What Are the 18-Wheeler Trailer’s Typical Dimensions?

The maximum width for commercial motor vehicles, according to the U.S. Department of Transportation, is 102.36 inches, with a length that can range from 48 to 53 feet and a height of 13 to 14 feet. The individual states determine the maximum heights at which trailers can drive; the federal government is not subject to any such restrictions.

Although state-level length restrictions are left up to state discretion under federal laws, the Department of Transportation claims there are minimum dimensions that all states must permit for trailers.

A semi-trailer must be at least 48 feet long. A double trailer must be at least 28 feet long on each side. When the cab is added, there is no upper limit on overall length. States are permitted to impose restrictions on trailers that cross low overpasses.

Federal width standards do not apply to specialised devices like rearview mirrors. In general, semi-trailers are limited to 80,000 pounds on highways due to the risk of bridge collapse from excessive weight.

On highways, specialised vehicles must adhere to minimal lengths. The minimum length for traditional auto and boat transfers is 65 feet. Transports of beverage trailers must be 28 feet long.

Federal law mandates a minimum length of 75 feet for saddlemount vehicles. Weight criteria were established in 1991, while standards for linear measurements were established in 1982.


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