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Any driver, regardless of the vehicle Class, who wants to haul hazardous materials, must add an “H” endorsement to their CDL. In order to obtain the Hazmat endorsement drivers are required to pass a Transportation Security Administration background check and a knowledge test. The Missouri hazmat test consists of 30 questions. To pass, you must correctly answer at least 24 questions (80%). The MO CDL hazmat test covers the information found in the Missouri CDL Manual. Study the chapter covering hazardous materials to learn how to recognize, handle, and transport Hazmat, then take this practice test to prepare for your exam!
1. Who must mark and label the hazardous materials?
The carrier
The driver
The shipper
2. With brake drums, if brakes become too hot:
your ABS will malfunction.
the brakes will supply too much power to the drive wheels.
the brakes may stop working.
3. How can you tell if your vehicle is equipped with ABS?
Look for yellow ABS malfunction lamps on the instrument panel.
Trailers will have yellow ABS malfunction lamps on the left side.
All of the above.
4. What is a safe haven?
A place where hazardous materials can be safely dumped.
The storage container tank where hazardous materials must be stored.
An approved place for parking unattended vehicles loaded with explosives.
5. When backing a trailer, turn the wheel right to make the cab go ________ and the trailer go ________.
left; right
right; left
left; left
6. With low beams, drivers can see ahead about:
15 feet
100 feet
250 feet
7. Which of the following may be used to warn of a stopped vehicle carrying explosives?
Reflective triangles
Liquid burning flares
8. Which of the following hazard classes should NOT be placed into a temperature-controlled trailer?
Classes 1, 3, and 4
Classes 1, 2.1, and 3
Classes 1, 3, and 5.1
9. If you are being tailgated, you should:
speed up.
increase your following distance.
move to the left lane.
10. When the temperature drops:
bridges usually freeze after other parts of the roadway.
bridges will not freeze.
bridges will freeze before the road will.
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MO CDL Hazmat Test

Number of questions: 30
Correct answers to pass:24
Passing score:80%
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