Stephan- I was referring to an earlier post by Atlas where he mentioned a hypothetical long distance trip from Barcelona to Toulouse.

"I propose beginning a bike tour in Barcelona and finishing in Toulouse via Andorra."

Those unpaved roads in your screenshot aren't headed in that direction and seem to be unsigned. I was expressing how beautiful, quiet & well signed the small paved D routes are in France as in my Street View screenshot above, with no need to seek out gravel or pre-mapped routes such as Euro-Velo.