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I'm going to get shouted at for saying this, but I don't think the descent was that bad. The UCI should've ensured that the dangers, which are the huge gutters, should've been addressed, but I assume the local climate means that they are essential to manage rainfall. I'm happy to be proven wrong, but no-one complained about the descent after the test event last summer.
Most of the cyclists have been out there for a week, they should've ensured they memorised the worst corners before the race. Obviously Van Vleuten was racing for gold, so was taking risks, but she carried too much speed into the corner and hit the brakes hard, causing her to lose control. I genuinely hope she is okay, but the crash was her fault.
So off the top of my head Porte, Nibali, Fuglsang, Thomas and Van Vleuten all crashed and injured on that descent, I personally never ever want to see an athlete go through what Van Vleuten had to, that is surely the most unsuitable course for a road race. Technical descents ok, but not murderous one. Boardman warned of the risk having ridden it, very poor judgement from race organisers and UCI.