Arizona Hazardous Materials (H) Practice Test

The endorsement for hauling placarded hazardous materials — and the hardest knowledge test most drivers ever take, because it's built on tables: hazard classes, the placarding rules, the segregation chart for what can't ride together, and shipping-paper requirements. It's also the only endorsement wrapped in federal security requirements — a TSA security threat assessment with fingerprinting comes before the state will issue it, and the endorsement must be renewed on a cycle rather than earned once. The pay bump exists precisely because the barrier is real.

Who needs it: Drivers hauling placarded loads — tankers of fuel, chemicals, compressed gases. Required before the H prints on the license.

Sample practice questions

A driver counts as "attending" a placarded vehicle when the driver is:

Answer: On the vehicle awake (not in the sleeper), or within 100 feet with an unobstructed view, and able to act — Attending means awake and on the vehicle (not in the sleeper) or within 100 feet with a clear view, plus knowing the hazards and being able to move the vehicle.

A small diamond hazard symbol placed on a package is called a:

Answer: Label — Labels go on packages; placards go on the vehicle.

The chart used to decide which classes can ride together is the:

Answer: Segregation (separation) table — The segregation/separation table shows which classes may or may not be loaded together.

Common mistakes on the HazMat test

  • Trying to memorize the whole segregation table instead of the handful of pairings the test actually probes
  • Confusing when placards are required by ANY amount versus the 1,001-lb table threshold
  • Forgetting the shipping-paper rules — within reach, visible, and where they ride when you leave the cab
  • Not budgeting for the TSA screening timeline — the knowledge test is one step, the background check is its own clock

Studying with the full Truckcess course does double duty: the theory counts toward the federal ELDT requirement (Truckcess is listed on the FMCSA Training Provider Registry).

Official source: Arizona Department of Transportation, Motor Vehicle Division

CDL licensing in Arizona is administered by the Arizona Department of Transportation, Motor Vehicle Division. Fees, scheduling, forms, and the official Arizona CDL manual live on the official site: ADOT MVD — official CDL page (verified 2026-08-09).

Truckcess is not affiliated with or endorsed by the Arizona Department of Transportation, Motor Vehicle Division. Our practice tests cover the federal CDL knowledge standards (49 CFR Part 383) that every state exam is built on; exact question counts, fees, and procedures vary by state and change over time — the official site is always the authority.

More Arizona practice tests

Full prep courses are one-time from $59 with 12 months of access — mytruckcess.com/cdl.

CDL practice tests by state · Meet the Course Director · The completion certificate