short story.
years back when I lived in S.Ca. I was coming up the Santa Susana pass road from the S. Fernando valley side from topango cyn side on my way home .
Half way up must of been about 5-6 cyclist really don't remeber how many but the road has a S-type turn with a sharp pin type turn that if you hit it just right it is like being blown out of a cannnon just a super amount of increase speed before the descent to topanga cyn, the middle rider mis-judged the turn slammed into the rock face type cliff, the side of his head and shoulder took the burnt of the impact.
split his head opeen like a watemelon.
Long story short he fractured his skull in so many places he was leaking out cerebrum fluid from his skull. I stayed there as did the other riders unitl emergeny crews got there. Don't know if he lived, but with the impact he had, I don't believe he would ever have been the same.
up to each individual I guess.