Read a book some time ago..a spy book as I recall, either a James Bond or Sam Durell...where someone was sent down a bob sled chute without a ride.
The statement was that, even should someone stay in the chute, they would be killed by the pummeling they would receive on the unprotected ride to the bottom.
Over the years I've watched the associated sports with that thought in mind and simply cannot believe that a course would be designed with such hazards.
Even football fields in the US have the goal posts offset to avoid this type of injury...and that is at "running speed" not the near 100 mph of the luge.