Car pulling trailer on road postcard

Car pulling trailer on road. Copyright: Stockbyte _x000D_ _x000D_ A semi-trailer truck , also known as a semi , tractor-trailer , truck and trailer , transfer truck , 18-wheeler , mack truck , big rig (US), transport (Canada), artic (UK and Ireland), or lorry (UK), is an articulated vehicle consisting of a towing engine (tractor in the United States , prime mover in Australia or truck in Ireland , the United Kingdom , Canada and New Zealand ), and a semi-trailer (plus possible additional trailers ) that carries the freight. A semi -trailer does not trail completely behind the towing vehicle, but is attached at a point that is just forward of the rear-most axle of the towing unit, so that some fraction of the weight of the trailer is carried by the prime mover, with most of that at the rear axle (s) of the prime mover, but a small amount at the front axle (s). This arrangement requires both tractor and semi-trailer to be distinct in design from a rigid truck and trailer. _x000D_ _x000D_ This page is not affiliated with, or endorsed by, anyone associated with the topic.