[johnco]

when I was in jr high, the highway dept put a large I beam at the foot of the bridge the exact height of the bridge truss. I told my friends that it wasn't right. sitting there eating lunch we watched the first semi pass get jammed halfway the trailer. couple days later they put the beam right back up and another truck jammed. seems that if an eight grader just looking at the installation could figure out a truck going up the bridge would raise the height of the trailer as it passed under the beam, people with engineering degrees could have figured it out on paper first. and at least by the second jammed truck realize it wasn't going to work. after several more jammed trucks it was later taken down and backed away from the bridge. problem solved