Arizona's motor carrier safety rules are adopted by ADOT and enforced by the Arizona Department of Public Safety, the state's designated MCSAP lead agency (A.R.S. 28-5204). The adopted federal parts apply to intrastate and interstate carriers operating in Arizona, with Arizona amendments. For intrastate commerce, a commercial motor vehicle starts at 26,001 pounds GVWR or gross weight (buses, for-hire passenger vehicles for 9 or more, and placarded hazmat at any weight); for interstate commerce Arizona uses the federal 10,001 pounds (A.R.S. 28-5201). Arizona Administrative Code R17-5-206(B) requires an active USDOT number for every commercial motor vehicle operating in intrastate commerce. Arizona has no general longer-hours rule for intrastate drivers; its main hours exception is a 24-hour restart for specific intrastate drivers. And Arizona enforcement leans hard on logs: 26.7% of driver inspections in Arizona recorded an HOS violation, against 7.8% nationally.
Who this guide is for
This guide is for Arizona-based carriers and for carriers that cross Arizona on the I-10 and I-40 corridors. Arizona is home to 9,071 interstate carriers in FMCSA's census, 87.4% of them running 10 or fewer power units, plus 20,965 intrastate carriers listed in the same file. Phoenix-area carriers can also see our Phoenix metro page.
Arizona enforcement and USDOT registration
ADOT adopts Arizona's motor carrier safety rules and DPS must enforce them; political subdivisions may also enforce them if DPS certifies their officers (A.R.S. 28-5204). DPS is the designated MCSAP lead agency and runs commercial vehicle enforcement.
Arizona Administrative Code R17-5-206(B) requires an active USDOT number for every commercial motor vehicle operating in intrastate commerce in Arizona; DPS dates the intrastate USDOT requirement to July 10, 2007.
Why Arizona inspections find so many HOS violations
Arizona's inspection data stands out. Driver inspections in Arizona recorded at least one hours-of-service violation 26.7% of the time, more than three times the national 7.8%. The driver out-of-service rate was 13.8% (national 6.2%), and 73.6% of vehicle inspections recorded a maintenance violation (national 48.9%).
| Roadside inspections, September 25, 2024 to September 24, 2026 | Arizona | 50 states and DC |
|---|---|---|
| Inspections reported by the state (all carriers) | 107,599 | 5,653,653 |
| Driver out-of-service rate | 13.8% | 6.2% |
| Vehicle out-of-service rate | 26.3% | 22.5% |
| Driver inspections with at least one HOS violation | 26.7% | 7.8% |
| Vehicle inspections with at least one maintenance violation | 73.6% | 48.9% |
Context matters here: 78.7% of the inspections Arizona reported in this window involved carriers based in another state, and 21.3% involved Arizona-based carriers. Most of what Arizona inspectors see involves carriers based elsewhere, so these rates describe the trucks crossing Arizona more than Arizona's own fleets. Arizona-based interstate carriers, wherever inspected, had a driver out-of-service rate of 4.5%, below the national figure, and a vehicle out-of-service rate of 21.7%.
Which violations Arizona inspectors record
| Most frequent violation groups at Arizona inspections | Violations | Share of all violations recorded |
|---|---|---|
| Brakes, other than adjustment (FMCSA: Brakes All Others) | 36,623 | 14.4% |
| Windshield, glass and markings (FMCSA: Windshield/ Glass/ Markings) | 26,246 | 10.3% |
| Lighting | 22,073 | 8.7% |
| Reflective Sheeting | 18,912 | 7.4% |
| Clearance and identification lamps (FMCSA: Clearance Identification Lamps/Other) | 14,525 | 5.7% |
Source: Fleet Regulators analysis of FMCSA Safety Measurement System (SMS) input files, monthly run published October 2026, covering roadside inspections recorded September 25, 2024 to September 24, 2026. "In the state" means the inspection was reported by Arizona, whatever the carrier's home state. Driver rates use Level 1, 2, 3 and 6 inspections; vehicle rates use Level 1, 2, 5 and 6. Group names are FMCSA's. Same method as our HOS roadside violations study.
These figures describe what inspectors recorded, not how safe carriers in the state are. Rates move with enforcement priorities, which inspection levels a state favors, where it inspects, and which carriers pass through. For any carrier routing trucks through Arizona, the lesson is still direct: logs need to be clean before the truck reaches the state line, because that is where they are most likely to be read closely. Our HOS roadside violations study shows which HOS codes inspectors cite most nationally, and our ELD mistakes guide covers the form-and-manner errors that turn into violations.
Arizona intrastate rules vs federal rules
| Topic | Federal (interstate) | Arizona intrastate |
|---|---|---|
| Weight where the rules start | 10,001 lb | 26,001 lb GVWR or gross weight; buses, for-hire passenger vehicles for 9+ and placarded hazmat at any weight |
| Hours of service | 11 / 14 / 60-70 hours | Federal limits; a 24-hour restart for groundwater drilling rig haulers, construction haulers to active sites within 75 air miles, and public utility service vehicle drivers (not placarded hazmat) |
| Minimum driver age | 21 | 18 for intrastate-only operation, not for hazmat above listed thresholds (R17-5-204) |
| Medical qualification | 49 CFR 391.41 | An Arizona intrastate medical waiver granted by the ADOT Director is accepted in the DQ file (R17-5-204) |
| Registration | USDOT for interstate CMVs | Every intrastate CMV needs an active USDOT number (R17-5-206); intrastate carriers file an MCS-150 (R17-5-203) |
Arizona also exempts telecommunications public utilities and railroads from 49 CFR Parts 391 and 395 for employees whose driving of vehicles over 18,000 pounds is only incidental to their non-driving duties (A.R.S. 28-5234), with some Part 391 provisions still applying. As a state law, that exemption cannot reach interstate operations.
Arizona compliance checklist
- Classify vehicles: 26,001 lb and up (intrastate CMV), 10,001 lb and up in interstate commerce, buses, for-hire passenger vehicles and placarded hazmat.
- Get an active USDOT number for every intrastate CMV, and file the MCS-150.
- Audit logs daily, with extra attention to trucks routed through Arizona ports of entry.
- Use the 24-hour restart only for the listed intrastate driver groups.
- Keep intrastate-only drivers aged 18 to 20, and drivers with ADOT medical waivers, off interstate and hazmat loads.
- Maintain driver qualification files (see the DQ file checklist) with any waiver documented.
- Check brakes, windshields, lighting and reflective sheeting on pre-trips.
How Fleet Regulators supports Arizona carriers
We support Arizona carriers remotely from Austin, Texas; we have no Arizona office. Given what Arizona inspections record, daily HOS log auditing is the natural place to start: catching form-and-manner errors, unassigned driving time and hours violations before a truck reaches an inspection. We also build driver qualification files, tighten maintenance records, and prepare carriers for audits. For ongoing coverage, see our fractional safety department.
Get Proactive Safety and Compliance Support in Arizona
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Talk to Fleet Regulators →Frequently Asked Questions
The Arizona Department of Public Safety, the state's designated MCSAP lead agency, enforces the motor carrier safety rules that ADOT adopts. Local agencies may enforce them if DPS certifies their officers.
For intrastate commerce, a commercial motor vehicle is 26,001 pounds GVWR or gross weight, plus buses, for-hire passenger vehicles designed for 9 or more and placarded hazmat vehicles at any weight (A.R.S. 28-5201). Interstate commerce uses 10,001 pounds.
Yes. Arizona Administrative Code R17-5-206(B) requires an active USDOT number for every commercial motor vehicle operating in intrastate commerce in Arizona. DPS dates the intrastate USDOT requirement to July 10, 2007.
Not generally. A.R.S. 28-5234 lets certain intrastate drivers, such as construction haulers to active sites within 75 air miles, restart their hours after 24 or more consecutive hours off duty.
In FMCSA SMS data for September 2024 to September 2026, 26.7 percent of Arizona driver inspections recorded an HOS violation. About 79 percent of Arizona inspections involve carriers based in other states, so the rate describes the trucks crossing Arizona more than Arizona fleets alone.
- Commercial Vehicle Enforcement ↗
- A.R.S. 28-5201, Definitions ↗
- A.R.S. 28-5204, Rules; enforcement ↗
- A.R.S. 28-5234, Exemptions; hours of service ↗
- Ariz. Admin. Code R17-5-202, Federal regulations incorporated ↗
- Ariz. Admin. Code R17-5-203, Motor carrier registration ↗
- Ariz. Admin. Code R17-5-204, Driver qualifications ↗
- Ariz. Admin. Code R17-5-206, USDOT number ↗
- SMS Input - Inspection (dataset rbkj-cgst) ↗
- SMS Input - Violation (dataset 8mt8-2mdr) ↗
- SMS Input - Motor Carrier Census Information (dataset kjg3-diqy) ↗
Last updated November 2026. Prepared by Fleet Regulators from the sources listed above. This page explains regulations in plain English and is not legal advice. Rules change; confirm current requirements with the agency named in each source before acting.
