CDL Hazmat Endorsement Practice Test 2026: Practice test 4

Practice test 4 of 4 for the CDL Hazmat Endorsement Practice Test: 15 more questions with answers and explanations.

Commercial vehicle
United States
90 questions
Checked October 10, 2026

Question 1 of 15
You stop near a vehicle carrying flammable liquid. What warning devices should you use?
- Fusees placed behind the vehicle
- Burning flares set close to the truck
- Reflective triangles or red electric lights
- Open-flame lanterns on the road
Show answer
Answer: C. Reflective triangles or red electric lights
Never use burning flares or fusees near flammable cargo. Use reflective triangles or red electric lights.
Question 2 of 15
Which routes should placarded hazmat vehicles avoid when possible?
- Crowded areas, tunnels and narrow streets
- Signed truck routes and bypasses
- Roads with truck stops and rest areas
- Interstate highways and freeways
Show answer
Answer: A. Crowded areas, tunnels and narrow streets
Unless there is no practical choice, avoid heavily populated areas, crowds, tunnels and narrow streets.
Question 3 of 15
What must the carrier give a driver hauling Division 1.1, 1.2 or 1.3 explosives?
- Only a road map and the delivery address
- Nothing beyond the normal shipping papers
- Only a spare set of placards for the trip
- A written route plan, the rules, and emergency instructions
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Answer: D. A written route plan, the rules, and emergency instructions
Carriers must give the driver a written route plan, a copy of Part 397, and emergency procedures, and the driver signs for them.
Question 4 of 15
What special equipment must you carry when hauling chlorine in a cargo tank?
- A gas can and a hand pump
- An approved gas mask and a leak kit
- Snow chains and extra cross-links
- A spare battery and jumper cables
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Answer: B. An approved gas mask and a leak kit
Drivers hauling chlorine must have an approved gas mask and an emergency kit for leaks.
Question 5 of 15
Which book helps emergency workers decide what to do with a hazmat spill?
- The model CDL manual
- The vehicle owner's manual
- The driver's daily logbook
- The Emergency Response Guidebook
Show answer
Answer: D. The Emergency Response Guidebook
The DOT Emergency Response Guidebook is used by firefighters and police. It is indexed by shipping name and ID number.
Question 6 of 15
You are in a hazmat crash. What should you do with the shipping papers?
- Leave them locked inside the trailer
- Throw them away to avoid confusion
- Keep them and give them to responders
- Hide them in the cab to protect them
Show answer
Answer: C. Keep them and give them to responders
Emergency workers need the shipping papers to know what is in the load.
Question 7 of 15
After a hazmat crash or leak, where should you keep people?
- Close by to help
- Downwind of the spill
- Inside the trailer
- Far away and upwind
Show answer
Answer: D. Far away and upwind
Keep people far away from the scene and upwind of the material.
Question 8 of 15
Material is leaking from a package. What should you NOT do?
- Call for help right away
- Touch or smell the material
- Warn others of the danger
- Keep people away from it
Show answer
Answer: B. Touch or smell the material
Never touch or smell leaking material. Find out what it is from the shipping papers and labels.
Question 9 of 15
Should a driver fight a hazmat fire?
- Not unless trained and equipped to do so
- Yes, by opening the trailer to let smoke out
- Yes, with any extinguisher
- Yes, always with water
Show answer
Answer: A. Not unless trained and equipped to do so
Don't try to fight hazardous materials fires unless you have the right training and equipment.
Question 10 of 15
There may be a fire in your trailer. What should you do before opening the doors?
- Open them quickly to check the load
- Spray water in through a small crack
- Feel the doors for heat; don't open if hot
- Drive faster so the wind cools it
Show answer
Answer: C. Feel the doors for heat; don't open if hot
Opening hot doors can feed a fire with air. Feel for heat first.
Question 11 of 15
After a crash, how far should explosives be moved from vehicles and occupied buildings?
- At least 200 feet
- At least 50 feet
- At least 1 mile
- At least 10 feet
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Answer: A. At least 200 feet
If it is safe to unload them, place explosives at least 200 feet from vehicles and occupied buildings.
Question 12 of 15
What is the phone number of the National Response Center?
- 1-888-373-7888
- 911 only
- 1-800-424-9300
- 1-800-424-8802
Show answer
Answer: D. 1-800-424-8802
The National Response Center, 1-800-424-8802, takes reports of hazmat spills and passes them to the right agencies.
Question 13 of 15
What is CHEMTREC?
- A type of placard used on tank trucks
- A hazard class for chemical waste
- A 24-hour hazmat emergency information center
- A brand of dry chemical fire extinguisher
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Answer: C. A 24-hour hazmat emergency information center
CHEMTREC is a 24-hour center that gives emergency workers technical information about hazardous materials.
Question 14 of 15
After a leak of radioactive material, when may the vehicle be used again?
- Right away, once the leaking package is removed
- After it is washed down with plenty of water
- After it is parked outside for at least 24 hours
- Only after it is cleaned and checked with a meter
Show answer
Answer: D. Only after it is cleaned and checked with a meter
Notify your dispatcher. The vehicle may not be used until it is decontaminated and checked.
Question 15 of 15
Which of these is part of the driver's role at a hazmat emergency?
- Keeping people away and warning responders
- Moving leaking packages by hand
- Driving the vehicle away from the scene
- Cleaning up the spill alone right away
Show answer
Answer: A. Keeping people away and warning responders
Keep people away, limit the spread only if you can do it safely, communicate the danger, and give information to responders.

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