road signs; -acquiring an auxiliary image of the environment of one side of the vehicle by means of an auxiliary camera, said auxiliary image comprising an image of a main road sign and of an auxiliary road sign located on said side; determining a primary color of the primary road sign and a secondary color of the secondary road sign from the primary image by means of the primary camera; -transmitting, by means of the main camera, a main position vector of a main sign with its main color and an auxiliary position vector of an auxiliary sign with its auxiliary color, as inferred from the main image, to the control unit; transmitting, by means of the auxiliary camera, a primary posit