Put a railroad in the area with a message about the construction status in the name. I may stop a few well-meaning people from altering it.
Sorry if my previous message was a little harsh, was just a little frustrated by it. It doesn't help that the new traffic pattern they are putting in makes absolutely no sense. A 6 lane one way loop at 45 mph, with two 90 degrees turns surrounding a downtown of only 6 blocks. They're essentially turning downtown into a giant median island.
I had a railroad in the area and someone came along and deleted it within the day before, but it was unlocked.
I put a bigger one in this time and locked it, so hopefully it'll stick this time.