Sure that would be nice, but that ain't happening on these kind of roads, it would be a huge effort to do that. It was on the road up to Col de la Bonette, it is relatively narrow. I also don't think this is a transit pass, only tourists and joy riders go up there really. And lots of cyclists. The road did not have much traffic at all today, and everybody seemed very careful.
If it's just for joy riding it's fine then. I'm more critical of valley roads where there is a lot of traffic. It's not because cars have reigned supreme there for decades there that we shouldn't adapt the infrastructure for bikes.
It's a lot of work for sure. But it's sustainable development.