Audi A4 Owners Manual

System limitations
Controls / Adaptive cruise control (ACC) / System limitations

General notes

The following situations could impair the function of the radar sensor.

The adaptive cruise control is subject to given physical limits and also has certain limits determined by the system itself. Under certain circumstances the driver may feel that the ACC system is responding unexpectedly or belatedly. For this reason, please always give your full attention to road traffic and if necessary take action yourself:

  • Х When driving through bends.
  • Х When vehicles in front are not in line with your vehicle.
  • Х When other vehicles change lanes.
  • Х When other vehicles are not clearly discernible
  • Х When vehicles are stationary.

Audi A4: System limitations. The radar sensor's "field of vision" can be impaired by rain, snow or a WARNING

The radar sensor's "field of vision" can be impaired by rain, snow or a lot of water on the road. This results in vehicles in front not being properly recognised or, in some circumstances, not being detected at all. If necessary, take action yourself!

When driving through bends

Audi A4: System limitations. Driving into a bend

Driving into a bend

Audi A4: System limitations. Driving out of a bend

Driving out of a bend

Driving into a bend

When you are driving into a bend, the ACC system may react to a vehicle travelling in the other lane and therefore brake the vehicle, fig. 149. You can override the braking effect by pressing the accelerator.

Driving out of a bend

When you are driving out of a long bend, the ACC system may - in the course of its calculation of the lane ahead - react to a vehicle travelling in the other lane and therefore brake the vehicle, fig. 150. You can override the braking effect by pressing the accelerator.

Vehicles in front travelling out of line

Audi A4: System limitations. The vehicle in front is outside the range of the radar sensor

The vehicle in front is outside the range of the radar sensor

Vehicles in front which are not in line with your vehicle cannot be detected by the ACC system until they are within the range of the sensor.

Other vehicles changing lanes

Audi A4: System limitations. A vehicle is changing lanes

A vehicle is changing lanes

Vehicles which are very close to you when they move onto your lane cannot be detected by the radar sensor until they move into its range.

Not clearly discernible vehicles

Audi A4: System limitations. Motorcycle in front

Motorcycle in front

Vehicles that are not clearly discernible, e.g. a motorcycle travelling in front of you and vehicles with a large amount of ground clearance or protruding freight, are often identified late or may not be detected at all.

Stationary vehicles

Audi A4: System limitations. Vehicle turning off and vehicle stationary

Vehicle turning off and vehicle stationary

Audi A4: System limitations. Vehicle changing lane and vehicle stationary

Vehicle changing lane and vehicle stationary

If a vehicle detected by the ACC system turns off or changes lane and another stationary vehicle is located in front of that vehicle, the ACC system will not react to the stationary vehicle ⇒ fig. 154 and ⇒ fig. 155.


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