K Charles wrote:
Common sense and read the sign. Know how tall your rig is.
That was a huge help to the op.... Yes there are signs on the highways to avoid low bridges and yes you should know how tall you are but that may not be enough if you get off the beaten path and roll up on something too low. I thought there was an app for this, read about it here awhile back.
I've only gotten in this situation once so far by accident, wrong turn with a 40' 5er that almost put me into a very old small town with very low hanging wires. Luckily I was able to dip off into a parking lot and get turned around.
Not always about common sense and knowing how tall you are.