Oversize and Overweight Permitting in Arizona

Operating oversize or overweight (OS/OW) loads in Arizona requires strict adherence to the regulations set by the Arizona Department of Transportation (ADOT). Under Arizona Revised Statutes Title 28, Chapter 3, Article 18, any vehicle or load exceeding legal dimensions must obtain a permit before traveling on state highways. Legal dimensions in Arizona are capped at 8 feet 6 inches in width, 13 feet 6 inches in height, and a gross vehicle weight of 80,000 pounds. For length, a single vehicle is limited to 45 feet, while a truck-tractor and semi-trailer combination generally allows for a 53-foot trailer on designated routes. Failing to secure a permit or violating its terms can result in significant fines and the immediate grounding of equipment. DispatchTool streamlines this process by providing truck-safe routing that accounts for Arizona’s specific height restrictions and bridge weight limits, ensuring drivers avoid restricted corridors like the I-10 tunnels in Phoenix. By integrating permit data into the dispatch workflow, fleet managers can verify that all documentation is in order before the wheels turn. Create a DispatchTool account to manage your permits and route your OS/OW loads through Arizona with precision.

Standard Permit Fees and Types

Arizona offers several permit types based on the frequency and nature of the transport. A single-trip permit for an oversize load is $15.00, while a single-trip overweight permit costs $75.00. For carriers frequently moving loads, the Class C annual permit for oversize vehicles is $750.00, and the Class C annual overweight permit is $1,500.00. These permits are valid for 30 days or a full year depending on the selection. ADOT also issues 30-day permits for $30.00 (oversize) and $75.00 (overweight). Fees are non-refundable and must be paid at the time of application via the ADOT e-Permit system.

Maximum Legal Dimensions and Weight Limits

Before a permit is required, a load must exceed Arizona’s legal limits. The maximum width is 8 feet 6 inches. The maximum height is 13 feet 6 inches, which is strictly enforced due to numerous low-clearance bridges on secondary routes. The maximum overall length for a tractor-trailer combination is not specifically limited by statute on the National Network, but the trailer itself cannot exceed 53 feet. Weight is limited by the Federal Bridge Formula, with a maximum gross vehicle weight of 80,000 pounds. Single axles are limited to 20,000 pounds, and tandem axles are limited to 34,000 pounds.

Escort Vehicle Requirements

Escort vehicles, or pilot cars, are mandatory when a load exceeds specific thresholds. For widths over 12 feet up to 14 feet, one escort is generally required on two-lane highways. Loads exceeding 14 feet in width typically require two escorts (front and rear) on all highways. If a load is over 16 feet wide, ADOT may require a law enforcement escort. For length, one escort is needed if the overall length exceeds 100 feet or if the rear overhang exceeds 20 feet. Height escorts with high-poles are required for any load exceeding 16 feet to ensure clearance of overhead lines and structures.

Time of Travel and Holiday Restrictions

In Arizona, oversize loads are generally permitted to travel from sunrise to sunset. However, loads that are overweight only and do not exceed legal dimensions may travel 24/7. Continuous travel is also granted for loads up to 10 feet wide. Movement is strictly prohibited on major holidays, including New Year’s Day, Memorial Day, Independence Day, Labor Day, Thanksgiving, and Christmas. In metropolitan areas like Phoenix and Tucson, additional rush-hour curfews apply, typically Monday through Friday from 6:00 AM to 9:00 AM and 4:00 PM to 6:00 PM.

Safety Equipment and Signage

Vehicles operating under an OS/OW permit must display 'OVERSIZE LOAD' signs on both the front and rear. These signs must be at least 7 feet wide and 18 inches high, with black letters 10 inches tall on a yellow background. Warning flags are required at all four corners of the extremities of the load; flags must be bright red or fluorescent orange and at least 18 inches square. If traveling during permitted nighttime hours (for specific loads), amber warning lights must be visible from 360 degrees and meet SAE Class 1 or 2 standards.

Bridge and Route Restrictions

Arizona maintains a detailed list of restricted bridges and routes that cannot support specific weights. The I-10 Deck Park Tunnel in Phoenix has a strict height limit of 14 feet 6 inches for the outside lanes, but permits often reroute taller loads to I-17 or Loop 101. The Hoover Dam Bypass (US 93) has specific security and weight protocols. Drivers must follow the route printed on the permit exactly; any deviation constitutes driving without a permit. Use of the ADOT 'Restricted Routes' map is mandatory during the planning phase to avoid 10% to 20% fines based on the degree of violation.

Superload Criteria in Arizona

A 'Superload' in Arizona is defined as any load exceeding 250,000 pounds in gross weight, 16 feet in width, or 16 feet in height. These applications require a minimum of 10 to 15 business days for review by ADOT engineers. The application must include a detailed axle spacing diagram and may require a bridge structural analysis paid for by the carrier. Fees for superloads are calculated based on a $75.00 base plus additional ton-mile charges if the weight exceeds the standard overweight chart limits.

Sources

Arizona Department of Transportation (ADOT) - Enforcement and Compliance (2024) — https://azdot.gov/motor-vehicles/enforcement/oversize-overweight-permits Arizona Revised Statutes Title 28 (2024) — https://www.azleg.gov/ars-title-28/ American Transportation Research Institute (ATRI) - Arizona State Rules (2023) — https://truckingresearch.org/

Frequently asked

What is the maximum weight I can carry with a standard permit in Arizona?

With a standard overweight permit, you can typically reach up to 132,000 pounds on a 7-axle configuration, provided the axle spacings meet the Bridge Formula requirements. Weights exceeding 250,000 pounds are classified as Superloads.

How much does an Arizona oversize permit cost?

A single-trip oversize permit costs $15.00, while a single-trip overweight permit is $75.00. Annual permits range from $750.00 to $1,500.00 depending on the load classification.

Are flags required for over-length loads in Arizona?

Yes, red or orange flags at least 18 inches square must be placed on the four corners of any load that exceeds 8 feet 6 inches in width or has a rear overhang exceeding 4 feet.

Can I travel at night with an oversize load in Arizona?

Night travel is generally prohibited for loads exceeding 10 feet in width. Loads that are only overweight but within legal dimensions are allowed 24-hour travel, provided it is stated on the permit.

What are the curfew times for Phoenix and Tucson?

Oversize loads are prohibited from moving in the Phoenix and Tucson metro areas between 6:00 AM to 9:00 AM and 4:00 PM to 6:00 PM, Monday through Friday.