Active Steering Assist assists the driver at speeds up to 210 km/h and helps the driver to stay in the centre of the lane by means of moderate steering interventions. The system orients itself using detected lane markings. Depending on the speed driven, Active Steering Assist uses the vehicles ahead as a reference. If the detection of lane markings and vehicles ahead is impaired, Active Steering Assist switches to passive mode. The system does not provide support in the form of steering interventions.
The driver is required to keep their hands on the steering wheel at all times and be able to intervene at any time to correct the course of the vehicle and keep it in lane.
The status of Active Steering Assist is displayed in the status bar of the multifunction display.
The driver is required to keep their hands on the steering wheel at all times and to be able to intervene at any time. The driver must expect a change from active to passive mode or vice versa at any time.
If the system reaches a system limitation or the driver has not steered the vehicle for a considerable period of time or has removed their hands from the steering wheel, the system will, depending on the situation, first alert the driver with a visual warning. Display 
appears in the multifunction display. If the driver still does not steer the vehicle, or has still not taken hold of the steering wheel, a repeated warning tone sounds in addition to the visual warning message to remind the driver to take control of the vehicle.
The driver steers the vehicle.
The driver presses a steering wheel button or operates Touch Control.
Active Steering Assist is only an aid. The driver is responsible for the distance to the vehicle in front, for vehicle speed, for braking in good time and for staying in lane. Before changing lanes, the driver must make sure that the neighbouring lane is free (glance over the shoulder).
Active Steering Assist has a limited steering torque for lateral guidance. In some cases, the steering intervention is not sufficient to keep the vehicle in the lane or to drive past exits. Active Steering Assist cannot provide the driver with steering assistance at roundabouts, T-junctions, junctions, toll stations or turns, for example.
In snow, rain, fog, heavy spray, if there is glare, direct sunlight, greatly varying light conditions, reflections or strong shadows on the carriageway.
Insufficient road illumination.
The windscreen in the area of the camera is dirty, misted up, damaged or covered.
Absence of lane markings, or several unclear lane markings, or if the markings change rapidly.
The distance to the vehicle in front is too small and the lane markings thus cannot be detected.
The road is narrow and winding.
Obstacles on the lane or projecting out into the lane.
On tight bends, roundabouts and when turning.
When towing a trailer.
When actively changing lane without switching on the turn signal.
If the system limitations of Active Steering Assist are reached there is no guarantee that the system will remain active or will keep the vehicle in lane.
A malfunction in the detection of lane markings and objects can occur.
This could cause unexpected steering intervention.
You can watch an animation on this topic at the following link:
