I think one thing everyone is ignoring is the human element.
Think about the sheer number of truly terrible drivers you see on the road every day. Then think of them all with an extra dimension to keep track of, and all of the energy (speed and altitude) that they will have when they collide with anything.
I just barely trust pilots who don't have instrument ratings. There's no way I would trust the majority of drivers in that situation.
-soD
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