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In Lansing, Michigan, it’s not uncommon to see trucks hauling double trailer loads filled to capacity with aggregate. These vehicles are often associated with the local dirt, rock, and gravel companies that are a prominent feature of the area. A quick online check reveals that Michigan permits a maximum gross vehicle weight of 164,000 lb, a figure that is more than double the federal maximum of 80,000 lb. This discrepancy has led to speculation about its potential impact on the state’s road quality…