After the ignition is switched off
The roof can still be operated for approx. 1 minute, as long as no door has been opened.
See also:
Lane Change Warning System monitors vehicles following behind
Inattentiveness or misjudgement of the distance and speed of a vehicle
approaching from behind can lead the driver into a critical situation when
changing lanes. The optional Lane Change Warning S ...
Tire inflation pressure values up to 100 mph/160 km/h
320i
328i
335i
...
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.
...