We need to build special roads so self driving cars can navigate properly.
You could even connect self driving cars together, by letting the front car pull them the others could save their batteries.
And with these "trains" of self driving cars pulling each other, you wouldn't have to build the self driving car roads very wide, they could just run on narrow "tracks" for the wheels.
Then we'd have more space for human stuff instead of car stuff like roads and parking lots everywhere.
He's done it again. Elon Musk is a god damn genius.