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A cab over semi-tractor. Tractor with an end-dump trailer. A FAW semi-trailer truck in China. A semi-trailer truck[ 1] (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. A tractor unit pulling a semi-trailer. A truck pulling a semitrailer using a trailer dolly. A semi-trailer is a trailer without a front axle. The combination of a semi-trailer and a tractor truck is called a semi-trailer truck (also known simply as a "semi-trailer", "tractor trailer", or "semi" in the United States ). [1]
Semis, big-rigs, or tractor-trailers—whatever you call them—are ubiquitous on American roadways and are the most common means of transport for goods in the country. But 18-wheelers can ...
The typical 5-axle tractor-trailer combination, also called a "semi" or "18-wheeler", is a Class 8 vehicle. [29] Standard trailers vary in length from 8 ft (2.4 m) containers to 57 ft (17 m) van trailers, with the most common length being the 53 ft (16 m) trailer. [30] Specialized trailers for oversized loads can be considerably longer.
The tractor–trailer combination distributes a load across multiple axles while being more maneuverable than an equivalently sized rigid truck. The most common trailer attachment system is a fifth-wheel coupling, allowing a rapid shift between trailers performing different functions, such as a bulk tipper and box trailer.
A common property-carrying commercial vehicle in the United States is the tractor-trailer, also known as an "18-wheeler" or "semi". The trucking industry serves the American economy by transporting large quantities of raw materials, works in process, and finished goods over land—typically from manufacturing plants to retail distribution centers.
A road train, also known as a land train or long combination vehicle (LCV) is a semi-truck used to move road freight more efficiently than single-trailer semi-trucks. It consists of one semi-trailer or more connected together with or without a tractor. [1] It typically has to be at least three trailers and one tractor.
“A tractor trailer unit carrying paper became delayed in traffic and was unable to clear the railroad crossing when an oncoming Amtrak train collided with the trailer,” the North Haven Fir.
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