1. (1) Maximum legal vehicle dimensions, laden and un-laden, that may be operated without special permits on Utah highways:

   1. (a) height: 14 feet;
   2. (b) width: eight feet six inches; and

   3. (c) length: See Table 1 Legal Size Vehicle Dimensions.

      TABLE 1Legal Size Vehicle DimensionsVehicleMaximum LengthCommentsTruck tractor45'Measured from bumper to bumper.Straight truck45'Measured from bumper to bumper.Semitrailer53'Measured from bumper to bumper.Full trailer53'Measured from bumper to bumper.Truck, tractor, and double trailer61'Measured from the front of the first trailer to the rear of the second trailer. Tractor is not included in the measurement.Truck, tractor, and triple trailer61'Measured from the front of the first trailer to the rear of the third trailer. Tractor is not included in the measurement.Truck and single trailer65'Measured from bumper to bumper.Truck and two trailers65'Measured from bumper to bumper.Non-commercial RV65'Measured from bumper to bumper.Stringer steered80'Measured from bumper to bumper.Dromedary plus trailer65' *Measured from bumper to bumper. A dromedary unit is considered a truck trailer configuration whether laden or unladen.

      Saddle mount97'Measured from furthest extremities to the front and rear. Maximum of one power unit, three saddle mount vehicles, and one full mount.Drawbar15' **Measured from box to box or frame to frame.Front overhang3' ***Measured from the front of the power unit.Rear overhang6'Measured from the rear of the bed or body of the vehicle.* The maximum length is 75' when a dromedary plus trailer is hauling Class 1 munitions on interstates, US highways, and reasonable access routes.** The 15' maximum length does not apply in the case of a connection between two vehicles transporting poles, pipe, machinery, or structural material that cannot be dismembered when transported upon a pole trailer.*** The maximum length is 4' when a stinger steer is in use.

KEY: permits, safety regulations, size and weight, trucks

Date of Last Change: March 16, 2026

Notice of Continuation: April 30, 2024

Authorizing, and Implemented or Interpreted Law: 72-1-201; 72-7-406; 72-9-303; 41-1a-102; 41-1a-231; 41-1a-1206; 72-7-402; 72-7-404; 72-7-407; 72-9-301; 72-9-502