On the right lines?...

 Noticed recently that the white centre lines had been repainted between Barrou and Le Grand Pressigny.

It varies very little en route with the broken line only sometimes getting a little shorter.Now, in the UK  this would mean overtaking can be don from either side but don't think that  it can be the same here...

as they continue around the blind bend down into Le grand Pressigny - are they only there to divide the road?

The work was obviously carried out by the region as they stop and start exactly at the respective village signposts.