Abstract: A computer-implemented method and a device for controlling a lane support system of a vehicle are disclosed. The method includes obtaining data indicative of a driver of the vehicle being in an inattentive state, and determining an intended path of the driver at a point in time when the driver enters the inattentive state. The method further includes determining an unintended lateral deviation from the intended path by computing a function representative of a lateral deviation from the intended path of the driver. Moreover, the function is dependent upon at least one of a change in steering wheel angle, and a change in road geometry along the vehicle’s traveling direction while the driver is in the inattentive state. When the determined unintended lateral deviation violates a threshold value, activating the lane support system to output a warning to the driver and/or to execute an intervention.