The Driving Assistant feature combines the camera-based Lane Departure Warning and Approach and Pedestrian Warning systems with City Brake Activation.
The Lane Departure 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 Warning with City Brake Activation detects vehicles, the Pedestrian Warning with City Brake Activation reacts to pedestrians. When there is a risk of collision, the Approach Warning triggers a two-stage warning – a symbol in the instrument cluster lights up, followed by an acoustic alarm. The Pedestrian 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.
The Driving Assistant Plus feature (only available with Steptronic transmission) includes not only Approach Warning and Lane Departure Warning, but also Active Cruise Control with Stop&Go function. This provides assistance when driving on motorways in both critical and stable traffic situations. This option is only available in conjunction with the Navigation System Business or Professional.
The Approach Warning responds in stages. Depending on whether a vehicle ahead brakes suddenly or a stationary object is detected, the reaction ranges from a visual signal to active braking and even a complete standstill. Should the car begin to change lanes unintentionally, the Lane Departure Warning quickly provides a warning by means of vibrations in the steering wheel.
The Active Cruise Control maintains a constant selected speed between 30 km/h and 210 km/h or automatically adjusts to conform with the cars driving in front if the distance control is activated. The Stop&Go function even controls speed down to a standstill, accelerating again easily when the gas pedal is pressed, for example in dense moving traffic.