Maybe if cars could fly, they could sort themselves at different heights so that they would never hit each other. And also communicate with others to make sure

Maybe if cars could fly, they could sort themselves at different heights so that they would never hit each other. And also communicate with others to make sure there are no collision courses. Tall buildings could be a problem. But it should be way easier problem to solve then city street driving. Because it would be a new tech we could require all flying cars to be autonomous and only allow manual control in case of emergency.