Traffic was very busy on a Sunday morning. Unfortunately not just droves of cyclists. Motobikes in the hundreds and easily 1000 cars passed me during the ascent.
Though when I say top I really mean "large ski resort". After all the numbered hairpins of the climb the ending is an absolute anti-climax. No sign, no final point - lots of cyclists tooling around the resort looking for a finish, other cyclists gathering by any roadside sign they can find for a group photo.
My advice - don't do it on a Sunday.