When I was growing up, we would drive from Los Angeles to Morro Bay, which is a coastal town in Central California, stay a day, and then head onto San Francisco. My grandparents lived in San Francisco at the time, but later moved to Morro Bay. Our trip took us on Highway 101, which had beautiful views of the ocean.
But it had a big problem, too. The road cut through these huge sloping mountains. Always brown from the dryness, and some years, black, because brush fires had burned away the grass. Nothing to anchor down the dirt when it rained.
One year, it was pouring rain and we were headed back to Los Angeles. A state trooper stopped us, dressed up in his yellow slicker, and told us the road was closed. We had to turn back and wait a day for it to be cleared.
A landslide happened this week in the same general area and closed a quarter mile of the freeway. Check out the video in the link.