While driving through the coal country in eastern Kentucky a few years ago, I was either amused or concerned by the weight limits posted on bridges. The signs, posted as you crossed bridges over creeks, gorges, or whatever, would read (I've forgotten the exact numbers, but something like) "weight limit 30 tons - if coal,60 tons. I had to wonder was the bridge built for 30 or 60, and if not for 60, had the structure been degraded by privileged 60 ton trucks so that I was going to fall into the gorge? Sure is a beautiful place.

Chet