I rode all around the site that night, and considered riding down the steep drop where the wall was being removed. I didn't consider it for very long.

Notice the cables that hold the wall and keep it from falling to the ground.

After riding around, I decided they are not going to make the wall (highway) any wider, but are just rebuilding it stronger than it would be if they just pour new concrete on the thing. Since the entire highway surface is being repaved, might as well build new retaining walls.