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CMVs are restricted by gross weight (total weight of vehicle and cargo), and by axle weight (i.e., the weight carried by each tire). The federal weight limits for CMVs are 80,000 pounds (36,000 kg) for gross weight (unless the bridge formula dictates a lower limit), 34,000 pounds (15,000 kg) for a tandem axle, and 20,000 pounds (9,100 kg) for a ...
Conventional style cab tractor A cab-over semi-tractor Tractor with an end-dump trailer A FAW semi-trailer truck in China 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. Other terms There are a ...
The typical 5-axle tractor-trailer combination, also called a "semi" or "18-wheeler", is a Class 8 vehicle. [30] 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. [31] Specialized trailers for oversized loads can be considerably longer.
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] A large proportion of a semi-trailer's weight is supported by a tractor unit, or a detachable front-axle assembly known as a dolly, or the tail of another trailer ...
The overall length is 15.8 m, the deck length is 10.58 m; the deck width is 3.05 m, 3.66 m for a wide deck version. [13] [14] The M1070 and M1000 are both air-transportable by C-5 Galaxy or C-17 Globemaster III aircraft. [6] The next generation trailer with the M1300 is the M1302, this supplied by Broshuis BV from The Netherlands.
There were three wheelbases (Measurements are from the centerline of the front axle to the centerline of rear tandem). The short, used for tractors and dumps, was 167 inches (4.24 m), the long, used for cargo, wreckers, and bolsters, was 179 inches (4.55 m), and the extra long, used for long cargo, tractor wreckers, and expansible vans, was 215 ...
Semi-tractor/trailers have to stay on relatively flat ground, and are not rated for full off-road use. On improved roads they could tow up to 55,000 lb (25,000 kg) with 25,000 lb (11,000 kg) on their fifth wheel. [7] [14] Tractor trucks normally towed a 12-ton, 2-axle trailer. There were stake and platform, van, low-bed, and tanker bodies.
A set forward axle, with the tires immediately behind a straight bumper, is used when overall length is limited or when wheelbase has to be as long as possible for bridge-formula laws. Set back axles, where the hood extends in front of the axle, are used when maneuverability is more important than length or weight distribution.