Drove the Coast Road in 2000. Aim to do it again soon. It will never be stable, and they knew it when they built it. However, it’s worth the trouble to rebuild it when necessary. One of the great drives in the entire world.
As geologists say, "All hills want to be flat."
When I lived in California and drove on Highway 1, I noted that the outside lane was missing in several places. I concluded that the only safe drive was to go north so I would be on the inside lane.