The Driving Assistant feature combines the camera-based lane deviation warning and approach control and person warning systems with light city braking function and also includes an attentiveness assistant. The lane deviation warning detects lane markings and alerts the driver to an unintentional lane change at speeds above approx. 70 km/h by means of vibrations in the steering wheel. The warning is not activated if the lane change is deliberate, that is, when the turn indicator has been activated. Whereas the approach control warning with light city braking function detects vehicles, the person warning reacts to pedestrians. If a vehicle ahead brakes heavily, the BMW responds immediately when the approach control warning is activated. The system operates in steps. A warning symbol is first displayed, then the symbol begins blinking and an acoustic warning is emitted, and finally the brakes are lightly applied (when travelling at speeds under 60 km/h). The person warning operates at speeds between 10 and 60 km/h and emits a single-level warning in the event of acute danger. If the system warns of a potential collision, the brakes are simultaneously preconditioned for a faster response. In the event of an emergency, the system applies the brakes. This function can be limited by darkness and fog. An attentiveness assistant monitors the driver's steering response for signs of tiredness and displays a message in the control display suggesting the driver take a break in the event of irregular driving behaviour.