Unable to answer "What is the name of this road?" for https://osm.org/way/247203177 via StreetComplete 38.2:

Contournement d'îlot central.

The path is closed by a locked fence because the forest is managed for long-term developement.
I have no idea how to 'map' this so here's my little note. I hope it helps. I'll copy paste on the other end of the path where I actually saw the locked fence as well.
(I had to get around the zone on a bike tour)