The active lane assist system assists the driver in keeping the vehicle in the right lane.
The system uses a camera in the windscreen to detect the markings of the lane you are driving in. If the vehicle approaches one of the detected lane markings, the system corrects the steering to warn the driver that the vehicle is about to cross one of the markings. You can override this steering correction at any time. In addition, the steering wheel vibrates to warn you if you cross a lane marking. The vibration warning must be activated in the MMI. The active lane assist system is functional when it has detected a lane marking on at least one side of the lane you are driving in. The green lamp 
in the instrument cluster indicates that the function is activated and fully functional.
in the instrument cluster indicates that the function is activated and fully functional.
If you operate the turn signal before crossing one of the lane markings (while the lane assist system is functional), the system will detect that the lane change is intended and will not warn the driver.
As the system is designed for driving on motorways and other major roads, it is only active above a speed of about 65 km/h (may vary in different export markets).
If the vehicle is also equipped with the Audi adaptive cruise control* or Audi parking system*, the system may intervene differently in the steering depending on the situation. In addition to lane markings, the system can detect other objects such as crash barriers, etc. If the system detects that these are too close, the Audi active lane assist function will help you to maintain a safe distance. The system even allows for overtaking by not intervening in the steering if it detects an overtaking manoeuvre.
WARNING!
- The system initiates a corrective steering input to warn the driver that the vehicle is about to leave the lane. As the driver you are always responsible for staying in your own lane.
- The system can assist you to keep the vehicle in the lane, however it is not capable of steering on its own. Never take your hands off the steering wheel.
- In certain situations, e.g. during heavy braking, the system may not correct the steering.
- Not all of the lane markings are detected by the camera. A corrective steering input can only be initiated if the system detects a lane marking on the side in question. Variations in the road surface or objects on the road may be misinterpreted as lane markings. In this case, the steering may be corrected unexpectedly or not at all.
- The camera's view may occasionally be obstructed, for example by vehicles travelling in front, rain, snow, heavy road spray or adverse light. If this happens, the active lane assist may not detect the lane markings or may respond incorrectly.
- In certain situations, e.g. if only one lane marking is detected, the setting for the steering correction may be switched from "early" to "late".
- In certain driving conditions, such as ruts in the road surface, adverse cambers or side winds, the assistance provided by the steering correction may be insufficient to keep the vehicle in the middle of the lane.