[username135]

If I had to guess, all things equal, its probably much thicker than your average driveway.

[stephen_g]

Yes, for example taxiways and aprons designed to take the weight of large aircraft like A380s can be ~470mm (almost half a metre) thick, and that's only half of the structure with the subgrade and sub-base together being about as thick! Whereas the standard for driveways where I live is 125mm thick.