Just for a few things to think about...
Why do you park in a drive way and drive in a park way?
How would you phrase this? Which one is correct?
Drive over an underpass, and under an overpass?
or
Drive under an underpass and over an overpass?
As confusing as this is, , I would drive ON an overpass!
I think you park on a drive way is derived from "drive away", as in thats where you park until your ready to drive away, but I'm not sure.
And perhaps I'm just feeling WAY to analytical to be posting this right now!