The way I learned it, is that some of the New England states measure the lowest clearance of an overpass from the curb height, not from the surface of the roadway. Curb heights vary from one place to another.
Watch the signs along the road. Some states tell you what the measurement is, and how it's made (check the signs along the PA turnpike). Other states don't tell you; you're supposed to know.
The only source I can think of that many drivers might normally be expected to have on hand, it the Commercial Drivers Atlas. Check the sections at the front, before the maps. There is a section devoted to the states; plan your route from here to there; then check the pages relating to each state you will drive through. The information is there.
I haven't hit one yet (knock on wood). I've had a couple of tense moments, but haven't hit one.
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Christmas! What other time of the year do you sit in front of a dead tree, and eat candy out of your socks!
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