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New York CDL HazMat study materials
New York CDL HazMat study resources

New York CDL HazMat practice questions

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Question 1Hazardous Materials (CDL-10 Section 9 / CDL-11 Hazardous Materials Manual)

Under the hazardous materials regulations, a material with a flash point of 80°F (27°C) that is a liquid is best classified as which hazard class?

  1. Class 4 flammable solid
  2. Class 3 flammable liquid Correct answer.
  3. Class 9 miscellaneous
  4. Class 8 corrosive

Explanation

Class 3 covers flammable liquids, generally those with a flash point of not more than 60°C (140°F). A liquid with a flash point of 80°F falls inside that range, so it is a Class 3 material. Class 4 is for flammable solids, Class 8 for corrosives, and Class 9 for materials that do not fit another class.

Question 2Hazardous Materials (CDL-10 Section 9 / CDL-11 Hazardous Materials Manual)

A shipping paper entry for a hazardous material must include which of the following items?

  1. The route the driver intends to take
  2. The driver's home address and license number
  3. The basic description in the proper sequence, including the UN identification number Correct answer.
  4. The consignee's telephone number and delivery appointment

Explanation

The basic description on a shipping paper must appear in a required sequence: identification number, proper shipping name, hazard class or division, and packing group, followed by any required additional information. Personal data about the driver and delivery scheduling details are not part of the basic description.

Question 3Hazardous Materials (CDL-10 Section 9 / CDL-11 Hazardous Materials Manual)

When you are hauling hazardous materials and must stop at a railroad crossing, what is the required procedure?

  1. Slow to 15 mph and proceed without a full stop
  2. Stop within 50 feet but not less than 15 feet from the nearest rail and remain stopped until safe to proceed Correct answer.
  3. Stop only if a train is visible or a signal is active
  4. Stop on the tracks briefly to check both directions

Explanation

Drivers carrying hazardous materials must stop before railroad crossings, within 50 feet but not less than 15 feet from the nearest rail. They must stay stopped and listen and look until it is safe to cross. Never stop on the tracks.

Question 4Hazardous Materials (CDL-10 Section 9 / CDL-11 Hazardous Materials Manual)

What does the number in the lower half of a placard (the hazard identification number) indicate?

  1. The DOT registration number of the carrier
  2. The weight of the package in kilograms
  3. The emergency response guide number
  4. The specific hazard of the material, such as 3 for flammable or 8 for corrosive Correct answer.

Explanation

On a placard, the hazard class or division number appears in the lower corner, identifying the hazard such as 3 for flammable liquid or 8 for corrosive. The four-digit identification number on the orange panel or in the upper area identifies the specific material.

Question 5Hazardous Materials (CDL-10 Section 9 / CDL-11 Hazardous Materials Manual)

A vehicle must display hazardous materials placards when it is carrying which of the following?

  1. 500 pounds of a Table 1 material
  2. 1,001 pounds aggregate gross weight of materials in Table 2 of the placarding tables Correct answer.
  3. Only materials requiring a shipping paper
  4. Any amount of a material in Table 2

Explanation

For Table 2 materials, placards are required when the aggregate gross weight of all hazardous materials in that category reaches 1,001 pounds or more. Table 1 materials require placarding for any quantity. Shipping papers are required regardless of placarding thresholds.

Question 6Hazardous Materials (CDL-10 Section 9 / CDL-11 Hazardous Materials Manual)

While driving, you discover a hazardous materials leak from your cargo. What should you do first?

  1. Continue to the nearest receiver so they can handle the spill
  2. Open the container to identify the source of the leak
  3. Wash the spill off the vehicle with water immediately
  4. Stop, secure the area, and keep people away while you notify authorities Correct answer.

Explanation

When a leak is discovered, the driver should stop, keep people away from the area, and notify emergency responders and the carrier. Approaching or opening the container can expose the driver to the hazard. The shipping papers and emergency response information should be used to guide the response.

Question 7Hazardous Materials (CDL-10 Section 9 / CDL-11 Hazardous Materials Manual)

Which document must be within the driver's immediate reach while the vehicle is in operation carrying hazardous materials?

  1. The shipping papers Correct answer.
  2. The vehicle registration
  3. The bill of lading for nonhazardous freight
  4. The insurance certificate

Explanation

Shipping papers must be kept within the driver's immediate reach while the vehicle is in operation. When the driver leaves the cab, the papers must be left in a specified location such as on the driver's seat. Registration and insurance documents are not the hazardous materials shipping papers.

Question 8Hazardous Materials (CDL-10 Section 9 / CDL-11 Hazardous Materials Manual)

What is the primary purpose of the emergency response information that must accompany a hazardous materials shipment?

  1. To record the driver's hours of service
  2. To list the carrier's insurance coverage limits
  3. To show the delivery route and schedule
  4. To provide immediate guidance on handling fires, spills, and first aid for the material Correct answer.

Explanation

Emergency response information tells responders and the driver what to do in case of fire, spill, or exposure, including first aid and protective measures. It must be carried with the shipping papers. It is not a record of hours, insurance, or routing.

Question 9Hazardous Materials (CDL-10 Section 9 / CDL-11 Hazardous Materials Manual)

How should cylinders of compressed gas be secured in a vehicle?

  1. Upright and secured so they cannot move or fall Correct answer.
  2. Stored with the valve caps removed for ventilation
  3. Laid flat and stacked on top of each other
  4. Left loose so they can shift with the load

Explanation

Compressed gas cylinders must be kept upright and secured against movement during transport. Valve protection caps should remain in place when the cylinder is not in use. Loose or stacked cylinders can fall and rupture the valve, causing a violent release.

Question 10Hazardous Materials (CDL-10 Section 9 / CDL-11 Hazardous Materials Manual)

A driver is loading hazardous materials and nonhazardous freight. Which practice is correct?

  1. Load the heaviest hazardous materials on top
  2. Place all packages together to save space
  3. Remove package labels to speed loading
  4. Separate incompatible materials and secure all packages against movement Correct answer.

Explanation

Incompatible hazardous materials must be kept apart, and all packages must be secured against movement. Labels must remain visible and packages must not be loaded in a way that could damage them. Loading heavy items on top risks crushing lower packages.

Question 11Hazardous Materials (CDL-10 Section 9 / CDL-11 Hazardous Materials Manual)

What does a placard with the word 'DANGEROUS WHEN WET' indicate about the material?

  1. It is safe to handle with water in an emergency
  2. It is a nonhazardous material that requires no placard
  3. It is only hazardous when the vehicle is washed
  4. It reacts with water and may release heat or flammable gas Correct answer.

Explanation

Materials marked dangerous when wet react with water, often releasing heat or a flammable gas. In a fire, water should not be used on these materials unless the emergency response guide says otherwise. The placard warns responders to avoid water contact.

Question 12Hazardous Materials (CDL-10 Section 9 / CDL-11 Hazardous Materials Manual)

When transporting hazardous materials, the driver must be able to produce which of the following during a roadside inspection?

  1. A copy of the vehicle's warranty
  2. A personal logbook of all past trips
  3. The receiver's written acceptance form
  4. The shipping papers and emergency response information Correct answer.

Explanation

During an inspection, the driver must present the shipping papers and the emergency response information for the hazardous materials being carried. These documents tell enforcement and responders what is on board and how to handle it. Warranty, past trip logs, and receiver forms are not required for this purpose.

Question 13Hazardous Materials (CDL-10 Section 9 / CDL-11 Hazardous Materials Manual)

A driver is hauling a Class 7 radioactive material. Which statement about route and parking restrictions is correct?

  1. The carrier must follow the routing and parking rules that apply to radioactive shipments Correct answer.
  2. Radioactive shipments are exempt from all parking rules
  3. Radioactive shipments may park anywhere overnight
  4. Radioactive shipments may be left unattended in a tunnel

Explanation

Radioactive materials are subject to specific routing and parking requirements, including restrictions on parking near congested areas and tunnels. Carriers must comply with those rules and with any required permits. General exemptions for parking do not apply.

Question 14Hazardous Materials (CDL-10 Section 9 / CDL-11 Hazardous Materials Manual)

What is the correct action if a placarded vehicle is involved in a collision and the driver is unsure whether hazardous materials are leaking?

  1. Open the cargo to check for damage
  2. Assume there is no leak and drive away
  3. Treat the scene as hazardous, keep people away, and notify authorities Correct answer.
  4. Move the vehicle into traffic to clear the lane

Explanation

When in doubt after a collision, the driver should treat the scene as hazardous, keep bystanders away, and notify emergency responders. The shipping papers identify what is on board so responders can act appropriately. Driving away or opening the cargo can worsen the situation.

Question 15Hazardous Materials (CDL-10 Section 9 / CDL-11 Hazardous Materials Manual)

Which of the following is a requirement for the hazardous materials endorsement on a CDL?

  1. Complete a defensive driving course only
  2. Pass a knowledge test and undergo a TSA security threat assessment Correct answer.
  3. Submit a letter from the carrier only
  4. Pass a vision test only

Explanation

To obtain the hazardous materials endorsement, the driver must pass the hazardous materials knowledge test and complete the TSA security threat assessment, including fingerprinting. A carrier letter or a single skills test does not satisfy the requirement.

Question 16Hazardous Materials (CDL-10 Section 9 / CDL-11 Hazardous Materials Manual)

What information does the four-digit identification number on an orange panel or shipping paper provide?

  1. It identifies the specific hazardous material for emergency response lookup Correct answer.
  2. It gives the vehicle's gross weight
  3. It shows the placard expiration date
  4. It lists the driver's endorsements

Explanation

The four-digit UN identification number identifies the specific hazardous material and is used to look up emergency response guidance. It appears on shipping papers and on orange panels or placards. It does not convey weight, driver qualifications, or expiration dates.

Question 17Hazardous Materials (CDL-10 Section 9 / CDL-11 Hazardous Materials Manual)

When may a driver smoke while operating a vehicle carrying hazardous materials?

  1. Only when the windows are open
  2. Never, and smoking must also be prohibited within 25 feet of the vehicle during loading or unloading Correct answer.
  3. Only during loading, not unloading
  4. Only when the material is nonflammable

Explanation

Smoking is prohibited while operating a vehicle carrying hazardous materials and within 25 feet of the vehicle during loading and unloading. The restriction applies regardless of whether the specific material is flammable, because vapors may still present a risk.

Question 18Hazardous Materials (CDL-10 Section 9 / CDL-11 Hazardous Materials Manual)

A driver must stop and check for a hazardous materials leak when which of the following occurs?

  1. Only when the vehicle is washed
  2. Only when a placard falls off
  3. Only at the final destination
  4. After the first 50 miles of a trip and every 150 miles or every 3 hours thereafter Correct answer.

Explanation

Drivers of placarded vehicles must stop and inspect the cargo for leaks after the first 50 miles and then every 150 miles or every 3 hours, whichever comes first. This early and periodic check helps catch leaks before they become serious.

Question 19Hazardous Materials (CDL-10 Section 9 / CDL-11 Hazardous Materials Manual)

What does the hazard class number '2.3' on a placard represent?

  1. Flammable gas
  2. Oxidizing gas
  3. Nonflammable gas
  4. Poisonous gas Correct answer.

Explanation

Division 2.3 is poisonous gas. Division 2.1 is flammable gas, and Division 2.2 is nonflammable, nonpoisonous compressed gas. There is no Division 2.4 for oxidizing gas in the placard scheme.

Question 20Hazardous Materials (CDL-10 Section 9 / CDL-11 Hazardous Materials Manual)

Which of the following is true about the use of a hazardous materials placard on an empty vehicle that previously contained a hazardous material?

  1. Placards are never required on empty vehicles
  2. Placards may be replaced with a 'nonhazardous' sign
  3. Placards may remain if the vehicle has not been cleaned of residue, depending on the regulations Correct answer.
  4. Placards must always be removed immediately after unloading

Explanation

Regulations address placarding of vehicles that contain residue of hazardous materials; in some cases placards remain required until the vehicle is cleaned. Removing placards prematurely can mislead responders about the residual hazard. A generic 'nonhazardous' sign is not a substitute for required placards.

Question 21Hazardous Materials (CDL-10 Section 9 / CDL-11 Hazardous Materials Manual)

When a driver is parking a vehicle carrying hazardous materials, which practice is recommended?

  1. Park on a shoulder of a busy highway
  2. Park in a crowded rest area with the engine running
  3. Leave the vehicle unlocked and unattended
  4. Park in a secure area away from traffic and check the vehicle before leaving Correct answer.

Explanation

Hazardous materials vehicles should be parked in a secure area away from traffic, and the driver should check the vehicle before leaving it. Crowded areas, busy shoulders, and unlocked unattended vehicles increase the risk of theft, vandalism, or collision.

Question 22Hazardous Materials (CDL-10 Section 9 / CDL-11 Hazardous Materials Manual)

What is the purpose of the segregation table in the hazardous materials regulations?

  1. To determine the driver's rest breaks
  2. To show which hazardous materials must not be loaded together in the same vehicle Correct answer.
  3. To calculate the shipping cost per mile
  4. To list the states that require permits

Explanation

The segregation table indicates which hazard classes may not be loaded together because they could react dangerously. Drivers use it when planning loads to keep incompatible materials apart. It does not address costs, rest breaks, or state permits.

Question 23Hazardous Materials (CDL-10 Section 9 / CDL-11 Hazardous Materials Manual)

A driver is hauling a material whose shipping paper shows the proper shipping name 'Gasoline' with the identification number UN1203. What does UN1203 identify?

  1. Ammonia
  2. Propane
  3. Gasoline Correct answer.
  4. Diesel fuel

Explanation

UN1203 is the identification number assigned to gasoline. The identification number must match the proper shipping name on the shipping paper and on any orange panel or placard. Diesel fuel, propane, and ammonia have different identification numbers.

Question 24Hazardous Materials (CDL-10 Section 9 / CDL-11 Hazardous Materials Manual)

What should a driver do with the shipping papers when leaving the vehicle to register at a facility?

  1. Leave them in a specified location in the cab, such as on the driver's seat Correct answer.
  2. Take them into the building and lock them in an office
  3. Leave them on the ground beside the vehicle
  4. Destroy them after delivery

Explanation

When the driver leaves the vehicle, shipping papers must be left in a specified location, such as on the driver's seat, so they are available to responders. Taking them away removes critical information from the scene. Destroying them is never appropriate.

Question 25Hazardous Materials (CDL-10 Section 9 / CDL-11 Hazardous Materials Manual)

Which statement best describes the driver's responsibility regarding hazardous materials labels on packages?

  1. The driver may remove labels that are hard to read
  2. Labels are optional if the shipping paper is complete
  3. The driver should verify that labels are present and legible before accepting the load Correct answer.
  4. Labels are only needed on the outside of the trailer

Explanation

The driver should check that packages are properly labeled and that labels are legible before accepting the shipment, since labels communicate the hazard to handlers and responders. Labels must not be removed by the driver, and a complete shipping paper does not replace package labels.

Question 26Hazardous Materials (CDL-10 Section 9 / CDL-11 Hazardous Materials Manual)

A shipping paper entry reads: 'R 12, UN1075, 2.2, 3 cylinders'. What does the 'R' preceding the identification number indicate on this entry?

  1. The shipment is a reportable quantity Correct answer.
  2. The material is a residue of a hazardous substance
  3. The entry is a radioactive material requiring route control
  4. The material is regulated only in bulk packaging

Explanation

On a shipping paper, the letter 'R' placed before the basic description signals that the material is a reportable quantity for a hazardous substance. Because the RQ threshold has been met, the shipment triggers additional emergency planning and notification duties. It is not a residue symbol and has nothing to do with bulk-only regulation.

Question 27Hazardous Materials (CDL-10 Section 9 / CDL-11 Hazardous Materials Manual)

A driver must select placards for a vehicle. Which statement about placard placement is correct?

  1. Placards may be placed on the cargo tank's interior frame
  2. Placards must be on the front, both sides, and rear of the vehicle Correct answer.
  3. Placards are required only on the rear of the power unit
  4. Placards are needed only when the vehicle crosses a state line

Explanation

Placarding rules require hazard warning placards to be displayed on the front, both sides, and rear of the vehicle, so the hazard is visible from every approach. Placards must be readable and placed on the vehicle itself, not hidden on an interior frame. Interstate travel is not the trigger; the quantity and type of material are.

Question 28Hazardous Materials (CDL-10 Section 9 / CDL-11 Hazardous Materials Manual)

A driver is reviewing the hazard class for a material described as 'Oxidizer'. Which placard and class number apply?

  1. Class 6.1
  2. Class 8
  3. Class 3
  4. Class 5.1 Correct answer.

Explanation

Oxidizers fall under Class 5.1, and the placard carries that class number along with the oxidizer symbol. Class 3 covers flammable liquids, Class 8 covers corrosives, and Class 6.1 covers toxic materials. Matching the class number to the hazard is essential for correct placarding.

Question 29Hazardous Materials (CDL-10 Section 9 / CDL-11 Hazardous Materials Manual)

A driver is hauling a bulk package of a hazardous material. How must the vehicle be attended under the attendance rules?

  1. It may be left unattended for up to one hour at a truck stop
  2. It may be left unattended if the parking brake is set
  3. It may be left unattended if the doors are locked
  4. It must be attended by a qualified person at all times unless specific exceptions apply Correct answer.

Explanation

A motor vehicle containing hazardous materials in bulk must be attended by a qualified person at all times, with narrow exceptions such as secure parking areas or short breaks within sight of the vehicle. Locking the doors or setting the brake does not satisfy the attendance rule. The qualified person must be awake, within view, and able to move the vehicle if needed.

Question 30Hazardous Materials (CDL-10 Section 9 / CDL-11 Hazardous Materials Manual)

A driver is preparing to load packages marked with the CORROSIVE label. Which loading practice is appropriate?

  1. Load corrosives against the vehicle's electrical panel
  2. Stack heavy corrosive packages above food-grade cargo
  3. Load corrosives so leaking material cannot reach incompatible cargo Correct answer.
  4. Place corrosives next to cyanide salts to save space

Explanation

Corrosives must be loaded so that any leakage will not contact incompatible materials or reach other cargo, and they must be kept away from foodstuffs. Segregation rules forbid loading corrosives with certain other classes such as cyanides. Positioning packages against electrical components is also unsafe.

Question 31Hazardous Materials (CDL-10 Section 9 / CDL-11 Hazardous Materials Manual)

A driver is inspecting a package before loading. Which marking must appear on a non-bulk package of a hazardous material?

  1. The consignee's telephone number
  2. The driver's license number of the carrier
  3. The proper shipping name and identification number Correct answer.
  4. The date the material was manufactured

Explanation

Non-bulk packages must be marked with the proper shipping name and the identification number, along with other required marks such as the UN prefix. These marks let handlers and responders identify the material without opening the package. Consignee phone numbers and manufacturing dates are not required package markings.

Question 32Hazardous Materials (CDL-10 Section 9 / CDL-11 Hazardous Materials Manual)

A driver is reviewing a shipping paper before departure. Which entry is required to appear on the shipping paper for a hazardous materials shipment?

  1. The hazard class and the total quantity of material Correct answer.
  2. The route the driver plans to take
  3. The vehicle's license plate number
  4. The total number of packages and the type of packaging

Explanation

Shipping papers must show the basic description, including the hazard class and the total quantity of material, along with the proper shipping name and identification number. Package count and packaging type are not part of the required basic description. License plates and planned routes are not shipping paper entries.

Question 33Hazardous Materials (CDL-10 Section 9 / CDL-11 Hazardous Materials Manual)

A driver is hauling a shipment of Division 1.1 explosives. Which statement about this shipment is correct?

  1. The vehicle may carry detonators and other explosives together without restriction
  2. The vehicle may be left unattended if the engine is off
  3. The vehicle may use any tunnel if the load is under 500 pounds
  4. The vehicle must be placarded and may not be parked near a bridge or tunnel Correct answer.

Explanation

Division 1.1 explosives present a mass explosion hazard, so the vehicle must be placarded and kept away from places such as bridges, tunnels, and crowded areas when parked. Detonators must be segregated from other explosives. Special route and parking restrictions apply, and the vehicle may not be left unattended.

Question 34Hazardous Materials (CDL-10 Section 9 / CDL-11 Hazardous Materials Manual)

A driver is preparing to transport a material that is poisonous by inhalation. Which hazard class and placard apply?

  1. Class 8, corrosive
  2. Class 4.3, dangerous when wet
  3. Class 6.1, poison
  4. Class 2.3, poison gas Correct answer.

Explanation

Materials that are poisonous by inhalation and are gases fall under Class 2.3 and use the poison gas placard. Class 6.1 covers toxic solids and liquids, not inhalation-toxic gases. Class 8 and Class 4.3 describe different hazards entirely.

Question 35Hazardous Materials (CDL-10 Section 9 / CDL-11 Hazardous Materials Manual)

A driver is hauling a load that requires placards but contains less than 1,001 pounds of a single hazardous material. Which statement about placarding is correct?

  1. Placards are required only on the rear below 1,001 pounds
  2. Placards are never required below 1,001 pounds
  3. Placards are optional if the shipper provides a note
  4. Placards are required for any amount of a Table 1 material Correct answer.

Explanation

Table 1 materials, which include certain highly dangerous hazards, require placards at any quantity, while Table 2 materials generally require placards at 1,001 pounds or more. A shipper's note cannot waive a placarding requirement. Placard placement does not change with the quantity.

Question 36Hazardous Materials (CDL-10 Section 9 / CDL-11 Hazardous Materials Manual)

A driver must know the meaning of the 'DANGEROUS WHEN WET' placard. Which hazard class does this placard represent?

  1. Class 4.3 Correct answer.
  2. Class 4.1
  3. Class 5.2
  4. Class 4.2

Explanation

The 'DANGEROUS WHEN WET' placard corresponds to Class 4.3, materials that emit flammable gas when they contact water. Class 4.1 covers flammable solids, Class 4.2 covers spontaneously combustible materials, and Class 5.2 covers organic peroxides. Keeping Class 4.3 materials dry is critical.

Question 37Hazardous Materials (CDL-10 Section 9 / CDL-11 Hazardous Materials Manual)

A driver is hauling a hazardous materials shipment and must park overnight. Which practice is correct?

  1. Park next to a railroad crossing for quick departure
  2. Park on a public street near a hospital
  3. Park under a bridge to protect the load from rain
  4. Park in a secure area away from populated places and tunnels Correct answer.

Explanation

Hazardous materials vehicles should be parked in a secure area away from populated places, tunnels, bridges, and other sensitive locations. Parking near hospitals, under bridges, or beside railroad crossings increases risk to the public. Local rules may also restrict parking in certain areas.

Question 38Hazardous Materials (CDL-10 Section 9 / CDL-11 Hazardous Materials Manual)

A driver is reviewing emergency response information that must accompany a hazardous materials shipment. Which item is required to be included?

  1. The driver's home terminal phone number
  2. A description of the hazards and immediate precautions to take Correct answer.
  3. The name of the carrier's insurance company
  4. The consignee's billing address

Explanation

Emergency response information must describe the hazards of the material and the immediate precautions to take in an incident, along with first aid and firefighting guidance. Insurance company names, billing addresses, and terminal phone numbers are not part of that information. It must be kept with the shipping paper.

Question 39Hazardous Materials (CDL-10 Section 9 / CDL-11 Hazardous Materials Manual)

A driver is hauling a hazardous material whose shipping paper shows an emergency response telephone number. What is the driver's responsibility regarding that number?

  1. Verify the number is monitored at all times during transport Correct answer.
  2. Call the number before every trip to confirm the route
  3. Record the number only if an incident occurs
  4. Replace the number with the carrier's dispatch line

Explanation

The emergency response telephone number on the shipping paper must be monitored at all times while the material is in transportation, and the driver should be able to provide it to responders. The driver does not need to call it before each trip or substitute a dispatch line. Recording it only after an incident defeats its purpose.

Question 40Hazardous Materials (CDL-10 Section 9 / CDL-11 Hazardous Materials Manual)

A driver carrying hazardous materials must know which hazard communication items belong on or with the vehicle. Which set is required?

  1. Placards, shipping papers, and emergency response information Correct answer.
  2. Bill of lading, fuel receipts, and insurance cards
  3. Labels, packing slips, and delivery manifests
  4. Route map, weight tickets, and logbook only

Explanation

Hazard communication for a hazardous materials shipment relies on placards on the vehicle, shipping papers describing the material, and emergency response information kept with the papers. Fuel receipts, packing slips, and weight tickets do not convey hazard information. These items must be accessible to responders and inspectors.

Question 41Hazardous Materials (CDL-10 Section 9 / CDL-11 Hazardous Materials Manual)

A driver is inspecting a cargo tank before loading a corrosive liquid. Which condition should prevent loading?

  1. The tank has a dent that could weaken its structure Correct answer.
  2. The tank's placards are clean and readable
  3. The tank's exterior was recently washed
  4. The tank's valves were recently inspected

Explanation

A cargo tank with structural damage such as a dent that could weaken it must not be loaded until it is inspected and cleared, because the tank may fail and release the material. Clean placards, inspected valves, and a washed exterior are signs of good condition. The driver should refuse the load and report the defect.

Question 42Hazardous Materials (CDL-10 Section 9 / CDL-11 Hazardous Materials Manual)

A driver is hauling a hazardous material that is forbidden from being transported through certain tunnels. What should the driver do when planning the route?

  1. Drive through at night when traffic is light
  2. Use the tunnel if the load weighs less than 1,000 pounds
  3. Ask the shipper to remove the placards at the tunnel
  4. Plan a route that avoids the restricted tunnels Correct answer.

Explanation

When a material is restricted from certain tunnels or routes, the driver must plan a compliant route that avoids those locations. Weight, time of day, or removing placards does not make an unlawful tunnel transit acceptable. Removing required placards would itself violate the regulations.

Question 43Hazardous Materials (CDL-10 Section 9 / CDL-11 Hazardous Materials Manual)

A driver is involved in an incident with a placarded load and must notify authorities. Which information should the driver be prepared to provide?

  1. The vehicle's maintenance history
  2. The names of all other drivers at the terminal
  3. The material's proper shipping name and the nature of the incident Correct answer.
  4. The carrier's profit margin for the shipment

Explanation

When reporting a hazardous materials incident, the driver should provide the material's proper shipping name, identification number, and details such as the amount released and any injuries. Financial, personnel, and maintenance records are irrelevant to the emergency response. Clear hazard information helps responders act safely.

Question 44Hazardous Materials (CDL-10 Section 9 / CDL-11 Hazardous Materials Manual)

A driver is reviewing the hazard class for a material labeled 'Spontaneously Combustible'. Which class does this label represent?

  1. Class 4.1
  2. Class 4.2 Correct answer.
  3. Class 4.3
  4. Class 5.1

Explanation

Spontaneously combustible materials are Class 4.2; they can ignite without an external ignition source when exposed to air. Class 4.1 is flammable solid, Class 4.3 is dangerous when wet, and Class 5.1 is oxidizer. Recognizing the label helps the driver handle and segregate the material correctly.

Question 45Hazardous Materials (CDL-10 Section 9 / CDL-11 Hazardous Materials Manual)

A driver is loading a hazardous material next to a package of food. Which practice is correct?

  1. Load the food beneath the hazardous material without separation
  2. Load both together if the food is wrapped
  3. Load the hazardous material above the food to save space
  4. Keep the hazardous material separated so it cannot contaminate the food Correct answer.

Explanation

Hazardous materials must be kept separate from food so that a leak or spill cannot contaminate it. Wrapping does not justify loading them together, and placing hazardous material above food increases contamination risk. Proper segregation protects public health.

Question 46Hazardous Materials (CDL-10 Section 9 / CDL-11 Hazardous Materials Manual)

A driver is reviewing the hazard class for a material described as 'Organic Peroxide'. Which class number applies?

  1. Class 5.1
  2. Class 6.1
  3. Class 8
  4. Class 5.2 Correct answer.

Explanation

Organic peroxides are Class 5.2 and require temperature control in many cases because they can react dangerously when heated. Class 5.1 is oxidizer, Class 6.1 is toxic, and Class 8 is corrosive. Correctly identifying the class guides handling and segregation decisions.

Question 47Hazardous Materials (CDL-10 Section 9 / CDL-11 Hazardous Materials Manual)

A driver is hauling a hazardous material and must stop for a railroad crossing. Which action is correct?

  1. Stop only if the load is explosive
  2. Stop, look, and listen before crossing, as required for placarded vehicles Correct answer.
  3. Stop only when the vehicle is empty
  4. Proceed without stopping if the crossing has lights

Explanation

Placarded vehicles carrying hazardous materials must stop at railroad crossings, look both ways, and listen before proceeding, even when signals appear clear. The requirement is not limited to explosives or empty vehicles. Skipping the stop because of crossing lights is unsafe and unlawful.

Question 48Hazardous Materials (CDL-10 Section 9 / CDL-11 Hazardous Materials Manual)

A driver is reviewing a shipping paper and sees the entry 'UN1203, Gasoline, 3, PG II'. Which part of this entry is the hazard class?

  1. UN1203
  2. 3 Correct answer.
  3. PG II
  4. Gasoline

Explanation

In the basic description, the hazard class appears after the proper shipping name; here, '3' identifies a flammable liquid. 'UN1203' is the identification number, 'Gasoline' is the proper shipping name, and 'PG II' is the packing group. Reading the sequence correctly helps the driver match placards and emergency information.

Question 49Hazardous Materials (CDL-10 Section 9 / CDL-11 Hazardous Materials Manual)

A driver is preparing to transport a hazardous material that requires a placard. Which statement about placard design is correct?

  1. Placards must be at least 10 3/4 inches square and display the hazard class number Correct answer.
  2. Placards must be printed in black and white only
  3. Placards may be handwritten on plain paper
  4. Placards may be any size as long as the color is correct

Explanation

Placards must meet the regulatory size of at least 10 3/4 inches on each side and show the hazard class number, symbol, and color for the material. Handwritten paper signs and arbitrary sizes do not meet the standard. Correct placard design ensures visibility and quick recognition by responders.

Question 50Hazardous Materials (CDL-10 Section 9 / CDL-11 Hazardous Materials Manual)

A driver is reviewing the hazard class for a material described as 'Infectious Substance'. Which class number applies?

  1. Class 7
  2. Class 8
  3. Class 6.1
  4. Class 6.2 Correct answer.

Explanation

Infectious substances are Class 6.2, which covers materials known or reasonably expected to contain pathogens. Class 6.1 is toxic material, Class 7 is radioactive material, and Class 8 is corrosive. The distinction matters for handling, packaging, and response.