They have videos of their cars handling common cases. But what about the corner cases? I've had a sign disappear on me over night which changed the roads rules

They have videos of their cars handling common cases. But what about the corner cases? I've had a sign disappear on me over night which changed the roads rules at a tricky intersection. There has been a lot of construction in my area so 2 lane roads had a lane closed off and a traffic controller managed traffic across a single lane. I've even seen a road that you could drive into and out of, become a road that you can only drive into. There had been traffice controllers during road works managing a single lane all through construction and then the day that it was finished, one direction became a dead end.