One thing is for sure between all of us internet professional bike racers and the actual item, Spanish roads are some of the most reconned in all of cycling, the country is home for many teams and training ground for teams based elsewhere, this race is heavy on Spanish conti squads and it's guaranteed that almost everyone is familiar or semi familiar with the road conditions.
Saying anything about excessive dangerous conditions is silly, and real on the ground conditions could have been way way worse w the race seeing rain and hale earlier. Spain is a cycling paradise, give or take crashing into a cement drainage culvert. Many of the guys in the ditch probably rode up and down this road before, or one identical to it.