From the stories I've heard of the HHH... that's pretty normal when the temps hit 100+. Get 12000 of just about anything going in the same direction at the same time and accidents are going to happen. Collin Classic this summer looked much the same though in terms of the dead and dying laying on the side of the road. Fewer numbers, but probably much the same % of participants. I survived the 100k, but I have little doubt I would have been in serious trouble had I gone for 100mi.