While skimming thru UK news a few days ago I ran across this gem:

BBC News - M&S lorry gets stuck under York's Micklegate Bar

Guess he's been trying to deliver gates.

He forgot to dump his air bags, and let some air out of his tires first.
You learn to do that driving around Chicago.

You also let some air out of the tires if you need some quick traction in slippery winter conditions, like trying to pull a hill.