They are hated by motorists the world over, no not caravans but speed bumps which as you may well know are designed to slow traffic.
Looks like one driver was caught unawares at the last moment. From what we can tell the driver is speeding when upon a sudden he notices the speed bump.
At the last moment he brakes and manages to perform a handbrake turn but slides sideways into the speed bump which causes the car to roll over.
The lesson is don’t drive like an idiot.