Just how fast would a motorcycle have to be traveling in order to flip a Prius? It’s not a huge vehicle, but not that small.
Around 90 or less could do it. Depends on the weight of the motorcycle etc...
There have been other cases where motorcyclist bodies compromised windshields, rear windows etc, and the body kills all the on the occupants in the car. Like a bomb going off. A a 200 pound object flying through the interior of your car at 100+ miles per hour. These tend to be horrific scenes.
Lots of impact energy forces at work. Like the female who rolled her vehicle at about 80mph on a freeway in LA, no seat belt, and the forces were so great she was ejected on the 3rd roll, and flew about 30 feet up into the air, and the victim actually landed on a catwalk, on top of an overhead freeway sign.