I believe that interstate bridges are designed for far greater loads than the standard 40 ton freight hauler. I have hauled loads in excess of 200,000 pounds over 1,000 of miles of interstate highways legally with " special haul permits" issued by various states D.O.T. departments. Very occasionally was a detour required due to a weak bridge, so I assume the state engineers that approve the superload permits have confidence that the structures will support that weight. It was much more common to have speed restrictions on bridge structures. Detours off the interstates are much more common for over height loads, than heavy loads!
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Today's Featured Article - Grain Threshing in the Early 40's - by Pat Browning. The setting is rural Wisconsin, halfway between East Troy and Elkhorn, on Hodunk Road, our nation was at war, and I was 6, 7 and 8 years old. George was our "threshing neighbor." He was the one with the threshing machine, a JI Case on steel wheels, and he pulled it to our farm with a JI Case standard tractor also on steel. In those days, steel wheeled implements were common. The roads were general gravel, so the lugs cutting into them wasn't a problem. George would set up the thresher, s
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