MOTOR CARRIER DIVISION UTAH DEPARTMENT OF TRANSPORTATION

Chapter 15

Legal Size Vehicle Dimensions

HEIGHT, WIDTH, & LENGTH

The following are the maximum legal vehicle dimensions, loaded or unloaded, that may be operated without special permits on Utah highways:

Height: 14' Measured from level road surface to top of load or vehicle.
Width: 8' 6" With or without load. Measured from outside to outside of widest extremities, excluding appurtenant devices as referenced in UCA 72-7-402(1).
Length: Maximum lengths for various vehicles are as follows:
Vehicle Maximum Length (1) Comments
Single motor vehicle 45' Including front and rear bumpers.
Semi-trailer 48' There is no overall length limitation on a tractor and semi-trailer combination when the semi-trailer length is 48 feet or less.
53' See Oversize Divisible Permit Provisions
Double trailer combinations 61'

Measured from the front of the first trailer to the rear of the second trailer, excluding appurtenances.

There is no overall length limitation on a truck tractor and double trailer combination when the trailers coupled together measure 61 feet or less.

On secondary routes the maximum number of vehicles in combination may not exceed three.
Stinger-steered transporters 75'

Measured from bumper-to-bumper.

May have 3 feet of front and 4 feet of rear overhang.

Permits are not available for excess overhangs or length.

(Re: Federal Size Regulations for Commercial Motor Vehicles-CFR23)- Not to exceed 82 feet maximum overall length. 23 CFR 658.13
Saddle mount 97'

Drive-away with full mount.

Up to triple saddle mount with full mount vehicle transporter combinations allowed. This will allow a maximum of three saddle mount vehicles, one power unit and one full mount.
View code: 23 CFR 658.13(e)(iii)
Truck trailer combination 65'

Measured from bumper-to-bumper.
Dromedary unit 65'

Truck tractor, unloaded box/deck and trailer. A vehicle combination equipped with dromedary capability is only considered a dromedary unit when loaded.

If the dromedary box, plate or deck is not being utilized to transport cargo, the vehicle combination must comply with tractor trailer combination length limits.
75'

Dromedary units transporting Class 1 explosives or munitions-related security materials, as specified by the Department of Defense, are allowed up to 75 feet of overall length on the Interstates, US highways and reasonable access routes without requiring a permit. Reasonable access means any other highway that facilitates access to the Interstate or US highway system.
All other combinations,
including recreational vehicles		 65'

Length limitations do not apply to combinations of vehicles operated at night by a public utility when required for emergency repair of public service facilities or properties, or when operated with an overweight/oversize permit under UCA 72-7-406.

Appurtenances attached to the sides or rear of a recreational vehicle that is not a commercial motor vehicle are excluded for purposes of measuring width and length of the recreational vehicle if the additional width or length of the appurtenances does not exceed 6 inches. UCA 72-7-402(1)(c)
Overhang 3' Front A vehicle or combination of vehicles, as defined in UCA 41-1a-102, may not carry any load 6' Rear extending more than 3 feet beyond the front of the power unit or more than 6 feet beyond the rear of the bed or body of the vehicle.
Drawbar 15'

The drawbar or other connection between any two vehicles, one of which is towing or drawing the other on a highway, may not exceed 15 feet in length from the one vehicle to the other (measured from box to box and/or frame to frame), except in the case of a connection between any two vehicles transporting poles, pipe, machinery, or structural material that cannot be dismembered when transported upon a pole trailer as defined in UCA 41-6a-102 (45).

Note:
When measuring a drawbar length on vehicles that have the coupling device, hitch mounted on the end of the box, bed or frame, do not include the coupling device/hitch in the measurement. An example of this would be a drawbar that when not attached to a tow vehicle, does not exceed 15 feet but when attached to the towing vehicle, the distance from frame to frame or box to frame is greater than 15 feet as a result of the coupling device/hitch.