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In page Semi-trailer truck:

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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),[1] while the majority of North American trucks are "conventional" (called "normal control" or "bonneted" in the UK).[2][3] 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.[citation needed]