How Wide Is a Standard Semi-Truck Trailer?

The standard semi-truck trailer is an essential part of the transportation of goods across the United States. They are typically used for commercial freight and are typically seen on interstates and highways. But just how wide is the average semi-truck trailer?

Semi-truck trailers come in a variety of sizes, but in general, the most common size is 8.5 feet wide. This width includes the side walls and the rear doors, which are generally 96 inches by 96 inches in size. Some trailers also have an additional 2 feet of width to accommodate extra cargo if necessary.

The interior width can vary from trailer to trailer depending on its specific design, but they typically range from 7 to 9 feet. The interior height can also vary based on design, but it is usually between 92 and 107 inches.

The length of a semi-truck trailer can range from 28 to 53 feet in length, depending on its specific design. There are some special trailers that are even longer than that, such as double drop trailers which can be up to 75 feet long.


So to answer the question – how wide is a standard semi-truck trailer? – the answer is 8.5 feet wide including side walls and rear doors. The interior width can range from 7 to 9 feet depending on its design, and lengths range from 28 to 53 feet for standard trailers.

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James Gardner