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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.
Parts of a driver's work day are defined in four terms: On-duty time, off-duty time, driving time, and sleeper berth time.. FMCSA regulation §395.2 states: [5]. On-duty time is all time from when a driver begins to work or is required to be in readiness to work until the driver is relieved from work and all responsibility for performing work.
The use of the term "semi" in the name comes from the semi-trailer, a vehicle whose load is carried partly by its own axles and partly by the pulling vehicle, which is commonly included in tractor-trailer rigs. Straight truck A single vehicle, with no articulation. Normally 2 or 3 axles, sometimes with lift axles. Tractor-trailer See semi-truck.
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Starting in 1910, the development of a number of technologies gave rise to the modern trucking industry. With the advent of the gasoline-powered internal combustion engine, improvements in transmissions, the move away from chain drives to gear drives, and the development of the tractor/semi-trailer combination, shipping by truck gained in popularity. [1]
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.
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When light-duty trucks were first produced in the United States, they were rated by their payload capacity in tons: 1 ⁄ 2 (1000 pounds), 3 ⁄ 4 (1500 pounds) and 1-ton (2000 pounds). Ford had introduced the "One-Tonner" in 1938 to their line of trucks. [23] The "Three-quarter-tonner" appeared in the Ford truck lineup in 1939. [23]
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