Those are insane speeds!
I had a boss at INSURANCE COMPANY that was a big biker. He was telling me a story about that race across the US. During the portion that goes over the Rockies, some regular guy had a heart attack at the top of whatever mountain. The actual racers were approaching. The ambulance picked this guy up, then had a hard time staying ahead of the racers. The ambulance would pull ahead on the straight parts of the descent, but any time there were curves, the bikes would catch up and be right on the ambulance's tail.
I hope that story makes sense, seeing as I have little to no actual details.