Oversize and Overweight Vehicle Permits in Utah

Operating oversize or overweight (OSOW) loads in Utah requires strict adherence to regulations managed by the Utah Department of Transportation (UDOT) Motor Carrier Division. Under Utah Administrative Code R909-2, any vehicle exceeding 8 feet 6 inches in width, 14 feet in height, or 65 feet in length for a single unit (75 feet for a tractor-trailer combination) must obtain a permit before entering the state. Utah is a critical corridor for Western regional freight, and its mountainous terrain necessitates specific axle weight distributions and brake requirements to ensure safety on steep grades like Parley's Canyon or I-15 through the Virgin River Gorge. DispatchTool assists carriers in managing these complex requirements by centralizing route documentation and permit storage for every load. When planning a move across Utah, dispatchers can use the platform to share specific permit instructions and restricted route maps directly with drivers, ensuring compliance with UDOT-mandated curfews and bridge restrictions. To streamline your heavy haul operations and maintain organized records for IFTA and state audits, create a DispatchTool account.

Standard Legal Dimensions and Weight Limits

In Utah, legal dimensions are defined as a maximum width of 8 feet 6 inches, a maximum height of 14 feet, and a maximum overall length of 65 feet for a single motor vehicle. For a tractor and semi-trailer combination, the legal length is 53 feet for the trailer, with no overall length limit on designated National Network highways, provided the wheelbase meets federal standards. Legal weight limits follow the Federal Bridge Formula, capping gross vehicle weight (GVW) at 80,000 pounds. Single axles are limited to 20,000 pounds, while tandem axles are restricted to 34,000 pounds. Any vehicle exceeding these thresholds requires a UDOT-issued permit, which can be obtained as a single-trip, multi-trip, or annual authorization depending on the load characteristics.

Utah Permit Fees and Application Process

Permit costs in Utah vary based on the duration and the extent of the weight or size violation. According to the UDOT Motor Carrier Division, a single-trip oversize permit typically costs $30 for a 96-hour period. Overweight permits are calculated based on the total GVW: loads up to 125,000 pounds cost $60, while loads exceeding 125,000 pounds cost $120. For carriers frequenting the state, annual permits are available, starting at $75 for oversize-only loads and scaling up to $900 for overweight loads up to 125,000 pounds. Applications are processed through the Utah TransIT system, and carriers must have a valid USDOT number and proof of insurance on file, typically requiring a $750,000 minimum for general freight and up to $5 million for hazardous materials.

Pilot Car and Escort Vehicle Requirements

Escort requirements in Utah are triggered by the specific dimensions of the load and the type of highway being traveled. For loads exceeding 12 feet in width on secondary roads or 14 feet on interstates, at least one pilot car is required. If a load exceeds 16 feet in width or 17 feet 6 inches in height, two escorts (front and rear) are mandatory. Utah law requires all pilot car drivers to be certified through a UDOT-approved program or a state with a reciprocal agreement. Escort vehicles must be equipped with a two-way radio, an 'Oversize Load' sign measuring at least 5 feet by 12 inches, and amber flashing lights visible from 360 degrees. Rear escorts must also carry a height pole if the load exceeds 16 feet to prevent bridge strikes.

Restricted Travel Hours and Curfews

Utah imposes strict travel curfews for OSOW loads in its major metropolitan areas to mitigate traffic congestion. In Salt Lake, Davis, and Weber counties, travel is prohibited Monday through Friday from 6:00 AM to 9:00 AM and from 3:30 PM to 6:00 PM for loads exceeding 10 feet wide, 105 feet long, or 14 feet 6 inches high. Additionally, movement is restricted on major holidays including New Year's Day, Memorial Day, Independence Day, Labor Day, Thanksgiving, and Christmas. During inclement weather, such as snow or ice where visibility is less than 500 feet or road surfaces are hazardous, all OSOW movement must cease immediately as per Utah Administrative Code R909-2-10.

Bridge Formula and Axle Spacing Rules

Utah utilizes the Bridge Table to determine maximum allowable weights for overweight permits. The state allows a maximum of 20,000 pounds on a single axle and 34,000 pounds on a tandem axle under legal limits, but permitted loads can go higher if axle spacing is sufficient. For instance, a tridem axle group may be permitted for up to 42,000 to 54,000 pounds depending on the distance between the first and last axle of the group. If a load exceeds 125,000 pounds, UDOT requires a specialized bridge analysis to ensure the infrastructure can support the concentrated weight. This analysis can take up to 10 business days and may require a certified engineering review if the load is exceptionally heavy or traveling over older spans.

Signing and Lighting Standards

Vehicles operating under an oversize permit must display 'OVERSIZE LOAD' signs on both the front and rear of the vehicle. These signs must be at least 7 feet wide by 18 inches high with black lettering on a yellow background. Additionally, red or fluorescent orange flags, at least 18 inches square, must be placed at the widest extremities of the load. During nighttime hours, which Utah defines as a half-hour after sunset to a half-hour before sunrise, the load must be marked with amber lights on the front and sides and red lights on the rear. Failure to properly mark a load can result in fines starting at $150 and an immediate out-of-service order until the vehicle is compliant.

Sources

Utah Department of Transportation Motor Carrier Division (2024) — https://www.udot.utah.gov/connect/business/motor-carriers/ Utah Administrative Code R909-2 (2024) — https://rules.utah.gov/publicat/code/r909/r909-002.htm Federal Highway Administration - Bridge Formula Weights (2023) — https://ops.fhwa.dot.gov/freight/publications/brdg_frm_wghts/

Frequently asked

What is the maximum height allowed in Utah without a permit?

The maximum legal height in Utah is 14 feet. Any load exceeding this height requires a permit from UDOT and may require a route survey to ensure clearance of overpasses and utility lines.

Do I need a permit for a wide load in Utah if it is exactly 8'6"?

No, a width of 8 feet 6 inches is considered the legal limit in Utah. You only need an oversize permit if your load exceeds 8 feet 6 inches in width.

How long is a Utah single-trip permit valid for?

A single-trip permit issued by the Utah Department of Transportation is valid for 96 hours (4 days) from the effective date and time specified on the permit.

Are there specific routes restricted for heavy loads in Utah?

Yes, UDOT maintains a restricted bridge list and specific route limitations for loads exceeding 125,000 pounds or those with extreme widths. These restrictions are frequently updated in the Utah TransIT system.