Watch A Brake-Checking Moron Cause A Multi-Car Accident

It is unclear exactly what precedes this clip, motivating the Peugeot driver to slow to a stop, however it appears he was angry with the camera car for tailgating. Shortly after both vehicles come to a halt, it looks like the Peugeot driver makes a crude gesture, before both cars are wiped out by fast moving traffic.

Dual-carriageways in the UK have a speed limit of 70mph (edit: as has been pointed out this varies. It appears this video is in a 50mph zone), so the impact would have been pretty severe. The camera car shouldn't have been tailgating, and the Peugeot driver should've simply moved to one side. Nobody comes out of this looking good.