Commercial motor carriers running in Arizona answer to two sets of rules at once: Arizona Department of Transportation (ADOT) requirements under A.R.S. Title 28, and the federal standards ADOT enforces on top of them. In practice that means the right commercial driver license and endorsements, a current medical card, federal hours-of-service compliance, Clearinghouse participation, vehicles kept inside Arizona’s size and weight limits or moved under permit, and inspection records that an officer can see at a roadside stop. The sections below walk through what each of those actually requires.
The Right CDL Class and Endorsements
A commercial driver license is issued under A.R.S. Title 28, Chapter 8, and the class depends on the vehicle. Class A covers combination vehicles such as tractor-trailers, Class B covers single heavy vehicles like dump trucks and large buses, and Class C covers smaller commercial vehicles used to haul hazardous materials or to carry 16 or more passengers.1Arizona Department of Transportation. Getting Your Commercial Driver License (CDL)
The minimum age is 18, but drivers under 21 are restricted to intrastate work and cannot haul hazardous materials. Interstate driving and hazmat loads both require a driver who is at least 21.
Specialized loads mean specialized endorsements. The “H” endorsement authorizes hazardous materials and requires a TSA background check. The “N” endorsement covers tank vehicles carrying bulk liquids or gases. “T” covers double and triple trailers, “P” covers passenger vehicles, and “S” covers school buses.2Arizona Department of Transportation. CDL Requirements Operating without the correct class or endorsement is a traffic violation, and repeated violations can cost a driver commercial privileges.
Entry-Level Driver Training
Since February 2022, first-time CDL applicants and drivers upgrading from Class B to Class A have to complete entry-level driver training through a provider listed on the FMCSA Training Provider Registry. The same requirement attaches to anyone adding a school bus, passenger, or hazardous materials endorsement for the first time.3Federal Motor Carrier Safety Administration. Entry-Level Driver Training (ELDT) The provider must report completion to the registry before the applicant can take the CDL skills test. Drivers who held the CDL or the relevant endorsement before that date are grandfathered in.
Serious and Major Violation Disqualifications
Arizona follows the federal disqualification schedule. Two serious traffic violations in separate incidents within three years trigger a mandatory disqualification of at least 60 consecutive days. A third within the same three-year window adds at least 120 days. Major offenses — a DUI, a hit and run, or using the vehicle to commit a felony — bring a one-year disqualification for a first offense and lifetime disqualification for a second.4Arizona Legislature. Arizona Code 28-3312 – Mandatory Disqualification of Commercial Driver Licenses; Definition Carriers routinely pull driving records before hiring, so a disqualification is often a career event, not a pause.
Medical Certification
Every commercial driver has to carry a current Medical Examiner’s Certificate, Form MCSA-5876, issued after a physical from a provider on the National Registry of Certified Medical Examiners. The exam covers vision, hearing, blood pressure, and overall fitness to operate a large vehicle for extended periods, and most certificates are good for up to two years. Drivers with conditions such as controlled hypertension may be certified for a shorter period.5Federal Motor Carrier Safety Administration. Medical Examiner’s Certificate (MEC), Form MCSA-5876
After passing the exam, you self-certify your type of operation — interstate or intrastate — with the Arizona Motor Vehicle Division. That links the medical certificate to the driving record so inspectors can verify it electronically. If the certificate lapses or the updated paperwork isn’t filed, MVD downgrades the license to non-commercial status. Getting commercial status back means a new physical and a new self-certification, and the driver is off the road while that runs.
Hours of Service and Electronic Logs
Federal hours-of-service rules apply to commercial drivers in Arizona on both interstate and intrastate work. For property-carrying drivers, the core limits are an 11-hour maximum driving time after 10 consecutive hours off duty, with all driving confined to a 14-hour window that opens the moment any work activity begins.6Federal Motor Carrier Safety Administration. Summary of Hours of Service Regulations Once the 14-hour window closes, no more driving happens until another full off-duty period.
A 30-minute break is required after eight cumulative hours of driving. It can be taken as off-duty time, sleeper berth time, or a combination, as long as no driving happens during it. Sleeper-berth users can split the 10-hour off-duty period into two blocks: one of at least 7 consecutive hours in the sleeper and one of at least 2 hours, adding up to at least 10 hours total. Neither block counts against the 14-hour window.
Duty status has to be recorded on an electronic logging device unless the driver qualifies for a limited exemption. Logs are the first thing a roadside inspector checks, and falsified logs carry out-of-service orders and fines.
Drug and Alcohol Clearinghouse
The FMCSA Drug and Alcohol Clearinghouse is the national database that tracks commercial driver substance-use violations. Employers must query the Clearinghouse before hiring a driver and at least once a year for current employees. A positive drug test, an alcohol test at or above 0.04, or a test refusal is recorded and immediately bars the driver from safety-sensitive duties.
Getting back on the road after a violation is a sequence that usually takes months. The driver sees a DOT-qualified Substance Abuse Professional, who prescribes a treatment or education plan. After completion, the SAP does a follow-up evaluation confirming readiness. Only then can the driver take a directly observed return-to-duty test. Even after returning to work, follow-up testing continues on an unannounced schedule for up to five years. Skipping a step keeps the violation active and keeps the driver out of the seat.
Vehicle Size and Weight Limits
Arizona prohibits operating any vehicle that exceeds the state’s size or weight limits on a highway without authorization, and local governments can’t change those limits unless the statute specifically allows it.7Arizona Legislature. Arizona Code 28-1091 – Violation; Scope and Effect
Size
Width is capped at 102 inches (8 feet 6 inches) on designated highways, not counting safety equipment like mirrors. On other roads the general limit is 8 feet.8Arizona Legislature. Arizona Code 28-1093 – Vehicle Width; Exceptions A single unit, including bumpers and any load, can’t exceed 40 feet in length.9Arizona Legislature. Arizona Code 28-1095 – Vehicle Length; Exceptions; Permits; Rules; Definitions Height is generally limited to 13 feet 6 inches, though you should always verify clearance on your actual route. Anything beyond these dimensions needs a permit.
Weight
The standard gross vehicle weight limit is 80,000 pounds. That weight is distributed: single axles are limited to 20,000 pounds, and tandem axles (centers spaced more than 40 inches but not more than 96 inches apart) are limited to 34,000 pounds.10Federal Highway Administration. Bridge Formula Weights
On top of the flat caps, the Federal Bridge Formula sets the maximum allowable weight for any group of two or more consecutive axles based on how far apart they sit. The practical consequence: a truck can be well under 80,000 pounds gross and still be in violation if too much weight is concentrated on a short axle group. Weigh-station officers check both gross weight and bridge formula compliance, so both have to be verified before the trip.
Vehicle Inspections
Every commercial vehicle has to pass an annual inspection covering brakes, steering, suspension, frame, tires, lighting, and coupling devices. In a combination, the tractor, each trailer, and any converter dolly is inspected individually, and the inspection has to be performed by a qualified inspector with appropriate training or certification.11Federal Motor Carrier Safety Administration. Vehicle Inspection Proof of the most recent inspection must be kept on the vehicle. If you can’t produce it at a roadside stop, the vehicle can be placed out of service.
Beyond the annual, the driver is responsible for a pre-trip and post-trip inspection every day the vehicle operates, with defects noted on a driver vehicle inspection report. Arizona can impose additional state-level inspection requirements on top of the federal baseline, so check with ADOT for current state rules.
Oversize and Overweight Permits
Any load that exceeds the standard size or weight limits needs a permit from ADOT before it moves. The application asks for the vehicle’s registration details, total gross weight, individual axle weights, axle spacing measurements, and the exact loaded dimensions, along with a planned route so ADOT can confirm that every road, bridge, and overpass can handle the load.12Arizona Department of Transportation. Oversize/Overweight Permit Application Axle spacing and axle weights are where applications most often fail, because ADOT uses them to run bridge-formula numbers for the specific route. Measure before you start the application; blank or inconsistent fields send it back and park the load.
Pilot Cars
Loads beyond certain dimensions need escort vehicles. In general, loads wider than 14 feet, taller than 16 feet, or longer than 120 feet require at least one pilot car. On certain state highways, loads over 12 feet wide require both front and rear pilot cars. A front overhang of 20 feet or more requires a front pilot car; a rear overhang of 20 feet or more requires a rear pilot car. When two or more permitted oversize vehicles travel together, each load needs its own escort. ADOT sets the exact requirements on the permit based on route, dimensions, time of transport, and public safety, so read the permit conditions carefully.
Submitting the Application
ADOT processes permits through its EPRO online portal for U.S.-based carriers.13Arizona Department of Transportation. ADOT’s Online Permit Systems Fees vary by permit type and duration, and approval timelines range from a few hours to several business days depending on route complexity. Once approved, the permit is emailed to the applicant. Keep a copy, digital or printed, in the vehicle for the entire move. Enforcement will ask for it, and the load can be stopped until you produce it.