For families traveling with small children who need car seats, it would be a PITA to have to re-install the car seat every friggin' time we got in a car. Furthermore, many car seats do not fit well in smaller cars. We've already discovered that we cannot have a rear-facing car seat in back of anyone but me (because I have short legs and don't mind the seat being scrunched all the way up to the front of the car). And these days kids are supposed to be rear-facing until at least the age of two. At the same time, parents with kids in the back are some of the most distracted drivers, so an autonomous car would work very well for them. They could attend to the kids while the car drove itself. However, because of the car seat issue (plus stocking the car with all sorts of kiddie goodies from diapers to toys), it wouldn't work well to "borrow" one every time the kids need to go somewhere - families would need to own their own autonomous cars.