There are a lot of roads where I live that are one lane, with passing places. Or most of the time both drivers have to aim for a wide-ish part of the road and both bump up the hedge a bit. God knows how Google car will do that, half the tourists have problems figuring it out.
It's common to meet a car, both pause while the drivers try to figure out who has a better chance of reversing 500 wiggly metres to a passing place. If you meet an old lady, man, just stick it in reverse and drive as far as you need, waiting for her to even find reverse is pointless.
Quite a lot of those here in Scotland - and there is a fair amount of etiquette around how to drive properly on them without other people (locals) getting very annoyed with you.
I can't see any reason why self driving cars couldn't manage single track with passing places better than people - especially if they knew where the passing places are and could communicate with other cars.
It's common to meet a car, both pause while the drivers try to figure out who has a better chance of reversing 500 wiggly metres to a passing place. If you meet an old lady, man, just stick it in reverse and drive as far as you need, waiting for her to even find reverse is pointless.