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xkcd #3124: Grounded
(imgs.xkcd.com)
Title text:
We should have you at the gate in just under two hours--two and a half if we get pulled over.
Transcript:
Transcript will show once it’s been added to explainxkcd.com
Source: https://xkcd.com/3124/
Well, not really. Or technically, they can if they move fast enough. If they stop, wherever they are will stop being a road quickly.
And there's that entire problem of making room for the wings. It's one of the largest problems when designing airports.
"Beep beep I'm a plane!"
Yes, the wings are a huge problem. Not that many roads can handle something as wide as a plane.