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In the United States, a commercial driver's license is required to drive any type of commercial vehicle weighing 26,001 lb (11,794 kg) or more. In 2006 the US trucking industry employed 1.8 million drivers of heavy trucks.
Business routes always have the same number as the routes they parallel. For example, U.S. 1 Business is a loop off, and paralleling, U.S. Route 1, and Interstate 40 Business is a loop off, and paralleling, Interstate 40.
The American Association of State Highway and Transportation Officials (AASHTO) is an influential association as an advocate for transportation. Setting important standards, they are responsible for publishing specifications, test protocols, and guidelines. All whichare usedin highway design and construction throughout the United States. Despite its name, the association represents more thansolelyhighways. Alongside highways, they focus on air, rail, water, and public transportation as well.
The Federal-Aid Highway Amendments of 1974 established a federalmaximum gross vehicle weight of 80,000 pounds (36,000 kg).It also introduced a sliding scale of truck weight-to-length ratios based on the bridge formula. Although, they did not establish a federalminimumweight limit.By failing to establish a federal regulation, six contiguous in the Mississippi Valley rebelled.Becoming known as the "barrier state", they refused to increase their Interstate weight limits to 80,000 pounds.Due to this, the trucking industry faced a barrier to efficient cross-country interstate commerce.