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Well, the body survives, but you die anyway because of the massive g-forces of the crash. The brain slamming in to the skull at 70mph.
Oh well, at least you'll have a pretty corpse!
Seriously, They should build "nascar" style cages and design the car around those. Of course, without all the cross bars, etc.. Would take some engineering, and would change the way cars look, the chassis would be several times more stiff and crashes would be more survivable.
Not that I'm a nascar fan, but they do have some of the best cages.