The attentive companion Fatigue Detection currently observes the driver starting at a speed of 65 km/h and focuses its sensor on the times when he steers (steering moment), the way that he steers (steering angle) and how fast he steers. If the driver doesn’t move the steering wheel for a longer period of time or only moves it a little, a threshold is exceeded and the system emits a warning.
And the helper persists. A driver who ignores the message will be prompted a second time 15 minutes later. It is high time to take a break and drink a cup of fresh coffee or stretch the legs. There are additional tips in the on-board computer manual.