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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]
For a 3-axle truck with an axle length of 14 feet (4.3 m), the weight limit increased from 46,500 pounds (21,100 kg) to 54,000 pounds (24,000 kg). [29] TTI HS-20 also failed to address the problem of multiple-span bridges.
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.
In the EU a tractor can generally have 10 tonnes (22,000 lb) on a single axle, with suspension type and number of tires often allowing slightly higher loads. In the U.S. weight restrictions are generally 20,000 pounds (9,100 kg) on a single axle, and 34,000 pounds (15,000 kg) (less than two single axles) on a tandem.
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 ...