Re: No wheel is one thing
This would be madness, as it's highly likely to exclude all other road users (motorcycles, bikes, horses, pedestrians, non-self driving cars, etc)
A lot of those are already forbidden on highways, so I'm not sure that's a great argument.
So aircraft regularly fly within a few feet of each other going in opposite directions do they or are in situations where literally being a few inches out could cause a crash?
You have to take into account the fact that aircrafts go ten times faster and can be fifty times larger.