What the books do NOT tell you is the high railroad tracks and crowned intersections you can get hung up on. Or the intelligently designed intersections with islands, signs, and stop signs placed where the trailer or load needs to be to make the corner.
Route surveys can be your best friend. Do NOT trust the books or maps, and NEVER trust the signs with bridge heights. Measure if you are going to be close. Bridges get expensive to replace after you drive your escavator into them.