A road train, roadtrain or land train is a trucking vehicle of a type used in remote areas of Argentina, Australia, Mexico, the United States, and Canada to move freight efficiently. The term road train is most often used in Australia. In the United States, the terms triples, turnpike doubles, and Rocky Mountain doubles are commonly used for longer combination vehicles (LCVs). A road train has a relatively normal tractor unit, but instead of towing one trailer or semi-trailer, it pulls two or more of them.