This can, for example, be if:
- the vehicle approaching from behind is detected too late
- the vehicle approaching from behind changes lane at the last moment
- a trailer, bicycle rack or similar is connected to the car's electrical system - the function is then deactivated automatically.
In certain markets, RCW does not give a warning with the direction indicators due to local traffic regulations - in such cases, this part of the function is deactivated.
This function uses the car's radar units, which have certain general limitations.