culverts are designed according to the AASHTO specifications Most common is the H20 loading which is a 20 ton 2 axle truck. The rear axle loading is 80% of the total weight --thus 16 ton axle added to this is the impact factor and that is 30%. Therefor a semi rig with axles spaced out can go over safely. Most states limit total load of a semi to 40 ton, and if you have an R permit you can go to 60 ton.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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