Method for determining the drowsiness or attention level of the driver of a road vehicle, and road vehicle thereof

Method for determining the drowsiness/attention level of the driver of a road vehicle; the method comprises the steps of: detecting at least one steering parameter related to the kinematics of a driver-operated device for steering; where the steering parameter is related to the steering angle and/or the steering speed of the road vehicle; elaborating a steering index as a function of the at least one steering parameter detected; detecting at least one line parameter related to the position of the road vehicle within a lane; processing a line index as a function of the at least one line parameter detected; computing a driver drowsiness/attention index as a function of a combination of the steering index and the line index.