I don't know a lot about the topic, how well do the current autonomous vehicles handle roads not currently on GPS , I.e private drives and such. I now understa

I don't know a lot about the topic, how well do the current autonomous vehicles handle roads not currently on GPS , I.e private drives and such. I now understand it can handle the terrain, thanks for the explanation that is pretty neat they could do it thirty years ago, just curious when I tell it to go to a house in the middle of a 20 acre property with multiple private roads, and I use the term road lightly, if it is actively going to search for a path or if it will have to have manual intervention. I have seen google cars handle well mapped streets, just curious.