Last winter I got to watch a SUV roll and then twirl on its nose like a top after doing a pin-ball bounce maneuver between jersey barrier and plow ridge, all the while shedding various parts, window glass and a huge cloud of rust & dust, ejecting every item loose in it's interior. I was first to stop and was expecting the worst as I ran to the vehicle when the driver popped out looking like he'd merely had sex on the bus on the way to work (a common appearance snipe here in Minnesota) so remember it's not only wearing seat belts but having them snugged tight enough you won't slip out of them...