Semi-trailer truck with 'sleeper' behind the cab Classic American Semi Trucks

"A semi-trailer truck or tractor-trailer (colloquially known as a transfer truck, 18-wheeler, semi, Diesel, Mack truck (although this is actually just one brand of truck maker), or big rig in the U.S. is an articulated truck or lorry consisting of a towing engine (tractor in the U.S., prime mover in Australia, and truck in the UK, Canada and New Zealand), and a semi-trailer (plus possible additional trailers) that carries the freight. In North America, semi tractors usually have 3 axles, the front, or "steer", axle having two wheels, and each of the two rear, "drive", axles having a pair of "dualies" (double) wheels on each side. Thus, the most common configuration of tractor has 10 wheels. A smaller tractor having a single drive axle (six wheeler) is often used to pull shorter trailers in tight urban environments, such as downtown areas where a 60-foot rig would be too difficult to maneuver. The cargo trailer usually has two "tandem" axles at the rear, each of which has dual wheels, or 8 wheels on the trailer. Many trailers are equipped with moveable tandems that can be set to balance

the weight of the trailer to stay within legal limits.

Although the cargo's weight added to the semi's weight can equal a certain amount of gross some roads are marked with a different gross restriction so the roads are not damaged. Cargos that exceed allowed weights are usually marked with overweight load and must obtain a permit to use certain roads."
This information found: Wikipedia Encylopedia

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