If your are concerned about escaping a crash there are emergency hammers that u can stow under the seat or dash. Thay have seat belt cutters, glass beakers and can be used to pry things apart but for the car to be on it's side I imagine you would have to hit something hard enough to remove the wheel, axle, and "a arms" other wise I suspect the car would rest on more so on it's back if it ever flipped and did not come back down on its wheels
(Mind you I have no proof of this other then educated speculation)
(Mind you I have no proof of this other then educated speculation)