The concept
The system issues a two-phase warning of a danger of collision at speeds above approx.
10 mph/15 km/h. The time of these warnings may vary depending on the current driving situation.
The collision warning is available even if cruise control has been deactivated.

It responds to stationary or moving objects that are within the detection range of the radar system.
When the vehicle is intentionally brought into contact with a vehicle, the collision warning is delayed to avoid false warnings.
See also:
Hazard warning flashers
The button is located in the center console. ...
Issued warning
If you leave the lane and if a lane marking has
been detected, the steering wheel begins vibrating.
If the turn signal is set before changing the lane,
a warning is not issued.
End of warning
T ...
Safety
The BMW 1 Series hasn't been crash-tested. It includes frontal, front-seat
side-impact and side curtain airbags. Also standard are antilock brakes and an
electronic stability system with traction ...
