it's an interesting problem, you should suggest it to the engineers now so when this actually comes out they will have solved it. I think there will be a lot of funny stories of these things driving off the road or far afield where there is an inaccuracy in the map or bad data. As someone who can't drive themselves besides the problem of knowing exactly where the car is this should be great for you since it will be much cheaper than a human driver. How do you avoid getting hit by electric cars you can't hear?