Or is it Gapping after the bridge?

http://www.liveleak.com/view?i=3c0_1351184890

Whoever put those cameras up is a GENIUS!

Whatever happened to truck (and RV) drivers actually KNOWING how tall their rig is? What a concept.

Going under a bridge with wheels is one thing but the real test is sitting at the helm on the fly-bridge and passing under a fixed bridge knowing you have 3 inches to spare and your haircut is the margin. Worse yet the other person is driving, you are the captain and are responsible for calling go/no go. You get lucky because the marginal bridge has major structure in line with the canal and your hair is in between the ties.
You call the next bridge and wait for it to rise.