Free CDL Tanker Practice Test 2026

A Tanker endorsement (code "N") authorizes you to drive vehicles designed to transport liquid or gaseous materials in bulk tanks with a capacity of 1,000 gallons or more. It covers both hazardous and non-hazardous liquids.

Tankers have a high center of gravity, making them prone to rollovers. Liquid cargo creates "surge" - it moves forward when you brake and sideways in turns. This makes controlling the vehicle more challenging than regular trailers.

Surge is the movement of liquid inside a partially filled tank. When you brake, liquid moves forward; when you turn, it moves sideways. This can push your vehicle in unintended directions. Baffles help reduce (but not eliminate) surge.

Baffled tanks have internal walls with holes that help reduce liquid surge. Unbaffled (smooth bore) tanks are required for food-grade liquids like milk because baffles are hard to clean. Unbaffled tanks have more severe surge.

20 questions, multiple choice. You need 16 right to pass (80%). Most states don't have a time limit.

No, the Tanker endorsement requires only a written knowledge test. However, if you're getting a Class A CDL for the first time, you'll need to pass the regular CDL skills test.

No. For hazardous liquids, you need both the Tanker (N) AND HazMat (H) endorsements, combined as the "X" endorsement. The X endorsement requires a TSA background check.

The test covers: tank vehicle inspection, driving techniques for high center of gravity, liquid surge effects, safe following distance, emergency procedures, and loading/unloading procedures. For a complete vehicle inspection walk-through, see our pre-trip inspection checklist.

Tanker drivers earn an average of $75,000/year, about 60% more than general freight drivers. Fuel tanker drivers often earn more due to the specialized nature of the work.

The Tanker endorsement is valid as long as your CDL is valid. When you renew your CDL, you may need to retake the knowledge test (varies by state).

Yes. "Tanker endorsement", "tank endorsement", "Tankers endorsement" and "N endorsement" all refer to the same CDL "N" code that authorizes you to drive tank vehicles. We use the names interchangeably.

Our online Tanker practice test works as a free study guide - every wrong answer comes with an explanation. For a printable Tanker study guide PDF, download Section 8 ("Tank Vehicles") from your state's CDL manual on the DMV/DOT website and pair it with our Tanker test questions and answers above.

You can take this Tanker practice test online for free as many times as you want. The official DMV/DOT Tanker knowledge test must be taken in person at your state licensing office, but practicing online first is the fastest way to pass on day one.

Yes - every question is built from the current DOT/FMCSA CDL manual (Section 8: Tank Vehicles) and matches what your state DMV, DPS or DOT will ask on the real Tanker endorsement test.