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  2. Trucking industry in the United States - Wikipedia

    en.wikipedia.org/wiki/Trucking_industry_in_the...

    A common property-carrying commercial vehicle in the United States is the tractor-trailer, also known as an "18-wheeler" or "semi".. The trucking industry serves the American economy by transporting large quantities of raw materials, works in process, and finished goods over land—typically from manufacturing plants to retail distribution centers.

  3. Vehicle inspection - Wikipedia

    en.wikipedia.org/wiki/Vehicle_inspection

    Vehicle inspection is a procedure mandated by national or subnational governments in many countries, in which a vehicle is inspected to ensure that it conforms to regulations governing safety, emissions, or both. Inspection can be required at various times, e.g., periodically or on the transfer of title to a vehicle.

  4. California Smog Check Program - Wikipedia

    en.wikipedia.org/wiki/California_Smog_Check_Program

    The program is a joint effort between the California Air Resources Board, the California Bureau of Automotive Repair, and the California Department of Motor Vehicles. A Smog Check is not required for electric, diesel powered manufactured before 1998 or weighing over 14,000 lbs, trailers, motorcycles, or gasoline powered vehicles 1975 or older ...

  5. Semi-trailer truck - Wikipedia

    en.wikipedia.org/wiki/Semi-trailer_truck

    Conventional style cab tractor A cab-over semi-tractor Tractor with an end-dump trailer A FAW semi-trailer truck in China A semi-trailer truck (also known by a wide variety of other terms – see below) is the combination of a tractor unit and one or more semi-trailers to carry freight. A semi-trailer attaches to the tractor with a type of hitch called a fifth wheel. Other terms There are a ...

  6. Semi-trailer - Wikipedia

    en.wikipedia.org/wiki/Semi-trailer

    The combination of a semi-trailer and a tractor truck is called a semi-trailer truck (also known simply as a "semi-trailer", "tractor trailer", or "semi" in the United States). [1] A large proportion of a semi-trailer's weight is supported by a tractor unit, or a detachable front-axle assembly known as a dolly, or the tail of another trailer ...

  7. Federal Bridge Gross Weight Formula - Wikipedia

    en.wikipedia.org/wiki/Federal_Bridge_Gross...

    This exception was sought by the American Trucking Associations so trucking companies could use 40-foot (12.2 m) trailers and weigh 80,000 pounds (36,000 kg). It was the only way tank truck operators could reach 80,000 pounds without adding axles to their fleets of trailers already in operation. [26]