How do you flip a car on a straight road??

[Jondot]

Fell off the back of a car carrier, car carrier keeps going and the car is left on the highway with no external signs of arrival.

Were there skidmarks leading up to it?

Interesting theory, but cars are usually pretty well secured on those things. And, even if something did snap and it fell off, I can't see it rolling. If it fell off from a low height (the lower level), surely it'd just land on its tyres. If it fell off the top, it could roll over on the way down to the ground, but I think there would be pretty obvious damage to its roof. Might even collapse in, I don't know, but I would have thought that a drop from that height would result in significant damage.