I read an article talking about the legal aspects of owning a self driving car, ie who's at fault if it hits someone etc. There is a whole load of laws already in place for something very similar - a horse, of course!
Basically a horse and a self driving car are very similar in that they have some degree of intelligence, and people are expected to treat them in a certain way due to common sense. Jumping out in front of a horse and you take the risk of getting hurt as the owner is only partially in control. Stand behind one and you may get kicked, and if the horse is out of control you are expected to try and avoid it accordingly. Will be interesting to see when the first court cases come in, apparently lawyers are already drawing parallels between the two and rubbing their hands.