It's pretty amazing what the human body can survive...NASCAR's Hardest Crash:
Sebastien Bourdais' recent wreck at Indianapolis sustained an astonishing 118 G's at impact. That's 118 times the normal force of gravity and for a brief instant he was subjected to a force 118 times his body weight. The crash was only slightly less severe than James Hinchcliffe's crash at Indy in 2015 which measured 126 G's. Kenny Brack's accident at Texas in 2003 measured 193 G's, nearly double the 'force' of any other IndyCar crash to that point. Some sources say that Brack's crash was the highest G-force a human has ever survived...
Edit See the end of this article...link...for some figures from F1.