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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 Iowa hazmat test consists of 30 questions. To pass, you must correctly answer at least 24 questions (80%). The IA CDL hazmat test covers the information found in the Iowa 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. When driving on slippery surfaces, a lack of spray from other vehicles indicates that:
the pavement is dry.
ice has formed on the road.
there is no ice on the road surface.
2. What should you do if you doubt you have safe space to pass under a low bridge?
If no warnings are posted, assume there is enough clearance under the bridge and proceed slowly.
Go slowly, and take another route if you are not sure you can make it.
Increase the weight of your vehicle to clearing under the bridge.
3. While crossing railroad tracks, you should:
shift up.
not shift gears.
shift down.
4. Who must mark and label the hazardous materials?
The carrier
The shipper
The driver
5. When you use your mirrors while driving on the road, you should:
check them quickly.
only use the driver's side mirror.
avoid checking them regularly.
6. When your drive wheels have poor traction, you should:
turn the retarder off.
turn the retarder on.
only use the retarder on the front wheels.
7. Passive railroad crossings:
have at least one traffic control device.
do not have traffic control devices.
should never be crossed using a CMV.
8. What is the main difference between portable tanks and cargo tanks?
Portable tanks are not permanently attached to a vehicle.
The product is loaded or unloaded while the portable tanks are off the vehicle.
All of the above.
9. Most heavy vehicles require ________ change gears.
double shifting
single clutching
double clutching
10. You are inspecting your vehicle during a trip. What should you do?
Check critical items such as tires, brakes, and lights.
Use your senses to check for problems.
All of the above.
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IA CDL Hazmat Test

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