Neat OZ Stop Sign
http://www.youtube.com/watch?v=NoTMC-uxJoo- a pretty neat stop sign for truckers who ignore low overhead signs. The water screen projection makes it *real* hard to ignore :).
Forum Discussion
Why not build a concrete abutment that is as low as the tunnel opening about a quarter mile back, then a too tall truck will hit the abutment instead of the tunnel opening. That would have to be cheaper to fix than a tunnel. And it would work even if they ignored the signs.
