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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 Oklahoma hazmat test consists of 30 questions. To pass, you must correctly answer at least 24 questions (80%). The OK CDL hazmat test covers the information found in the Oklahoma 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. Escape ramps:
cannot be used by certain types of heavy vehicles.
should not be used unless you have already tried all other possible ways to save your vehicle after brake failure.
are designed to stop runaway vehicles safely.
2. Placards are used to:
warn motorcyclists to drive in another lane.
force other drivers to change lane.
warn others of hazardous materials.
3. If the letter "G" appears in Column 1 of the Hazardous Materials Table, the description must also include:
the hazard class or division.
the source of the HazMat.
the technical name of the HazMat.
4. If a shipping paper describes both hazardous and non-hazardous products, the hazardous materials must be:
written in a larger font.
identified by an "H" placed before the shipping description.
entered first.
5. During an en route inspection, you discover an overheated tire. You must:
remove the tire and place it a safe distance from your vehicle.
wait at least one hour before continuing your trip.
lower the tires air pressure by at least 15 psi.
6. Shipping papers:
should not be placed in the cab.
must be placed on all sides of the vehicle.
must specify what hazmat is being transported.
7. The basic description of hazardous materials does NOT include:
the name of the hazardous materials in italics.
hazard class or division.
ID number.
8. Before transporting sealed loads, you should check that:
the seal numbers match the placard numbers.
the load can be inspected.
the load is properly secured.
9. If hazardous materials are spilling from your vehicle while you are driving:
try to find the source of the leak by smell.
park the vehicle, secure the area and send someone else for help.
touch the leaking material to make sure it's not water.
10. ________ display the ID number of their contents on placards or orange panels.
Cargo tanks and other bulk packaging
The back of the truck and the gas tank
The gas tank and other bulk packaging
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Hazmat CDL Test (OK)

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