How does an anti-ram barrier work?

The creators of the anti-ram device demonstrated what would remain of a KamAZ truck if a car crashed into it.

The barrier is designed to control and restrict access to specially protected facilities, as well as to counter the terrorist threat. They can be used to organize checkpoints or create inspection areas on highways. Judging by the video, the device is capable of destroying a car of almost any size, taking into account what is left of a loaded KamAZ truck after a collision with it.