The invention relates to a method for controlling an automated driver-assistance system of a motor vehicle, which proposes a first automated driving mode disengaging at the end of a first transition phase and a second automated driving mode disengaging at the end of a second shorter transition phase, comprising the following sequence of steps: detecting, when the first mode is activated, a degradation of the driving context which does not allow same to continue beyond said first transition phase (100); assessing the level of attention to driving of the driver (200); checking the compatibility of the driving context with the implementation of said second mode and that said level of attention is no lower than a predefined minimum threshold (300); and directly activating said second mode (600) if said checking step is validated and if said driver performs a given action within a predetermined time period.