Clelles - Col du Preyet - Chatillion-en-Diois Fairly devoid of traffic, this is relatively narrow and often bumpy, but certainly very scenic. Speeds are relatively low, as the corners are often blind, and had a lot of gravel from road repairs when we were there. Still, on a good day the roads is pretty interesting, and along with Col de Grimone make an alternative to the main road N75 from Croix-Haute.