It has already happened in Mexico City. Heading here? If so, I'm gonna need some tactical countermeasure.
https://www.technologyreview.com/s/602662/ubers-ad-toting-drones-are-heckling-drivers-stuck-in-traffic/
(https://media.boingboing.net/wp-content/uploads/2016/10/brett-gundlock.jpg)
I doubt that the DOT would allow it. Imagine the flying Coke cans, swatting broomsticks and pissed-off motorists, not to mention insurance claims when your shiny ride gets a bottle or downed drone across the roof.
In this country it would be open season, they'd be dropping out of the sky like ducks!
I think the only place you'd see them is in gridlock, in which case they would not be welcome......in 70 mph traffic they wouldn't be controllable due to wind vortices.
Is it illegal to drive nekkid? :-\
The FAA would never allow it.