Question 1 of 25 · Placards
Yellow placards generally indicate:
- A. Flammable solids
- B. Oxidizers
- C. Corrosives
- D. Radioactive materials
Correct answer: B.
Yellow placards usually indicate oxidizers.
Idaho Hazardous Materials CDL Practice Test
25 realistic Hazardous Materials practice questions for Idaho CDL applicants. Required for: Drivers transporting placarded hazardous materials. Official test: 30 questions, 24 correct to pass.
Question 2 of 25 · Emergencies
Drivers must report HazMat incidents to:
- A. The local newspaper
- B. Carrier and law enforcement, then the National Response Center
- C. No one — drivers are not responsible
- D. The shipper only
Correct answer: B.
Notify your carrier and local responders, then call the National Response Center if reportable.
Question 3 of 25 · HazMat Basics
What's the most important reason for these regulations?
- A. Public safety
- B. Protect the environment
- C. Protect the carrier
- D. All of the above
Correct answer: D.
Regulations protect people, property, and the environment.
Question 4 of 25 · Security
Which of these is part of the carrier's security plan?
- A. Personnel security
- B. Unauthorized access prevention
- C. En-route security
- D. All of the above
Correct answer: D.
Carrier security plans cover personnel checks, access controls, and en-route security.
Question 5 of 25 · Placards
How many sides of a HazMat vehicle must be placarded?
- A. One
- B. Two
- C. Three
- D. Four
Correct answer: D.
Placards must be displayed on all four sides of the vehicle.
Question 6 of 25 · Shipping Papers
Where can a driver find information about which HazMat are flammable?
- A. Hazardous Materials Table
- B. CDL test only
- C. Engine manual
- D. Driver license documents
Correct answer: A.
The DOT Hazardous Materials Table classifies materials and lists handling requirements.
Question 7 of 25 · Shipping Papers
Where do you find a list of names of hazardous wastes?
- A. EPA Hazardous Waste Manifest
- B. Driver manual
- C. Local newspaper
- D. CDL handbook
Correct answer: A.
Hazardous waste appears on the EPA hazardous waste manifest, signed by both shipper and driver.
Question 8 of 25 · HazMat Basics
Which is the goal of HazMat regulations?
- A. To make HazMat transport safer for everyone
- B. To allow easy transport of HazMat
- C. To increase shipping costs
- D. To require more inspections
Correct answer: A.
HazMat rules contain risk to public safety, property, and the environment.
Question 9 of 25 · Parking
When can a HazMat shipment be left unattended?
- A. Whenever the driver leaves the vehicle
- B. Only in safe locations such as a carrier facility
- C. Anywhere with a sign
- D. Only on private roads
Correct answer: B.
HazMat must be attended unless parked at a carrier facility or other approved location.
Question 10 of 25 · CDL Rules
Drivers transporting HazMat must have:
- A. Only a regular driver license
- B. A valid CDL with HazMat endorsement and TSA security threat assessment
- C. A passport
- D. Physician's certification only
Correct answer: B.
A current CDL with HazMat endorsement (and TSA background check) is required.
Question 11 of 25 · Shipping Papers
What information must a HazMat driver have on the bills of lading?
- A. Total quantity by weight or volume
- B. Number and type of packages
- C. Shipping name and hazard class
- D. All of the above
Correct answer: D.
All of these must be included for HazMat shipments.
Question 12 of 25 · HazMat Driving
What should a driver do before transporting any HazMat shipment?
- A. Inspect the placards and shipping papers
- B. Inspect the vehicle and cargo
- C. Plan the route
- D. All of the above
Correct answer: D.
Verify all paperwork, vehicle, cargo, and route before HazMat transport.
Question 13 of 25 · Emergencies
What does "ERG" stand for?
- A. Emergency Response Guide
- B. Energy Regulations Guide
- C. Environmental Resource Guide
- D. Emissions Reduction Guide
Correct answer: A.
The DOT Emergency Response Guidebook contains response info for HazMat incidents.
Question 14 of 25 · Hours of Service
Drivers transporting hazardous materials must keep a written record of duty status because:
- A. It's a federal regulation for HazMat operations
- B. Insurance requires it
- C. It looks professional
- D. Drivers don't need to keep records
Correct answer: A.
Federal hours-of-service rules apply to HazMat drivers as to other CMV drivers.
Question 15 of 25 · Rail Crossings
What is the maximum stopping distance allowed for HazMat vehicles approaching a railroad crossing?
- A. Stop within 15-50 feet of the nearest rail and not closer than 15 feet
- B. Stop on the tracks
- C. Stop only when train is approaching
- D. No stop required
Correct answer: A.
HazMat vehicles must stop 15 to 50 feet from the nearest rail before crossing.
Question 16 of 25 · Emergency Equipment
Which of the following is a sign of a tire fire?
- A. Smoke from the tire
- B. A loud noise
- C. Vibration in the steering
- D. All of the above
Correct answer: D.
Watch for smoke, noise, and vibration as warning signs of a tire fire.
Question 17 of 25 · Emergency Equipment
Which type of fire is most likely to occur with HazMat?
- A. Tire fires
- B. Electrical fires
- C. Engine compartment fires
- D. All of the above
Correct answer: D.
Any of these can occur — pre-trip and en-route inspections reduce risk.
Question 18 of 25 · Loading
What does the term "marking" refer to?
- A. Marking the shipper's name on the package
- B. Putting the proper shipping name and ID number on the package
- C. Marking the truck's plates
- D. Marking the route on a map
Correct answer: B.
Marking includes the proper shipping name and the four-digit ID number on the package.
Question 19 of 25 · Loading
When loading or unloading HazMat:
- A. Set the parking brake
- B. Be sure the cargo is properly braced
- C. Stay close to the vehicle
- D. All of the above
Correct answer: D.
Keep the brakes set, secure cargo, and remain on alert during loading and unloading.
Question 20 of 25 · Placards
How are placards different from labels?
- A. Labels go on packages; placards go on vehicles
- B. Placards go on packages and labels go on vehicles
- C. They are the same
- D. Labels are only required outside the U.S.
Correct answer: A.
Labels mark individual packages; placards identify HazMat on vehicles.
Question 21 of 25 · Parking
When parking HazMat overnight, you should:
- A. Park near homes
- B. Choose well-lit, safe areas away from people and buildings
- C. Park on the shoulder of any road
- D. Park in residential areas
Correct answer: B.
Use safe, well-lit parking areas away from people and buildings.
Question 22 of 25 · Placards
When must placards be displayed?
- A. Before the vehicle is loaded
- B. Once the HazMat is loaded and secured before driving
- C. After the trip ends
- D. Only at weigh stations
Correct answer: B.
Drivers must placard once HazMat is loaded and verify before moving the vehicle.
Question 23 of 25 · Placards
What does each placard show?
- A. The hazard class number
- B. A pictorial symbol for the hazard
- C. The four-digit ID number when required
- D. All of the above
Correct answer: D.
Placards show the hazard class number, symbol, and ID number when required.
Question 24 of 25 · Loading
You should turn off your engine when:
- A. Loading or unloading flammable liquids
- B. Driving on a hill
- C. Inspecting brakes
- D. Refueling on the highway
Correct answer: A.
Turn off the engine when loading or unloading flammable liquids to reduce ignition risk.
Question 25 of 25 · Loading
What is "compatibility group letter"?
- A. A code that tells which explosives can be loaded together
- B. A type of placard
- C. A type of vehicle
- D. A type of safety vest
Correct answer: A.
Letters such as "A," "B," etc., classify explosives that can be transported together.
About the Hazardous Materials Test
The Hazardous Materials (HazMat) test covers the rules for transporting materials that pose a risk to health, safety, and property. Topics include the hazardous materials table, shipping papers, marking, labeling, placarding, loading and unloading, bulk packaging, driving and parking rules, communications, emergencies, and hazardous materials regulations enforced by the U.S. Department of Transportation Pipeline and Hazardous Materials Safety Administration. A federal Transportation Security Administration (TSA) background check is also required.
The Idaho Transportation Department — Driver Services administers this knowledge test as part of its commercial driver license program. To earn the HazMat Endorsement (H) on your Idaho CDL, you need to score at least 24 out of 30 on the official version.
Topics covered on this practice test
- Placards: 5 questions
- Loading: 4 questions
- Shipping Papers: 3 questions
- Emergencies: 2 questions
- HazMat Basics: 2 questions
- Parking: 2 questions
- Emergency Equipment: 2 questions
- Security: 1 question
- CDL Rules: 1 question
- HazMat Driving: 1 question
- Hours of Service: 1 question
- Rail Crossings: 1 question
How to use this practice test
- Read each question carefully. CDL questions are written precisely — small wording differences matter.
- Click "Show Answers & Explanations" only after answering every question. Don't peek mid-test.
- Read the explanation for every question, even ones you got right. The reasoning is more important than the answer.
- Repeat the test until you score 100%. The questions are deterministic per state, so you can track your improvement over multiple sessions.
- Move on to the other endorsement tests for Idaho until you're ready for the official exam.
Tips specific to the Hazardous Materials test
HazMat is the longest knowledge test (30 questions) and adds a Transportation Security Administration (TSA) background check. Most candidates struggle with placard colors, the segregation table, shipping paper requirements, and emergency response procedures. Use the official Emergency Response Guidebook (ERG) alongside this practice set.