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In the UK, tractor unit and trailer combinations are referred to as articulated lorries, or "artics". [1]A semi-trailer truck, also known as a semitruck, [1] (or semi, [2] eighteen-wheeler, [3] big rig, [4] tractor-trailer [5] or, by synecdoche, a semitrailer) [6] [a] is the combination of a tractor unit and one or more semi-trailers to carry freight.
Solaris Urbino 18 in Warsaw, Poland (2018). First example of the articulated bus appeared in Milan in 1937.In 1938, Twin Coach built an articulated bus for the city of Baltimore; this bus, which had four axles on a 47 ft (14.33 m) long body, was only articulated in the vertical direction to accommodate steep grades. 15 examples of the "Super Twin" were built in 1948, but it was not developed ...
A semi-trailer truck (Renault Magnum) of Ninatrans in London, EnglandThe 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), [9] while the majority of North American trucks are "conventional" (called "normal control" or "bonneted" in the UK).
Peterbilt 386 sleeper-cab–style commercial 6×4 tractor unit. A tractor unit, also known as a truck unit, lorry unit, power unit, prime mover, ten-wheeler, semi-tractor, semi-truck, semi-lorry, tractor cab, truck cab, lorry cab, big rig tractor, big rig truck or big rig lorry or simply a tractor, truck, lorry, semi, big rig or rig, is a characteristically heavy-duty towing engine that ...
(This often referred to as a "Rigid Heavy Goods Vehicle" or "Rigid truck" licence) Class C1E allows for a class B or C1 vehicle and a trailer of more than 750 kg GTWR, so long as the combined gross weight does not exceed 12 000 kg. Class CE removes all weight limits for a Class C vehicle with trailer. (known as an "Articulated Heavy Goods ...
Visualization of the ice and snow covering Earth's northern and southern polar regions Northern Hemisphere permafrost (permanently frozen ground) in purple. The polar regions, also called the frigid zones or polar zones, of Earth are Earth's polar ice caps, the regions of the planet that surround its geographical poles (the North and South Poles), lying within the polar circles.
The North Frigid Zone, between the North Pole at 90° N and the Arctic Circle at 66°33′50.3″ N, covers 4.12% of Earth's surface. The North Temperate Zone, between the Arctic Circle at 66°33′50.3″ N and the Tropic of Cancer at 23°26′09.7″ N, covers 25.99% of Earth's surface.
Rigidity is the property of a structure that it does not bend or flex under an applied force. The opposite of rigidity is flexibility.In structural rigidity theory, structures are formed by collections of objects that are themselves rigid bodies, often assumed to take simple geometric forms such as straight rods (line segments), with pairs of objects connected by flexible hinges.