ePRO applications
ADOT directs commercial vehicle permit applications through ePRO. Select the permit class from the complete loaded configuration and proposed route.
Arizona Heavy Haul Permit Rules
Arizona Oversize and Overweight Permits: Legal Limits, Permit Rules and Route Planning
When is a Arizona oversize or overweight permit required?
Arizona requires an ADOT oversize or overweight permit for qualifying nonreducible vehicle-and-load combinations exceeding applicable legal limits on state routes, Interstate routes or U.S. highways. Class C review applies above 250,000 pounds, 14 feet wide, 16 feet high or 120 feet long. Local-road authority must be evaluated separately.
Arizona Legal Limits and Permit Decision Points
Legal limits, routine permit envelopes and superload thresholds are different concepts. Use the complete loaded configuration, axle data, proposed route and current restrictions instead of treating one number as universal authorization.
| Parameter | Legal reference | Permit decision | Escalation | Official basis |
|---|---|---|---|---|
| Legal width | 8 ft 6 in under the applicable Arizona commercial-vehicle width rule, subject to statutory exceptions | A qualifying nonreducible load exceeding legal width requires the applicable ADOT permit. | More than 14 ft wide requires the Class C permit path. | A.R.S. §28-1093 and ADOT General Permit Information |
| Envelope permit | Not a no-permit limit | Up to 250,000 lb gross, 14 ft wide, 16 ft high and 120 ft overall, with at least four axles unless ADOT approves otherwise | Exceeding an envelope dimension or weight requires Class C review. | ADOT General Permit Information |
| Class C threshold | Not a no-permit limit | Required above 250,000 lb, 14 ft width, 16 ft height or 120 ft length | Class C movements require project-specific review and conditions. | ADOT General Permit Information |
| Road scope | Legal limits depend on configuration and Arizona law | ADOT states its OS/OW permits are issued for state routes, Interstate routes and U.S. highways. | County and city ordinances or permits must be resolved for locally controlled roads. | ADOT Commercial Vehicle Permits |
Arizona Permit Operations and Jurisdiction Responsibilities
Class C review
Loads above the published envelope thresholds follow the Class C process rather than being described as routine envelope movements.
Holiday and statewide restrictions
ADOT publishes holiday travel restrictions, bridge-weight information and statewide restriction notices. Review them for the actual travel date.
Local jurisdictions
Arizona maintains county and city ordinance information. ADOT state-route authorization should not be represented as blanket permission for every local street.
Arizona Department of Transportation Enforcement and Compliance
Permit system: ADOT ePRO | Phone: 602-771-2960
Arizona Municipal Permit and Access Guides
Start with the state guide, then identify municipal, county, bridge, toll, port, terminal and facility authority for the actual first- and final-mile route.
Arizona Heavy Haul Permit FAQs
When does Arizona require a Class C oversize or overweight permit?
ADOT states that Class C permits are required when a load exceeds 250,000 pounds gross, 14 feet in width, 16 feet in height or 120 feet in overall length.
What is an Arizona envelope permit?
ADOT describes an envelope permit for a nonspecific, nonreducible vehicle or cargo load up to 250,000 pounds gross, 14 feet wide, 16 feet high and 120 feet long, normally with at least four axles.
Does an ADOT permit automatically cover Arizona city streets?
No blanket local coverage should be assumed. ADOT publishes local county and city ordinance information, and the responsible local authority may control locally owned roads.
Where are Arizona commercial vehicle permits ordered?
ADOT provides online commercial vehicle permitting through ePRO. Applicants must use the actual vehicle, cargo, axle and route information to select the correct permit.
Official Arizona sources and review status
Reviewed 2026-08-04. Recheck the issued permit, current notices, bridge postings, weather, route restrictions and local permissions before movement.
Review the Arizona load and route before ordering
Share the complete configuration, axle data, addresses, requested dates and proposed route so every jurisdiction and restriction can be identified.