(image courtesy of autocarma.files.wordpress.com)
Slick.
Although a solidly mounted steel barrier crossing the road at the proper height would stop any overheight vehicle no matter what.
A couple of plastic pipe suspended on changes works in many location for a lot less complications, expense and higher reliability.
Cars are backed up for miles.
Finally, a police car comes up. The cop gets out of his car and walks around to the truck driver, puts his hands on his hips and says, “Got stuck, huh?”
The truck driver says, “No, I was delivering this bridge and ran out of gas.”
Sorry, officer, I didn’t see the stop sign.