Don't know if you recall a couple of months ago when the Linden Road through Arena vanished and I rebuilt it for you and you built some of the walls back, but only some of them.
Anyhow, I finally got bored enough to finish building the rest of the roadside barrier walls back so it's once again safe to drive through Arena without worrying about launching off the hilltop into the Lake.
I'll gladly set the walls for you to purchase for $L0, as I did the road. Just holler at me to arrange a time!
-Mac