Page 1 of 154
Texas CDL HazMat Endorsement Exam QUESTIONS
AND VERIFIED ANSWERS LATEST UPDATE THIS
YEAR
Texas CDL HazMat Endorsement Exam,
POINT-FORM SUMMARIZED EXAM COVERAGE (No domain/section names)
• Hazard Classification System: The 9 DOT hazard classes (explosives, gases,
flammable/combustible liquids, flammable solids, oxidizers & organic peroxides, toxic &
infectious substances, radioactive materials, corrosives, miscellaneous dangerous goods) and
specific divisions within classes
• Placarding Rules: When placards are mandatory (1,001 lbs aggregate gross weight threshold),
exceptions, placement on all four sides of vehicle, and color/number coding systems
• Shipping Papers (Bill of Lading): Required information (proper shipping name, hazard class,
UN/NA number, quantity, packing group), emergency response telephone number, hazardous
waste manifest requirements, and accessibility rules while driving
• Marking & Labeling: Package labeling requirements, identification numbers, proper shipping
names, and the responsibility of shippers vs. carriers
• Loading & Unloading: Segregation of incompatible materials, package integrity checks,
attendance requirements during loading/unloading, and prohibitions on smoking or using open
flames near certain classes (1, 3, 4)
• Emergency Response Information: The Emergency Response Guidebook (ERG) usage, spill/leak
procedures (stop, secure area, call for help), and reporting requirements
• Driving & Parking Restrictions: Prohibited parking distances (300+ feet from
bridges/tunnels/buildings for explosives), tunnel restrictions, railroad crossing mandatory stops
for placarded vehicles, and route planning
• Cargo Tank & Bulk Packaging: Specific handling for liquid loads (surge, baffles), chlorine
transport (gas mask required), and proper filling procedures
• Security & Regulatory Compliance: TSA background check requirements (renewed every 5
years), 49 CFR Parts 100-185 regulations, safety permits for high-risk materials, and security
plans
• Training Requirements: Entry-Level Driver Training (ELDT) mandate, recurrent training every 3
years, and driver responsibilities
1. A driver is transporting 950 pounds of a material listed as "Flammable Liquid" on the Hazardous
Materials Table. What is the placarding requirement?
• A) No placard required because the weight is below 1,001 pounds
• B) Flammable placard required only on the rear
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• C) Red placard with 3-digit UN number on all four sides
• D) Class 2 placard required regardless of weight
• Answer: A
• Rationale: The general threshold for placarding most hazardous materials is 1,001 pounds or
more. Materials below this aggregate gross weight do not require placards unless specifically
listed with a lower threshold .
2. Which hazard class includes propane and anhydrous ammonia when transported as gases?
• A) Class 1 (Explosives)
• B) Class 2 (Gases) – Divisions 2.1, 2.2, or 2.3
• C) Class 3 (Flammable Liquids)
• D) Class 4 (Flammable Solids)
• Answer: B
• Rationale: Class 2 covers all compressed and liquefied gases. Propane is Division 2.1 (flammable
gas), while anhydrous ammonia is Division 2.2 (non-flammable, non-toxic gas) .
, Page 3 of 154
3. You are driving a placarded vehicle approaching a railroad crossing. What must you do?
• A) Proceed normally if the lights are not flashing
• B) Stop no closer than 15 feet and no farther than 50 feet from the nearest rail
• C) Slow down and sound the horn
• D) Stop only if there are other vehicles present
• Answer: B
• Rationale: Placarded vehicles must stop at all railroad crossings regardless of whether the
crossing is active. The driver must stop between 15 and 50 feet from the nearest rail .
4. A shipping paper lists both hazardous and non-hazardous materials. How must the hazardous
materials be identified?
• A) Written in red ink only
• B) Listed at the top of the page in any color
• C) Highlighted in a contrasting color or marked with an "X" in the HM column
• D) Placed on a separate page with a paperclip
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• Answer: C
• Rationale: Federal regulations require that hazardous materials on a mixed shipping paper be
clearly identifiable. This is typically done by highlighting them in a contrasting color (like yellow)
or placing an "X" in the hazardous material column .
5. You are transporting chlorine in a cargo tank. What specific personal protective equipment must be in
the vehicle?
• A) A supplied-air respirator system
• B) An approved gas mask
• C) Chemical splash goggles only
• D) A full-body chemical suit
• Answer: B
• Rationale: Specific regulations apply to hazardous gases like chlorine. An approved gas mask
(canister-type) must be carried in the vehicle to protect the driver during an unexpected leak .
6. What does the "Trefoil" symbol (three-bladed radiation symbol) on a placard indicate?
Texas CDL HazMat Endorsement Exam QUESTIONS
AND VERIFIED ANSWERS LATEST UPDATE THIS
YEAR
Texas CDL HazMat Endorsement Exam,
POINT-FORM SUMMARIZED EXAM COVERAGE (No domain/section names)
• Hazard Classification System: The 9 DOT hazard classes (explosives, gases,
flammable/combustible liquids, flammable solids, oxidizers & organic peroxides, toxic &
infectious substances, radioactive materials, corrosives, miscellaneous dangerous goods) and
specific divisions within classes
• Placarding Rules: When placards are mandatory (1,001 lbs aggregate gross weight threshold),
exceptions, placement on all four sides of vehicle, and color/number coding systems
• Shipping Papers (Bill of Lading): Required information (proper shipping name, hazard class,
UN/NA number, quantity, packing group), emergency response telephone number, hazardous
waste manifest requirements, and accessibility rules while driving
• Marking & Labeling: Package labeling requirements, identification numbers, proper shipping
names, and the responsibility of shippers vs. carriers
• Loading & Unloading: Segregation of incompatible materials, package integrity checks,
attendance requirements during loading/unloading, and prohibitions on smoking or using open
flames near certain classes (1, 3, 4)
• Emergency Response Information: The Emergency Response Guidebook (ERG) usage, spill/leak
procedures (stop, secure area, call for help), and reporting requirements
• Driving & Parking Restrictions: Prohibited parking distances (300+ feet from
bridges/tunnels/buildings for explosives), tunnel restrictions, railroad crossing mandatory stops
for placarded vehicles, and route planning
• Cargo Tank & Bulk Packaging: Specific handling for liquid loads (surge, baffles), chlorine
transport (gas mask required), and proper filling procedures
• Security & Regulatory Compliance: TSA background check requirements (renewed every 5
years), 49 CFR Parts 100-185 regulations, safety permits for high-risk materials, and security
plans
• Training Requirements: Entry-Level Driver Training (ELDT) mandate, recurrent training every 3
years, and driver responsibilities
1. A driver is transporting 950 pounds of a material listed as "Flammable Liquid" on the Hazardous
Materials Table. What is the placarding requirement?
• A) No placard required because the weight is below 1,001 pounds
• B) Flammable placard required only on the rear
, Page 2 of 154
• C) Red placard with 3-digit UN number on all four sides
• D) Class 2 placard required regardless of weight
• Answer: A
• Rationale: The general threshold for placarding most hazardous materials is 1,001 pounds or
more. Materials below this aggregate gross weight do not require placards unless specifically
listed with a lower threshold .
2. Which hazard class includes propane and anhydrous ammonia when transported as gases?
• A) Class 1 (Explosives)
• B) Class 2 (Gases) – Divisions 2.1, 2.2, or 2.3
• C) Class 3 (Flammable Liquids)
• D) Class 4 (Flammable Solids)
• Answer: B
• Rationale: Class 2 covers all compressed and liquefied gases. Propane is Division 2.1 (flammable
gas), while anhydrous ammonia is Division 2.2 (non-flammable, non-toxic gas) .
, Page 3 of 154
3. You are driving a placarded vehicle approaching a railroad crossing. What must you do?
• A) Proceed normally if the lights are not flashing
• B) Stop no closer than 15 feet and no farther than 50 feet from the nearest rail
• C) Slow down and sound the horn
• D) Stop only if there are other vehicles present
• Answer: B
• Rationale: Placarded vehicles must stop at all railroad crossings regardless of whether the
crossing is active. The driver must stop between 15 and 50 feet from the nearest rail .
4. A shipping paper lists both hazardous and non-hazardous materials. How must the hazardous
materials be identified?
• A) Written in red ink only
• B) Listed at the top of the page in any color
• C) Highlighted in a contrasting color or marked with an "X" in the HM column
• D) Placed on a separate page with a paperclip
, Page 4 of 154
• Answer: C
• Rationale: Federal regulations require that hazardous materials on a mixed shipping paper be
clearly identifiable. This is typically done by highlighting them in a contrasting color (like yellow)
or placing an "X" in the hazardous material column .
5. You are transporting chlorine in a cargo tank. What specific personal protective equipment must be in
the vehicle?
• A) A supplied-air respirator system
• B) An approved gas mask
• C) Chemical splash goggles only
• D) A full-body chemical suit
• Answer: B
• Rationale: Specific regulations apply to hazardous gases like chlorine. An approved gas mask
(canister-type) must be carried in the vehicle to protect the driver during an unexpected leak .
6. What does the "Trefoil" symbol (three-bladed radiation symbol) on a placard indicate?
