From green roofs to multi use roofing – this driving school on top of a Tokyo building illustrates creative use of existing buildings. One wonders if there would be any additional insurance requirements for the instructors.
Source: Worldchanging
Fairsnape
Martin Brown
Fairsnape 
That’s nothing new, the old Lingotto FIAT factory in Turin had a test track on the roof in 1923.
And these days (now that it’s no longer a car plant) it’s a jogging track for the hotel occupying part of the building. That said, the banked corners were a little too steep for my liking when I tried it out last year – http://www.mcqn.net/mcfilter/archives/personal/nessun_integrale.html
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