If the speed difference is 4-15 km/h (3-9 mph) in relation to the vehicle in front then City Safety can completely avoid a collision.
City Safety activates a short, sharp braking procedure and stops the car in normal circumstances, just behind the vehicle in front. For most drivers this is well outside normal driving style and may be experienced as being uncomfortable.
If the difference in speed between the vehicles is greater than 15 km/h (9 mph) then City Safety may not avoid the collision on its own - to obtain full brake force, the driver must depress the brake pedal and this could then make it possible to avoid a collision, even at speed differences above 15 km/h (9 mph).
When the function is activated and brakes, the combined instrument panel shows a text message to the effect that the function is/has been active.
When City Safety brakes, the brake lights come on.