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It is easy to ask for longer and heavier trucks. But before granting this the questions about road and bridge load carrying capacity should be answered. According to the linked report 39% of the bridges are 50 years and older, an additional 15% are between 40 and 49 years old. 9.1% of the highway bridges are structurally deficient already. [url]<a>https://www.infrastructurereportcard.org/wp-content/uploads/2017/01/Bridges-Final.pdf[/url]</a> The following load was required from 1944 to 1993 (AASHTO HS20-44): <a href="https://image.slidesharecdn.com/3danalysisoftrussbridges-12736769187-phpapp01/95/3d-analysis-of-truss-bridges-5-1024.jpg?cb=1280761459">https://image.slidesharecdn.com/3danalysisoftrussbridges-12736769187-phpapp01/95/3d-analysis-of-truss-bridges-5-1024.jpg?cb=1280761459</a> Concentrated and liniear distributed load were not calculated simultanously until ASHHTO HL93. So many bridges more than 25 years old might get problematic. These design limitations produce some for European eyes weird looking combinations. We have the same request here in Germany. But it is already clear that if the trucks get longer the weight limit will stay unchanged. These trucks are only interesting for loads where volume maxes out before the load does. Regards, Volker Edit: I tried to make the first link clickable, but it didn't work. Please copy and paste into the adress field of your browser. Sorry
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