The concept
If the vehicle is equipped with Active Cruise Control with Stop & Go, the collision warning is controlled via the cruise control radar sensor.
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:
Buckling the belt
Buckling the belt
Make sure you hear the latch plate engage in the
belt buckle. ...
Diesel Power
Drive a diesel and you'll likely notice the characteristic extra power when
you're pulling away from a stoplight. That comes from low-end torque diesels
typically produce. The X5 xDrive35d has a h ...
Washer fluid reservoir
Adding washer fluid
Only add washer fluid when the engine is
cool, and then close the cover completely to
avoid contact between the washer fluid and hot
engine parts.
Otherwise, there is the d ...
