It is illegal to move any vehicle which exceeds the legal size and weight limits on any highway except with a special permit. This chapter describes some of those limits. Remember: no local authority has the power to alter these limitations.

Width

No vehicle shall have a total outside width, including load, of more than 8-1/2 feet. One exception to this rule is farm tractors. Their width may not exceed 9 feet. In addition, farm machinery may move short distances upon the highway, regardless of their size, if they are actually engaged in farm operations.

Height

No vehicle shall exceed a height of 14 feet, including any load that may be carried.

Road sign indicating upcoming weigh station, on I-70: Wasted Time R at en.wikipedia, CC-BY-SA-3.0, from Wikimedia Commons

Length

No single vehicle, except for fire-fighting equipment, shall exceed an overall length of 45 feet, including the front and rear bumpers. A truck tractor coupled to a semi-trailer or trailers is considered to be two vehicles.

NOTE: All other combinations of vehicles, with or without a load, (such as a motor home pulling a boat) may not exceed a total length of 65 feet.

Loads Projecting to the Front and Rear

No train of vehicles or single vehicle shall carry a load extending more than three feet to the front, nor more than six feet to the rear of the body of the vehicle. Requirements for placement of flags, if required, are listed later in this chapter.

Loads Projecting to the Sides

No vehicle, including a passenger vehicle, may carry any load extending beyond the line of the fenders on the left side of the vehicle nor extending more than six inches beyond the line of the fenders on the right side of the vehicle. Requirements for lighting and flagging loads that project beyond the sides or ends of a vehicle are discussed later in this chapter.

Posting of Registered Gross Laden Weight

The Utah State Tax Commission requires that every vehicle registered for 16,001 pounds or more have the weight for which it is registered displayed upon both the left and right sides of the vehicle. This can be done with paint, stencil, or decals. The information must be in letters not less than two inches high and placed in a location that is easily seen.

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