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Standard maximum vehicle lengths for trailers with one axle set are: Semi-trailer: 19 m (62 ft) Simple: 22 m (72 ft) Pole: 20 m (66 ft) Trailers with two axle sets can be 20 m (66 ft) long, including heavy rigid vehicles towing two trailers. Oversized loads require, at minimum, a permit, and may require one or more pilot vehicles. [40]
W = the maximum weight in pounds that can be carried on a group of two or more axles to the nearest 500 pounds (230 kg). L = spacing in feet between the center of the outer axles of any two or more consecutive axles. N = number of axles being considered.
Each trailer is 28.5 feet (8.7 meters) long and 8.5 feet (2.6 meters) wide. The doubles are connected via a dolly. This long combination vehicle is the only combination of trailers allowed nationwide in the United States. The axle weight allowed is 20,000 pounds (9,100 kg) per single axle.
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.
A typical SPMT has a grid of computer-controlled axles, usually 2 axles across and 4–8 axles along. [4] When two (or more) axles are placed in series, this is called an axle line. All axles are individually controllable, in order to evenly distribute weight and to steer accurately. Each axle can swivel through 270°, with some manufacturers ...
In the United States, a single trailer cannot exceed a length of 57 ft 0 in (17.37 m) on interstate highways (unless a special permit is granted), although it is possible to link two smaller trailers together to a maximum length of 63 ft 0 in (19.20 m). Semi-trailers vary considerably in design, ranging from open-topped grain haulers through ...