What Is the Legal Length for a Semi Truck and Trailer?

The legal length for a semi truck and trailer is set by the state in which the vehicle is being operated. In most locations, the total length of a truck and trailer combination, including any load that is being carried, must not exceed 80 feet. However, this varies from state to state and in some instances can be as high as 95 feet.

In general, semi trucks are limited to two trailers at once, but again this can vary across states. Where two trailers are allowed, the total length of the combination cannot exceed 97 feet.

One trailer must be no more than 53 feet, while the second must be no more than 43 feet. If a driver needs to transport a load exceeding this limit they must obtain an oversized permit from their local highway authorities.

In addition to these size restrictions, there are also limitations on how much weight a semi truck and trailer can carry. The maximum weight for most semi trucks and trailers is around 80,000 pounds. However again this varies from state to state with some states allowing loads of up to 100,000 pounds.

It is important for drivers of semi trucks to ensure they comply with all legal requirements when it comes to size and weight limits. Failing to do so can result in hefty fines or even criminal charges in some cases. Drivers should always check the laws of their local jurisdiction before transporting any loads that exceed legal limits.


The legal length for a semi truck and trailer depends on the individual laws set by each state which can range from 80-95 feet for single trailers or 97 feet when transporting two trailers at once. Maximum weight limits also apply with most states setting it at 80,000 pounds although some areas allow for up to 100,000 pounds.

It is essential that drivers always check local regulations before operating their vehicles as failure to do so could lead to serious consequences.

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Susan Delgado