25 realistic Hazardous Materials practice questions for Illinois CDL applicants. Required for: Drivers transporting placarded hazardous materials. Official test: 30 questions, 24 correct to pass.
Question 1 of 25 · Parking
When is parking allowed for HazMat vehicles?
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A.
On highway shoulders for any reason
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B.
In safe locations away from open flames, heat sources, and people
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C.
Anywhere is fine
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D.
Only at truck stops
Correct answer: B.
Park away from people, fires, ignition sources, and within sight when possible.
Question 2 of 25 · Placards
Yellow placards generally indicate:
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A.
Flammable solids
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B.
Oxidizers
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C.
Corrosives
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D.
Radioactive materials
Correct answer: B.
Yellow placards usually indicate oxidizers.
Question 3 of 25 · Rail Crossings
When approaching railroad crossings hauling HazMat, you should:
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A.
Stop within 15-50 feet of the nearest rail
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B.
Stop only at marked crossings
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C.
Slow down only
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D.
Speed up to clear quickly
Correct answer: A.
Stop 15 to 50 feet from nearest rail. Don't shift gears while crossing.
Question 4 of 25 · Placards
When is a placard required for any quantity?
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A.
Some Table 1 materials such as Division 1.1 explosives
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B.
All HazMat over 1,001 pounds gross
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C.
Only Division 6 materials
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D.
Never required for small loads
Correct answer: A.
Table 1 materials require placards for any quantity.
Question 5 of 25 · Security
Which is true about HazMat security?
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A.
Drivers should keep doors locked when stopped
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B.
Drivers should never leave the vehicle unattended
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C.
Drivers must follow the carrier's security plan
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D.
All of the above
Correct answer: D.
All these practices reduce theft and tampering risk for HazMat.
Question 6 of 25 · Emergencies
When must drivers inform the carrier and emergency responders during a HazMat emergency?
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A.
As soon as it's safe to do so
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B.
When they reach the destination
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C.
Only after the cargo is unloaded
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D.
Only if asked
Correct answer: A.
Notify carrier and authorities immediately as soon as you can safely do so.
Question 7 of 25 · Shipping Papers
Drivers must check shipping papers for:
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A.
Proper shipping name, hazard class, identification number
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B.
Total quantity
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C.
Emergency response number
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D.
All of the above
Correct answer: D.
Each entry must include the shipping name, class, ID number, quantity, and emergency contact.
Question 8 of 25 · HazMat Driving
Drivers transporting Division 1.1, 1.2, or 1.3 explosives may NOT:
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A.
Take a route that goes through tunnels prohibiting explosives
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B.
Refuel at any station
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C.
Travel during business hours
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D.
Cross any state line
Correct answer: A.
Avoid tunnels and routes prohibiting explosives. Use only approved routes.
Question 9 of 25 · Emergencies
What does "ERG" stand for?
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A.
Emergency Response Guide
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B.
Energy Regulations Guide
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C.
Environmental Resource Guide
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D.
Emissions Reduction Guide
Correct answer: A.
The DOT Emergency Response Guidebook contains response info for HazMat incidents.
Question 10 of 25 · Placards
Which of these is required if a vehicle's placards are missing or destroyed?
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A.
Placards must be replaced before continuing
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B.
Drivers can continue without placards
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C.
Drivers must call OSHA
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D.
Drivers must wait until next shipping point
Correct answer: A.
Replace missing or damaged placards immediately before continuing.
Question 11 of 25 · HazMat Basics
Which is the goal of HazMat regulations?
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A.
To make HazMat transport safer for everyone
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B.
To allow easy transport of HazMat
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C.
To increase shipping costs
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D.
To require more inspections
Correct answer: A.
HazMat rules contain risk to public safety, property, and the environment.
Question 12 of 25 · Parking
Some HazMat vehicles cannot be parked within how many feet of a bridge, tunnel, or building?
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A.
100 feet
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B.
200 feet
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C.
300 feet
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D.
500 feet
Correct answer: C.
Class 1 (explosives) generally must not be parked within 300 feet of bridges, tunnels, or buildings.
Question 13 of 25 · Placards
Green placards usually indicate:
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A.
Compressed gases (non-flammable)
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B.
Explosives
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C.
Poisons
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D.
Corrosives
Correct answer: A.
Green placards usually indicate non-flammable compressed gases.
Question 14 of 25 · Placards
What does each placard show?
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A.
The hazard class number
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B.
A pictorial symbol for the hazard
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C.
The four-digit ID number when required
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D.
All of the above
Correct answer: D.
Placards show the hazard class number, symbol, and ID number when required.
Question 15 of 25 · Shipping Papers
Where do you find a list of names of hazardous wastes?
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A.
EPA Hazardous Waste Manifest
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B.
Driver manual
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C.
Local newspaper
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D.
CDL handbook
Correct answer: A.
Hazardous waste appears on the EPA hazardous waste manifest, signed by both shipper and driver.
Question 16 of 25 · Placards
What does "subsidiary hazard class" mean?
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A.
A secondary hazard a material poses
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B.
A backup placard
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C.
A small package
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D.
A vehicle accessory
Correct answer: A.
Some materials have a primary and a subsidiary hazard class for additional risks.
Question 17 of 25 · Loading
Which of the following must NEVER be transported with a HazMat shipment?
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A.
Routine cargo
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B.
Other foods
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C.
Class A or B explosives without segregation tables
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D.
Pet food
Correct answer: C.
Explosives have strict segregation rules. Always consult the segregation table.
Question 18 of 25 · Tank Operations
What does the term "outage" mean in HazMat tank operations?
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A.
Loss of electrical power
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B.
Empty space left in a tank to allow for liquid expansion
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C.
Out-of-service tank
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D.
A leak in the tank
Correct answer: B.
Outage is the empty space left for liquid expansion due to temperature changes.
Question 19 of 25 · HazMat Driving
What should a driver do before transporting any HazMat shipment?
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A.
Inspect the placards and shipping papers
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B.
Inspect the vehicle and cargo
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C.
Plan the route
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D.
All of the above
Correct answer: D.
Verify all paperwork, vehicle, cargo, and route before HazMat transport.
Question 20 of 25 · Placards
Which placard color usually means a flammable material?
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A.
Red
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B.
Yellow
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C.
Green
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D.
Blue
Correct answer: A.
Red typically indicates flammable materials.
Question 21 of 25 · Parking
When parking HazMat overnight, you should:
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A.
Park near homes
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B.
Choose well-lit, safe areas away from people and buildings
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C.
Park on the shoulder of any road
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D.
Park in residential areas
Correct answer: B.
Use safe, well-lit parking areas away from people and buildings.
Question 22 of 25 · Loading
What is "compatibility group letter"?
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A.
A code that tells which explosives can be loaded together
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B.
A type of placard
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C.
A type of vehicle
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D.
A type of safety vest
Correct answer: A.
Letters such as "A," "B," etc., classify explosives that can be transported together.
Question 23 of 25 · Shipping Papers
Which of these documents must accompany the HazMat?
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A.
Shipping papers
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B.
Hazard placards
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C.
Emergency response info
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D.
All of the above
Correct answer: D.
Shipping papers, placards, and emergency info must all accompany the load.
Question 24 of 25 · Loading
Which of these can never be hauled with explosives?
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A.
Cyanides or other toxic substances
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B.
Building materials
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C.
Foodstuffs
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D.
Newspapers
Correct answer: A.
Cyanides, certain other poisons, and other incompatible substances cannot be loaded with explosives.
Question 25 of 25 · Emergency Equipment
Are flares allowed when stopped near a HazMat leak?
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A.
Yes, always use flares
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B.
No, do not use flares near a HazMat leak — use reflective triangles
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C.
Only with permission
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D.
Only at night
Correct answer: B.
Open flames are dangerous near leaks. Use reflective triangles instead.
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 Illinois Secretary of State — Driver Services administers this knowledge test as part of its commercial driver license program. To earn the HazMat Endorsement (H) on your Illinois CDL, you need to score at least 24 out of 30 on the official version.
Topics covered on this practice test
- Placards: 7 questions
- Parking: 3 questions
- Shipping Papers: 3 questions
- Loading: 3 questions
- Emergencies: 2 questions
- HazMat Driving: 2 questions
- Rail Crossings: 1 question
- Security: 1 question
- HazMat Basics: 1 question
- Tank Operations: 1 question
- Emergency Equipment: 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 Illinois 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.