You’re now saying ‘… assuming the vehicle is low enough to go under the signposted bridge height…’ Now you’re making assumptions that the OP never mentioned.
I go back to my original point, which is, if you’re not sure, don’t do it. Neither is driving a truck under a bridge to see if it will fit, which is what you seem to be advising 
. But I can’t be arsed arguing this anymore, so tell you what: You do it your way, and I’ll do it mine.
End of.