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 - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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