The Driving Assistant feature combines the camera-based lane deviation warning and approach control and person warning systems with light city braking function and even includes an attentiveness assistant. The lane deviation warning detects lane markings and alerts the driver to unintentional lane changes at speeds above approximately 70 km/h with vibrations in the steering wheel. But if the lane change is deliberate, with the turn indicator having been activated, the warning will not be activated.
The ‘approach control warning’ with light city braking function detects vehicles, while 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 with a warning symbol first being displayed. The symbol then 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, although 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.