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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]
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.
This exception was sought by the American Trucking Associations so trucking companies could use 40-foot (12.2 m) trailers and weigh 80,000 pounds (36,000 kg). It was the only way tank truck operators could reach 80,000 pounds without adding axles to their fleets of trailers already in operation. [26]
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 ...
Each 797 wheel is attached to the axle using 54 - 36 mm (1.4 in) nuts that are torqued to 2,300 lb⋅ft (3,118 N⋅m). [15] A size 55/80R63 radial tire was developed by Michelin in conjunction with Caterpillar specifically for the first generation 797. [16]
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 ...