I wonder what problem the original sign addressed. Because forbidding turning right for 2 Β½ hours every morning sounds extremely specific, and sounds like one neighbor in particular had some beef with another or something, and got the city to put up the sign.
And maybe that neighbor left, or whichever problem was being addressed didn't exist anymore.
I know that's a thing because a long time ago, we had a "15mph - blind children at play" sign in our street, until someone pointed out that the blind child in question was now an adult and had moved out years ago, and the sign was just annoying everybody for nothing π
In other words, the guy might have replaced a useless sign with another, equally useless one on his own dime. Maybe he could simply have called the city to wonder what the sign was for, and possibly have it reviewed and removed altogether.