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Reference.org
Semi-trailer truck
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<p>A semi-trailer truck (also known by a wide variety of other terms – see below) is the combination of a <a href="/facts/Tractor_unit/NU8CNXkC">tractor unit</a> and one or more <a href="/facts/Semi-trailer/p2E4Lumj">semi-trailers</a> to carry <a href="/facts/Freight/0aDk22Yl">freight</a>. A semi-trailer attaches to the tractor with a type of <a href="/facts/Tow_hitch/CnU2ey5H">hitch</a> called a <i><a href="/facts/Fifth-wheel_coupling/URuF2GHK">fifth wheel</a></i>. </p>