Arizona CDL General Knowledge Practice Test

The Arizona CDL test has 50 questions. You need at least 40 correct — 80% — to pass. CDL knowledge tests are available at Arizona MVD offices and Authorized Third Party (ATP) locations.

Arizona CDL holders in a commercial motor vehicle face a 0.04% BAC limit — half the standard DUI threshold. This is the FMCSA federal minimum. Arizona's Extreme DUI (0.15%) and Super Extreme DUI (0.20%) tiers don't change the CDL threshold — CDL holders in a CMV face disqualification at 0.04% regardless of which DUI tier would apply. A DUI in any vehicle triggers CDL disqualification.

Arizona's Authorized Third Party (ATP) program allows private businesses to administer CDL knowledge tests and skills tests. ATP locations can offer faster appointment availability than MVD offices. CDL skills tests at ATP sites follow the same FMCSA standards. Use servicearizona.com to find ATP locations offering CDL testing services.

An Arizona CDL is valid for 4 years. Your DOT medical certificate must remain current. HazMat endorsement requires TSA security clearance renewal every 5 years. Arizona CDL holders must self-certify their medical status category annually at the MVD.

Arizona-specific CDL hazards: (1) extreme heat affecting tire pressure, brake fade risk, and cargo temperature; (2) flash flooding in desert washes — never drive into flowing water; (3) dust storms (haboobs) — if caught in a haboob, pull OFF the road completely, turn off all lights, and wait; (4) wildlife crossings (saguaro cactus doesn't move, but javelinas, deer, and coyotes do); (5) summer tire blowout risk from combination of heat, overloading, and overinflation.

A Class A CDL allows you to operate any combination of vehicles with a Gross Vehicle Weight Rating (GVWR) of 26,001 lbs or more, provided the towed unit exceeds 10,000 lbs — this includes tractor-trailers and double/triple trailer rigs. A Class B CDL covers single vehicles with a GVWR of 26,001 lbs or more, or any such vehicle towing a unit not exceeding 10,000 lbs — this includes straight trucks and large buses. A Class C CDL is required for vehicles designed to carry 16 or more passengers (including the driver) or for vehicles transporting hazardous materials that require placarding, when those vehicles do not qualify for Class A or B.

CDL fees vary by state and by the class and endorsements you obtain. Most states charge separate fees for the CDL knowledge test ($10–$30 per attempt), the CDL skills test ($50–$150), and the CDL license itself ($50–$100). Additional fees apply for each endorsement (HazMat, Tanker, Passenger, etc.). The HazMat endorsement also requires a TSA security threat assessment fee of approximately $86. Check your Arizona DMV website for current fee schedules.

Federal regulations (49 CFR 383.133) require that CDL applicants be able to read and speak the English language sufficiently to understand highway traffic signs and signals and to respond to official inquiries. Many states offer CDL knowledge tests in Spanish and other languages for non-commercial knowledge questions, but the actual CDL test must be taken in a language that allows the driver to meet the English proficiency requirement. Check with the Arizona DMV for available language options.

In most states, a CDL is valid for 4–8 years (commonly 4–5 years). To renew your Arizona CDL, you typically need to visit a DMV office, pass a vision test, pay the renewal fee, and update your medical certification (DOT physical). If you hold a HazMat endorsement, your TSA background check must also be current. CDLs cannot generally be renewed online due to federal requirements for in-person verification of medical certification.

If you fail the CDL General Knowledge test in Arizona, you are typically required to wait a specified period (commonly 1–7 days) before retaking it. Most states allow 2–3 attempts before requiring additional waiting periods or study requirements. There is usually a retest fee for each attempt. Focus on the areas you missed — most states provide a score sheet showing which topic areas you need to review.