Arizona Trucking Regulations

Arizona is a major freight crossroads between the Pacific Coast, Rocky Mountain states, and the Midwest. I-10 and I-40 carry some of the highest commercial vehicle volumes in the Southwest, connecting Los Angeles to El Paso and Albuquerque respectively. The Phoenix metropolitan area is the primary distribution hub, while Tucson serves as a secondary logistics center and gateway to Mexico via the Nogales port of entry. Arizona's ADOT Motor Vehicle Division administers IRP and IFTA for the state. A distinctive feature of Arizona trucking is the network of ports of entry where all commercial vehicles must stop for weight and credential checks. Mountain grades on I-17 and US-60 require attention to brake check areas and posted requirements. Arizona's extreme summer heat also creates tire inspection and load securing considerations for carriers.

Trucking authority and registration

  • Authority: Arizona Department of Transportation (ADOT) — Motor Vehicle Division
  • IRP jurisdiction: Yes (https://azdot.gov/motor-vehicle/commercial-services/international-registration-plan-irp)
  • IFTA jurisdiction: Yes (https://azdot.gov/motor-vehicle/commercial-services/international-fuel-tax-agreement-ifta)
  • DOT permit required: Yes — Intrastate Arizona carriers must register with ADOT and obtain an Arizona DOT number. Interstate carriers operating with a USDOT number must comply with Arizona port-of-entry requirements.

Weight limits

GVWR80,000 lbs federal interstate standard
Single axle20,000 lbs
Tandem axle34,000 lbs

Arizona allows higher gross weights on certain state routes under permit. Five-axle combinations may reach up to 96,000 lbs on non-Interstate routes with ADOT overweight permit.

Notable regulations

  • All commercial vehicles must stop at all open Arizona ports of entry (weigh stations) for weight and credential inspection — bypassing an open port of entry is a violation.
  • Brake check areas are posted and enforced on steep mountain grades including I-17 southbound near Black Canyon City and US-60 descending into the Salt River Canyon.
  • Arizona requires a Motor Carrier Safety Permit for intrastate carriers operating vehicles over 26,000 lbs GVWR or transporting hazardous materials.
  • Oversize/overweight loads require an ADOT permit; movements of certain dimensions are restricted to daylight hours and may require escort vehicles.
  • Commercial vehicles operating on US-60 and SR-89 through mountain areas face seasonal restrictions during winter storm events; ADOT's AZ511 system provides real-time road conditions.

State trucking association: Arizona Trucking Association

Frequently asked questions

Are commercial vehicles required to stop at all Arizona weigh stations?

Yes. Arizona law requires all commercial vehicles to stop at every open port of entry. PrePass or Weigh2Go transponders may allow eligible vehicles to bypass without stopping, but only when an electronic clearance is granted. Bypassing an open port without clearance is a moving violation.

What are the brake check requirements on Arizona mountain grades?

ADOT posts brake check areas on steep descents including I-17 southbound and US-60 descending into Globe. Drivers are required to inspect brakes and adjust speed before descending. Commercial vehicle brake check compliance is enforced by ADOT Motor Vehicle Enforcement.

How do I get an oversize/overweight permit in Arizona?

Oversize and overweight permits are issued by ADOT. Single-trip, multi-trip, and annual blanket permits are available. Applications can be submitted online through the ADOT Permit Office. Certain extra-wide or super-heavy loads require route surveys and law enforcement escort.

What is the process for Mexico-bound freight through Arizona?

Carriers transporting goods to or from Mexico through Arizona's ports of entry (Nogales, Douglas, Lukeville) must comply with both U.S. CBP requirements and Mexican commercial vehicle regulations. C-TPAT certification and prior notification may be required depending on cargo type.

Sources

Verified 2026-05-26.