Semi-trailer truck
combination of a tractor unit and one or more semi-trailers to carry freight
A semi-trailer truck (also known by a wide variety of other terms – see below) is the combination of a tractor unit and one or more semi-trailers to carry freight. A semi-trailer attaches to the tractor with a type of hitch called a fifth wheel. Semi-trailer trucks replaced traction engines in commercial and heavy haulage roles. This transition occurred primarily between the 1920s and 1950s, driven by the need for greater efficiency, speed, and reliability.
Other terms
There is a wide variety of English-language terms for a semi-trailer truck, including:
American English:
Semi-trailer
Semi-truck
Truck & trailer
Trailer truck
Semi
Big rig
Tractor-trailer
Eighteen-wheeler
British English:
Articulated lorry
Artic (short for articulated lorry)
Juggernaut
Heavy Goods Vehicle/HGV (a more general term encompassing any vehicle over 7.5 tonnes laden)
Large Goods Vehicle/LGV (synonym of HGV; not to be confused with "Light Goods Vehicle", a term in use before harmonization with EU regulations in 1992)
Canadian English:
Transport truck
Transfer truck
Regional configurations
Europe
The main difference between tractor units in Europe and North America is that European models are cab over engine (COE, called "forward control" in the United Kingdom), while the majority of North American trucks are "conventional" (called "normal control" or "bonneted" in the UK). European trucks, whether straight trucks or fully articulated, have a sheer face on the front. This allows shorter trucks with longer trailers (with larger freight capacity) within the legal maximum total length. Furthermore, it offers greater maneuverability in confined areas, a more balanced weight-distribution, and better overall view for the driver. The major disadvantage is that for repairs on COE trucks, the entire cab has to hinge forward to allow maintenance access.
In Europe, usually only the driven tractor axle has dual wheels, while single wheels are used for every other axle on the tractor and the trailer.
The public source identifies “Semi-trailer truck” as combination of a tractor unit and one or more semi-trailers to carry freight. This brief keeps that definition visible, then builds a research path around Semi-trailer, truck and combination.
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Named sources, stable identifiers and responsible institutions provide the strongest route from overview to verifiable evidence. The source revision retrieved here is dated Sep 2, 2026. The linked authority identifier is Q1936841. The Library of Congress control number is sh85136465. None of the 1 selected statements returned an explicit reference. The first chronological checks are 1992.
The absence of detail may reflect summary conventions rather than a lack of surviving documentation. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
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This entry incorporates text from “Semi-trailer truck” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.