2013 Audi Q7 Owner's Manual 

Side assist compares the distance and difference in speed of detected vehicles with the speed of your vehicle. Whenever the difference in speed and distance is registered as notable if you were to change lanes, a signal light appears on the respective mirror. The signal can light up if you are passed by a vehicle or if you are passing another vehicle. If you pass another vehicle slowly (difference in speed less than 9 mph, or 15 km/h), the signal light will come on as soon as the other vehicle is in your blind spot and is detected by side assist.

When the difference in speed is greater, the signal light will not come on. Side assist helps you by using the appropriate signal stage, depending on whether or not you have activated the turn signal, and thus have indicated that you are or are not changing lanes. As long as you have not activated the turn signal, side assist informs you of detected vehicles that are registered as being in a notable location if you were to change lanes. Whenever the detected vehicle's difference in speed and distance is registered by side assist as notable, the signal light on the respective mirror produces muted illumination.

The brightness of the informational stage signal is designed not to be as intense so that it does not interfere with your view of the road when you are driving and have no intention of changing lanes. When you look in the outside mirror, you can clearly see the informational stage signal.

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