Collision Warning with Auto Brake helps prevent rear end collisions 

Volvo Cars continues to address the problem of rear-end collisions by introducing Collision Warning with Auto Brake - a refined warning system that makes the car brake by itself if the driver doesn’t act when a rear-end collision with a moving or stationary vehicle is imminent. This film is for demonstrative purposes and intended to provide the viewer with a basic understanding regarding the functionality of the vehicle’s safety systems. Film volvocars.com