First, most of the roads are narrow and unpaved. I don't think any self driving car would be able to negotiate passing an oncoming farmer's tractor -- they're really big -- on any of these roads without driving off into the ditch.
Second, FUCKING WINTER, when only knowing where the road goes helps one get through. And no, GPS ain't going to help on this one. A self-driving car won't know that it is about to drive into a three foot snow drift over the road.
I can drive Grass Lake Road throughout the year. It is very narrow, twisty curvy, and at one point is lower than the level of Grass Lake whose edge is within three feet of the road. There is always water on the road there. But that is the most direct route from my house to a great place to eat, best fish and chips anywhere.
No! Self-driving cars are as useful as video phones, that is, not at all. There are too damned many places where they are untested and they will fail. Mainly any place which experiences fucking winter. And let's not even talk about big Semis driving across a mountain pass.