I was riding some of the course and had stopped in the road near the trail where Utah crashed. As soon as people came out saying someone got hurt, the volunteers and organizers were on top of things. They were on the phone as soon as the first riders came thru and they had a truck and ambulance ready to get him. When I heard it was Utah, they also gave me a lift back to the start so I could get his phone and keys and stuff and get the hospital info over to Allison.
So I can't say anything about course markings but I'll give them credit for being ready for an accident.