semi-trailer rig

Encyclopedia Article


A large transport truck that consists of a tractor unit in the front onto which one or more wheeled freight trailers can be hitched. These trucks are called semi-trailer because the cargo units only have wheels in the back, and their front part must be attached to the towing tractor.

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"Freightliner Classic Semi-Trailer, June 6, 2010" by Frank Deanrdo is licensed under CC BY.

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