yes by individual overload permits a much heavier load is allowed because it happens infrequently and there is residual strength over normal strength needed. typical is a R permit which allows the 40 ton vehicle to go up to 60 tons. I once permitted a 300 ton load go over a drawbridge posted at 20 tons. It all depended on the number of axles--distance apart, speed, and location of truck on the bridge..That permit took me a week of calculations to determine the stresses. Interstate highways were designed for heavier loads and higher clearances--mainly due to anticipated military movements
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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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