- Updated for January 2025
- Based on 2025 CO commercial driver's license manual
Free Colorado CDL HazMat Practice Test 2025
Colorado. Ah! The freedom that comes with driving through the Rocky Mountains. Since you’re on this site, you must be interested in the sweet opportunities available once you’ve added the Hazardous Materials (Hazmat) endorsement to your Commercial Driver’s License (CDL). Why wouldn’t you be? This endorsement expands your job potential to an entire sector of organizations requiring this particular transport expertise. More jobs, more potential income. (If you’re younger than 21, you won’t be eligible for the Hazmat endorsement but don’t be discouraged. Check out our Double/Triple Trailers endorsement practice tests for intrastate driving.)
The Hazmat endorsement will permit you to transport materials that the U.S. government has deemed hazardous, like explosives, certain types of fuel, industrial chemicals, radioactive materials, and infectious substances. You might be worried and thinking: “Do I really want to transport radioactive materials?” Rest assured, the most important objective of this endorsement process is to ensure the utmost level of safety.
First, you’ll need to pass a Transportation Security Administration (TSA) fingerprinting and background check. The results from TSA can take weeks, so you’ll want to take advantage of that waiting period by preparing for the second major hurdle: the DMV knowledge test. The knowledge test is made up of 30 questions (24 out of 30 answers must be correct) and addresses federal regulations, substance handling, material packaging, and more (Colorado CDL Handbook 2025).
In the Centennial State, there are multiple industries that require a Hazmat endorsement, including chemicals used in mining (such as explosives and solvents), propane, gasoline, and materials used in oil and gas production. Ball Corporation (Boulder) and Xcel Energy (Denver) are just two of the companies needing truck drivers with a Hazmat endorsement. Excited about the growing list of opportunities? Let’s get you prepared!
Our online DMV Colorado CDL Hazmat Endorsement practice tests are strategically designed to focus on the necessary information. We get straight to what’s relevant, and our practice tests mimic what you will face on the official DMV test. If you get a question wrong, you’re immediately provided with an explanation of why another answer choice is correct. Once you have your TSA results in hand and feel prepared, you’ll visit the DMV with the necessary documents, pay the fees, and confidently take the test.
- Perfect for first-time and renewal CDL/CLP applicants, and those adding endorsements
- Triple-checked for accuracy
What you need to know
What to expect on the actual CO DMV exam
questions
correct answers to pass
passing score
Helpful links
List of questions (classic view)
- What are the two main places where the hazardous identification number appears?
- The Emergency Response Guidebook (ERG)
- Which of the following is NOT an acceptable type of marking for hazardous materials?
- If you are already carrying 100 pounds of silver cyanide, what precautions must you take if you are given papers at the dock to carry 100 cartons of battery acid?
- Do you need to stop before a railroad crossing if you are hauling 100 pounds of Division 4.3 materials?
- You must NEVER smoke, or perform any activity involving fire, within 25 feet of
- Your engine runs a pump when you are delivering compressed gas. After finishing the delivery, when should you turn off the engine?
- Which of the following three hazard classes should NOT be placed into a temperature-controlled trailer (one with a heater/air conditioner unit)?
- If you are carrying Division 1.2 or 1.3 materials, how far away must you park from the traveled portion of the roadway?
- Besides the shipping papers and the packages, the other two places where the hazardous material identification number must appear are
- To determine if you need to use placards, which of the following do you NOT need to know?
- Cargo tanks are
- What action should you take if you discover your hazardous materials shipment leaking at a rest stop but there is no phone available?
- A placarded vehicle must carry a fire extinguisher with a minimum rating of
- Which of the following hazard classes uses a transport index to determine how much of it can be loaded on a single vehicle for transport?
- What is the purpose of a driver placarding his or her vehicle?
- How far away are you allowed to park from a bridge, tunnel, or building if you are carrying Division 1.2 or 1.3 materials?
- What are the major differences between a cargo tank and a portable tank?
- Which of the following is a necessary qualification for non-bulk packaging?
- In what location must you keep your shipping papers that describe any hazardous materials?
- Which of the following materials is an acceptable floor liner for moving Division 1.1 or 1.2 materials?
- What is a technical name?
- How often should you check the tires on a placarded trailer that has dual tires?
- When shippers package the material, they are trying to
- A safe haven is
- A hazard class name or ID number may not be used to describe
- A vehicle contains 500 pounds each of Division 1.1 explosives and Division 1.2 explosives. You must have
- If the word “Forbidden” appears in the Hazard class column of an entry in the hazardous materials table,
- A vehicle placarded for hazardous materials must have placards on ____ sides.
- At a rest stop, you discover that your hazardous materials shipment is leaking but there is no phone available. What do you do?
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