How long is it safe to ignore a slip in the road?

As previously mentioned, I have about seven miles of narrow country road to drive before I get to the highway. Mostly a pleasant drive, apart from the nippleheads who canNOT stay on their own side of the road, there is still something to be desired.
There are some very big slips on the road. One has been “repaired”, or at least bandaided, and one has also a partial fix. I saw some very long pieces of angle iron on the side of the road for several days, which I assume were driven into the mountain next to the slip.
Recently, I’ve noticed what looks like a slip about to happen on the other side of the road a bit further down. It’s about fifteen feet long and the drop is straight down. I’m not sure how far, but enough that a car dropping off of it could be potentially fatal.
Is there a standard to which the road commission is held, or an SOP that allows or mandates when a slip needs to be fixed?
What is considered fixed and what is considered a temporary life/auto saver until complete repairs can be made?