A highway bridge at 7 ft., 7 in. -- what could go wrong?

I just bought the Rand McNally Motor Carrier road atlas because of just this type of problem. While planning my trips, I will know which roads are and aren't tall vehicle friendly. I saw this suggested on a Youtube video by an RV guy and thought it was a great idea. I also have the truckers Garmin and put in my height so it avoids any roads with known low bridges etc.