3rd will now end at the new gate. You will no longer turn left on Alameda to get to the entrance. From the drawings, it looks like you will still exit at the old gate and continue straight down 4th.
It doesn’t sound like much is happening with the tunnel.
I think the measure to restrict splitting lots passed. However, there will be legal issues with it. I thought it was BS and a classic example of, “I’ve got mine and now I’m going to prevent others from having it too.”