Many years ago, my family went to Colorado for a reunion. We did some sightseeing while we were there, of course, which included a drive on something called the Serpentine Road (an apt description). It was at the bottom of an incredibly tall canyon and so narrow that it was one-way. Near the end of the drive, the road passed under a road bridge which was waaaaay up at the top of the canyon. On that bridge was a sign which required binoculars to read. It said "Clearance 97 Feet." Useless, but probably required by law. As Mr. Bumble said, "The law is an ass."

Jeffp