well the theory of how self driving cars would eventually become is if you have an app that can order a self driving vehicle, the closest one to you will be there for you. you can set the time you need it ready by and it will be there. we kinda already do that now with transportation apps, but with self driving cars i think it would be more efficient. idk. i guess owning, driving, and parking your own car will probably always be a little faster because its in the parking lot of your store or of your house right where you left it, but it wouldn't be that much faster.