Underground wall on Rhône bridge

This is a legal graffiti wall in Arles. Provided by users of legal-walls.net.

Is this wall really legal?
View the comments and check this post for tips. If it's public property, you should get in touch with local authorities. For private property, just contact the owner.

Where does this information come from?
Legal-walls is a crowd-sourced community. If you believe the wall is no longer there, or not legal, leave a comment by clicking the link below.