China has started using electric drones for transport. It's still quite new and a novelty, but these "flying cars" might be a better solution than roads and tires.

They do take up more space than cars when parked and I have no idea of how they are supposed to navigate if/when there's more of them, but overall I think it's an interesting idea. Flying cars have been a joke since the 1950, but now that they're actually available, I'm really hoping they take off.