The Drive Assist package spots danger before it’s too late. Lane Departure Warning, for example, detects lane markings and alerts the driver to an unintentional lane change (ie when the indicator has not been activated) at speeds above approx. 43mph.
Additionally, if a vehicle ahead brakes suddenly, the BMW 3 Series Approach Control Warning is immediately activated – flashing a symbol at first, before emitting a warning sound and finally lightly applying the brakes (when travelling at speeds under 37mph).
The Person Warning operates in a similar way, warning of a potential collision with a pedestrian at speeds between 6 and 37 mph by emitting a warning and pre-conditioning the brakes for a faster response. In the event of an emergency, the system actually applies the brakes. (This function can be limited by darkness and fog).