I know exactlythe scenario you describe since one of my old routes was like that. I can verify that that would be a dumb attempt. and no I have tried that. Mine was a old P1000 and I could just get under the thing. It was one of those that hang from chains and swings.It doesn't work when you have an 11 foot tall P800 and a 9 1/2 foot high railroad overpass. I know 2 drivers who have unsuccessfully attempted this technique. Also, management frowns upon this procedure.
Dill did you call for help for that over 70?