See also:

Configuring the prewarning
After the warning function is switched on, the following can be set via the iDrive: The prewarning can be switched on/off. The time of the prewarning can be set. These settings have no effe ...

End of warning
The warning ends: Automatically after approx. 3 seconds. When returning to your own lane. When braking hard. When using the turn signal. ...

Controls
Almost all functions can be operated in the same manner as they are in the front. Special features of operating the system in the rear are described here. ...