I85PREP
⌘ K
Mississippi CDL HazMat Endorsement Test study materials
Mississippi CDL HazMat Endorsement Test study resources

Mississippi CDL HazMat Endorsement Test practice questions

One question at a time. Build your Mississippi CDL HazMat Endorsement Test understanding.

First 50 of 200 questions. Each one lists the choices, the correct answer, and an explanation. The checker at the top of this page saves progress in this browser when it is available.

Continue in the practice tool above to load more questions, 50 at a time.

Question 1Hazardous materials regulations, definitions, and operational requirements (49 CFR Parts 171-180; HM endorsement rules)

Under the HM endorsement rules, a driver must pass the hazardous materials knowledge test and also meet which additional federal requirement before the endorsement is issued?

  1. A Mississippi state hazardous materials handling license
  2. A commercial driver medical waiver specific to hazmat
  3. A written recommendation from the shipper
  4. A Transportation Security Administration security threat assessment Correct answer.

Explanation

The hazmat endorsement requires a successful TSA security threat assessment in addition to the knowledge test and the standard CDL requirements. The states cannot issue the endorsement until TSA eligibility is confirmed.

Question 2Hazardous materials regulations, definitions, and operational requirements (49 CFR Parts 171-180; HM endorsement rules)

A hazmat endorsement holder is convicted of a disqualifying felony involving the manufacture or distribution of a controlled substance. What is the required consequence for the endorsement?

  1. The endorsement remains valid until the next renewal cycle
  2. The endorsement is converted to a tank vehicle endorsement
  3. The endorsement is permanently revoked and cannot be reinstated Correct answer.
  4. The endorsement is suspended for 60 days

Explanation

Federal rules require that a hazmat endorsement be permanently revoked, and the driver is barred from obtaining a new one, after conviction of certain felonies including controlled substance offenses. The revocation is not a temporary suspension.

Question 3Hazardous materials regulations, definitions, and operational requirements (49 CFR Parts 171-180; HM endorsement rules)

For hazmat endorsement purposes, the required TSA security threat assessment must be completed how often to keep the endorsement valid?

  1. Every two years
  2. Every year
  3. Every five years Correct answer.
  4. Only once, at initial issuance

Explanation

The security threat assessment must be renewed on a recurring cycle tied to the endorsement, which is five years. The driver pays a fee and completes the application again at each renewal.

Question 4Hazardous materials regulations, definitions, and operational requirements (49 CFR Parts 171-180; HM endorsement rules)

A material is listed in the Hazardous Materials Table with the proper shipping name "Gasoline" and hazard class 3. What does hazard class 3 identify?

  1. A corrosive material
  2. A flammable gas
  3. A flammable liquid Correct answer.
  4. An oxidizing substance

Explanation

Class 3 covers flammable and combustible liquids, and gasoline is the classic example. Flammable gases are Class 2.1, oxidizers are Class 5.1, and corrosives are Class 8.

Question 5Hazardous materials regulations, definitions, and operational requirements (49 CFR Parts 171-180; HM endorsement rules)

Which placard is required for a shipment of a Division 6.1 material that is toxic by inhalation and meets the poison inhalation hazard criteria?

  1. FLAMMABLE placard
  2. CORROSIVE placard
  3. OXIDIZER placard
  4. POISON INHALATION HAZARD placard Correct answer.

Explanation

Materials meeting the poison inhalation hazard criteria must display the POISON INHALATION HAZARD placard. This placard signals a heightened inhalation risk requiring special handling and emergency response.

Question 6Hazardous materials regulations, definitions, and operational requirements (49 CFR Parts 171-180; HM endorsement rules)

A driver is hauling a load of hazardous materials and must stop at a railroad crossing. What is the correct procedure?

  1. Stop, look both ways, listen, and proceed only when clear Correct answer.
  2. Slow down and proceed without stopping if the gates are up
  3. Honk and cross without stopping
  4. Stop only if a train is visible

Explanation

Drivers of vehicles carrying hazardous materials must stop at railroad crossings, look and listen in both directions, and proceed only when the tracks are clear. This applies even when signals show no train approaching.

Question 7Hazardous materials regulations, definitions, and operational requirements (49 CFR Parts 171-180; HM endorsement rules)

When may a driver of a vehicle carrying hazardous materials leave the vehicle unattended?

  1. Only when the cargo is nonflammable
  2. Only when the engine is running and brakes are set
  3. Only when the vehicle is within the driver's view and the keys are removed Correct answer.
  4. Only when the vehicle is parked in a secure lot

Explanation

A hazmat vehicle may be left unattended only when it is within the driver's view, the engine is off, and the keys are removed, among other conditions. This prevents unauthorized movement and theft of hazardous cargo.

Question 8Hazardous materials regulations, definitions, and operational requirements (49 CFR Parts 171-180; HM endorsement rules)

A shipping paper for a hazardous materials shipment must include which of the following items?

  1. The proper shipping name, hazard class, and identification number Correct answer.
  2. The vehicle's license plate number
  3. The driver's license number and home address
  4. The receiver's telephone number only

Explanation

Shipping papers must show the proper shipping name, hazard class or division, and the identification number, among other required entries. These elements let responders identify the material quickly.

Question 9Hazardous materials regulations, definitions, and operational requirements (49 CFR Parts 171-180; HM endorsement rules)

During transport, where must the shipping papers for a hazardous materials load be kept?

  1. Locked in the trailer with the cargo
  2. In the glove compartment or on the driver's seat, within immediate reach Correct answer.
  3. Mailed to the receiver in advance
  4. Stored in the sleeper berth under the mattress

Explanation

Shipping papers must be kept within the driver's immediate reach while the vehicle is moving, such as in the glove compartment or on the seat. They must be readily available to emergency responders.

Question 10Hazardous materials regulations, definitions, and operational requirements (49 CFR Parts 171-180; HM endorsement rules)

A driver is preparing to load hazardous materials and notices the packages are not marked with the required hazard labels. What should the driver do?

  1. Apply the labels personally before loading
  2. Load the packages and note the missing labels on the shipping paper
  3. Load only the packages that appear safe
  4. Refuse to load the packages until they are properly marked and labeled Correct answer.

Explanation

Packages must be marked and labeled before transport, and a driver should not accept improperly prepared packages. Loading them shifts risk and violates the regulations.

Question 11Hazardous materials regulations, definitions, and operational requirements (49 CFR Parts 171-180; HM endorsement rules)

Which document must accompany a hazardous materials shipment and describe the emergency response information for the material?

  1. A vehicle registration card
  2. An emergency response information sheet or guidebook Correct answer.
  3. A bill of lading only
  4. A driver qualification file

Explanation

Emergency response information must accompany the shipment so responders know how to handle a spill or fire. It is often provided as a guidebook page or a separate emergency response sheet.

Question 12Hazardous materials regulations, definitions, and operational requirements (49 CFR Parts 171-180; HM endorsement rules)

A driver is hauling a placarded load and approaches a tunnel marked with a restriction on hazardous materials. What is the correct action?

  1. Stop inside the tunnel and wait for clearance
  2. Proceed through the tunnel because the placard is visible
  3. Take an alternate route that complies with the restriction Correct answer.
  4. Remove the placards and proceed

Explanation

Tunnel restrictions prohibit certain hazardous materials from passing through, and the driver must use an alternate compliant route. Removing placards to evade the restriction is illegal.

Question 13Hazardous materials regulations, definitions, and operational requirements (49 CFR Parts 171-180; HM endorsement rules)

A driver must park a vehicle containing Division 1.1 explosives. Which parking practice complies with the regulations?

  1. Park in a secure lot away from bridges, tunnels, and populated areas Correct answer.
  2. Park next to a fuel depot for convenience
  3. Park under an overpass for shade
  4. Park on a public street near a residential area overnight

Explanation

Explosives must be parked in a secure location away from bridges, tunnels, and congested areas to reduce risk. Parking near populated areas or fuel storage increases the consequences of an incident.

Question 14Hazardous materials regulations, definitions, and operational requirements (49 CFR Parts 171-180; HM endorsement rules)

What does the identification number on an orange panel or placard tell an emergency responder?

  1. The four-digit UN or NA number identifying the specific material Correct answer.
  2. The weight of the shipment
  3. The date the material was manufactured
  4. The driver's route number

Explanation

The four-digit identification number corresponds to a specific hazardous material in the Hazardous Materials Table, letting responders look up the material and its hazards. It is not a weight, date, or route code.

Question 15Hazardous materials regulations, definitions, and operational requirements (49 CFR Parts 171-180; HM endorsement rules)

A driver is transporting a hazardous material and is involved in a collision that results in a spill. Which action is required first?

  1. Wait for the shipper to arrive before calling anyone
  2. Continue to the destination to report the spill
  3. Take photographs and leave the scene
  4. Stop, secure the scene, and notify authorities as required Correct answer.

Explanation

After a spill, the driver must stop, keep people away, and notify emergency responders and authorities promptly. Continuing the trip or waiting for the shipper delays response to a release.

Question 16Hazardous materials regulations, definitions, and operational requirements (49 CFR Parts 171-180; HM endorsement rules)

Which federal agency publishes the Hazardous Materials Regulations found in 49 CFR Parts 171 through 180?

  1. The Federal Motor Carrier Safety Administration
  2. The Environmental Protection Agency
  3. The Pipeline and Hazardous Materials Safety Administration Correct answer.
  4. The Occupational Safety and Health Administration

Explanation

PHMSA administers the Hazardous Materials Regulations in 49 CFR Parts 171-180. FMCSA regulates motor carrier safety, while EPA and OSHA have separate environmental and workplace roles.

Question 17Hazardous materials regulations, definitions, and operational requirements (49 CFR Parts 171-180; HM endorsement rules)

A material's hazard class is Division 2.2. What hazard does this indicate?

  1. A nonflammable, nonpoisonous compressed gas Correct answer.
  2. A radioactive material
  3. A flammable liquid
  4. A corrosive liquid

Explanation

Division 2.2 covers nonflammable, nonpoisonous compressed gases, including oxygen and nitrogen. Flammable gases are 2.1, radioactive materials are Class 7, and corrosives are Class 8.

Question 18Hazardous materials regulations, definitions, and operational requirements (49 CFR Parts 171-180; HM endorsement rules)

A driver is loading drums of a corrosive liquid and a separate shipment of an oxidizer. Which practice is correct?

  1. Load both materials together because both are hazardous
  2. Place the oxidizer on top of the corrosive drums
  3. Separate incompatible materials according to the segregation requirements Correct answer.
  4. Load the oxidizer directly against the corrosive drums

Explanation

Incompatible hazardous materials must be segregated to prevent dangerous reactions if a release occurs. Corrosives and oxidizers can react, so the segregation rules must be followed.

Question 19Hazardous materials regulations, definitions, and operational requirements (49 CFR Parts 171-180; HM endorsement rules)

A driver holds a hazmat endorsement and is offered a load of a material requiring a placard. What must be true about the vehicle before the driver accepts the load?

  1. The vehicle must have a sleeper berth
  2. The vehicle must have a GPS tracking device
  3. The vehicle must display the required placards for the material Correct answer.
  4. The vehicle must be less than five years old

Explanation

Placards must be displayed on the vehicle for the hazardous materials being transported, as required by the placarding tables. Vehicle age, sleeper berths, and tracking devices are not placarding conditions.

Question 20Hazardous materials regulations, definitions, and operational requirements (49 CFR Parts 171-180; HM endorsement rules)

A driver with a hazmat endorsement is asked to transport a material that requires a hazard class label on each package. Who is responsible for ensuring the labels are applied?

  1. The driver, after loading
  2. The receiver, upon delivery
  3. The mechanic, during inspection
  4. The shipper, before offering the package for transport Correct answer.

Explanation

The shipper must mark and label packages before offering them for transport, and the driver should verify labels are present. The driver does not create the labels, and the receiver has no labeling duty.

Question 21Hazardous materials regulations, definitions, and operational requirements (49 CFR Parts 171-180; HM endorsement rules)

A driver is transporting a placarded quantity of a Class 3 flammable liquid. Which statement about smoking is correct?

  1. Smoking is allowed if the driver is outside the vehicle
  2. Smoking is prohibited in the vehicle and within a specified distance of it Correct answer.
  3. Smoking is allowed only during loading
  4. Smoking is allowed if the windows are open

Explanation

Smoking is prohibited in and near vehicles carrying flammable materials, and the regulations specify a distance from the vehicle. Open windows or being outside the cab do not create an exception.

Question 22Hazardous materials regulations, definitions, and operational requirements (49 CFR Parts 171-180; HM endorsement rules)

A driver is transporting a hazardous material and must cross a weigh station. The officer asks to see the shipping papers. What must the driver provide?

  1. The shipping papers with the required hazardous materials description Correct answer.
  2. Only the driver's license
  3. A verbal description of the cargo
  4. The vehicle registration only

Explanation

Enforcement officers may inspect shipping papers, which must contain the required hazardous materials description. A verbal description or license alone does not satisfy the inspection.

Question 23Hazardous materials regulations, definitions, and operational requirements (49 CFR Parts 171-180; HM endorsement rules)

A driver is hauling a load of a Division 4.1 flammable solid. Which hazard does this division describe?

  1. A readily combustible solid Correct answer.
  2. A corrosive liquid
  3. An infectious substance
  4. A toxic gas

Explanation

Division 4.1 covers flammable solids that ignite readily or may cause fire through friction. Corrosive liquids are Class 8, toxic gases are Division 2.3, and infectious substances are Division 6.2.

Question 24Hazardous materials regulations, definitions, and operational requirements (49 CFR Parts 171-180; HM endorsement rules)

A driver with a hazmat endorsement is asked to transport a material requiring a POISON label. Which precaution is most consistent with the regulations?

  1. Open the packages to verify contents
  2. Load the material next to food products for convenience
  3. Keep the material separated from food and ensure the packages remain closed Correct answer.
  4. Remove the labels to avoid public concern

Explanation

Poison-labeled materials must be kept away from food and kept closed to prevent contamination. Opening packages or removing labels violates handling and labeling rules.

Question 25Hazardous materials regulations, definitions, and operational requirements (49 CFR Parts 171-180; HM endorsement rules)

A driver is preparing to transport a hazardous material and must ensure the vehicle has the required emergency equipment. Which item is part of the required equipment for a placarded load?

  1. A reflective vest for the driver
  2. A flashlight with extra batteries
  3. A spare tire for the trailer
  4. A fire extinguisher of the required type and size Correct answer.

Explanation

Vehicles carrying placarded hazardous materials must carry a fire extinguisher meeting the required rating, along with other specified equipment. Spare tires, flashlights, and vests are not the regulatory hazmat equipment item.

Question 26Hazardous materials regulations, definitions, and operational requirements (49 CFR Parts 171-180; HM endorsement rules)

Under the HM endorsement rules, a driver must be at least how old to operate a commercial motor vehicle in interstate commerce while transporting hazardous materials requiring placarding?

  1. 23 years old
  2. 21 years old Correct answer.
  3. 18 years old
  4. 25 years old

Explanation

Drivers operating commercial motor vehicles in interstate commerce, including placarded hazmat loads, must meet the federal minimum age of 21. The 18-year threshold applies only to intrastate operations within a state that allows it.

Question 27Hazardous materials regulations, definitions, and operational requirements (49 CFR Parts 171-180; HM endorsement rules)

A driver is reviewing the hazard class definitions before loading. Which class covers materials that cause a severe caustic burn to skin or corrode steel?

  1. Class 5 (Oxidizer)
  2. Class 6 (Toxic)
  3. Class 8 (Corrosive) Correct answer.
  4. Class 9 (Miscellaneous)

Explanation

Class 8 is assigned to corrosive materials, defined as substances that cause full-thickness destruction of skin tissue or that corrode steel or aluminum at a specified rate. Oxidizers, toxic materials, and miscellaneous hazards are classified under Classes 5, 6, and 9 respectively.

Question 28Hazardous materials regulations, definitions, and operational requirements (49 CFR Parts 171-180; HM endorsement rules)

A driver is assigned to pull a highway route controlled quantity of a Class 7 radioactive material. Which requirement applies to this shipment?

  1. The driver must follow the routing and pre-trip planning requirements that apply to radioactive materials in this quantity Correct answer.
  2. The driver may stop for rest at any location without restriction
  3. The driver may use any direct highway route as long as the load is placarded
  4. The driver needs only a standard CDL with no additional endorsement

Explanation

Highway route controlled quantities of radioactive material are subject to specific routing rules, including carrier and driver planning of the route and compliance with designated preferred routes. These shipments also require a hazmat endorsement and careful attention to parking and security, so generic routing or unrestricted stops are not permitted.

Question 29Hazardous materials regulations, definitions, and operational requirements (49 CFR Parts 171-180; HM endorsement rules)

A driver is transporting a hazardous material and must decide where to place the required emergency response telephone number. Where does the regulation require it to appear?

  1. Verbally provided to the shipper only
  2. On the shipping paper, entered in the space provided after the emergency response information Correct answer.
  3. On the outside of the vehicle near the placard
  4. On a separate card kept in the driver's wallet

Explanation

The emergency response telephone number must be entered on the shipping paper in the designated area, and it must be monitored at all times the material is in transportation. A number kept elsewhere or given only verbally does not satisfy the requirement.

Question 30Hazardous materials regulations, definitions, and operational requirements (49 CFR Parts 171-180; HM endorsement rules)

A driver is preparing to load a cargo tank with a material that requires a hazmat endorsement. Which statement about the driver's qualification file is correct?

  1. The file must be updated every five years regardless of endorsement status
  2. The file must contain the driver's hazmat endorsement and current security threat assessment results Correct answer.
  3. The file may be maintained only at the driver's home
  4. The file needs only a copy of the driver's CDL

Explanation

A driver hauling hazardous materials requiring placarding must hold a hazmat endorsement supported by a valid security threat assessment, and the qualification file must document that endorsement and assessment. A CDL alone or a file kept at home does not meet the carrier's recordkeeping obligation.

Question 31Hazard communication: shipping papers, placarding, marking, labels, and emergency response information

Under the hazardous materials regulations, who is responsible for providing the emergency response telephone number on a shipping paper?

  1. The mechanic who performs the pre-trip inspection
  2. The driver who operates the vehicle during transit
  3. The shipper who offers the hazardous material for transportation Correct answer.
  4. The receiver who signs for the load at destination

Explanation

The person offering a hazardous material for transportation must prepare the shipping paper, and that includes entering a emergency response telephone number that is monitored at all times the material is in transportation. The driver must ensure the paperwork is present but does not create the number.

Question 32Hazard communication: shipping papers, placarding, marking, labels, and emergency response information

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

  1. UN identification number, proper shipping name, hazard class, packing group Correct answer.
  2. Proper shipping name, packing group, UN identification number, hazard class
  3. Hazard class, packing group, UN identification number, proper shipping name
  4. Packing group, hazard class, proper shipping name, UN identification number

Explanation

The basic description on a shipping paper follows the order: identification number, proper shipping name, hazard class or division, and subsidiary hazard if any, followed by the packing group. Getting the sequence right matters because inspectors and emergency responders read the entry in that order.

Question 33Hazard communication: shipping papers, placarding, marking, labels, and emergency response information

Unless a specific exception applies, how long must a carrier retain hazardous materials shipping papers after the material has been delivered?

  1. 6 months
  2. 2 years Correct answer.
  3. 90 days
  4. 5 years

Explanation

The hazardous materials regulations require shipping papers to be kept for two years after the material is accepted by the initial carrier. The retention period supports later audits and incident investigations.

Question 34Hazard communication: shipping papers, placarding, marking, labels, and emergency response information

When a shipping paper covers both hazardous and non-hazardous materials, how must the hazardous materials entries be distinguished?

  1. They must be written in a separate envelope kept in the cab
  2. They must be listed first, or highlighted by a contrasting color or other approved method Correct answer.
  3. They must be printed on a different size of paper than the rest of the document
  4. They must be signed by the driver in the margin next to each line

Explanation

Hazardous materials entries on a mixed shipping paper must be identifiable, either by listing them first or by using a contrasting color or other approved means such as an X in a designated column. This lets responders find the hazardous entries quickly in an emergency.

Question 35Hazard communication: shipping papers, placarding, marking, labels, and emergency response information

A driver is hauling a load that requires placards. Where must the shipping papers be kept while the vehicle is moving?

  1. In a pouch on the driver's door or in clear view within reach while the driver is belted Correct answer.
  2. Stored in the sleeper berth under the mattress
  3. Locked in the trailer with the cargo
  4. Mailed to the consignee in advance

Explanation

Shipping papers for a placarded load must be kept in a pouch on the driver's door or in clear view within the driver's reach while restrained. This placement lets the driver hand them to emergency responders without leaving the seat.

Question 36Hazard communication: shipping papers, placarding, marking, labels, and emergency response information

What information must appear on the emergency response telephone number entry so that it is valid?

  1. The carrier's dispatch number that is answered only on weekdays
  2. A number monitored at all times during transportation, with the person or agency identified Correct answer.
  3. The shipper's home phone number as a backup only
  4. Any number where a voicemail can be left overnight

Explanation

The emergency response number must be one that is monitored at all times while the material is in transportation, and the entry must identify the person or agency that can provide response information. Numbers that are unanswered after hours do not satisfy the requirement.

Question 37Hazard communication: shipping papers, placarding, marking, labels, and emergency response information

Which document is acceptable as emergency response information carried with a hazardous materials shipment?

  1. A business card from the consignee's office
  2. A blank bill of lading from a previous load
  3. A handwritten note listing only the destination city
  4. The emergency response information sheet required by the regulations, kept with the shipping paper Correct answer.

Explanation

Emergency response information must be carried with the shipping paper and must include the basic description, immediate hazards, and initial fire and spill response guidance. It can be a separate sheet or incorporated into the shipping document.

Question 38Hazard communication: shipping papers, placarding, marking, labels, and emergency response information

A driver discovers the emergency response information sheet is missing from a placarded load. What is the correct action?

  1. Proceed only if the trip is shorter than 50 miles
  2. Proceed and write the response steps from memory on a napkin
  3. Do not move the shipment until the required emergency response information is obtained Correct answer.
  4. Proceed because placards alone satisfy the requirement

Explanation

Emergency response information is a required part of the shipping documentation for hazardous materials, so the shipment should not move without it. Placards communicate hazard class but do not replace response guidance.

Question 39Hazard communication: shipping papers, placarding, marking, labels, and emergency response information

Which hazard class placard is required for a material classed as Division 1.1?

  1. OXIDIZER 1.1
  2. FLAMMABLE 1.1
  3. CORROSIVE 1.1
  4. EXPLOSIVES 1.1 Correct answer.

Explanation

Division 1.1 materials are in Class 1, Explosives, and the placard reads EXPLOSIVES 1.1 with the appropriate compatibility group letter where required. The division number appears on the placard to tell responders the specific explosive hazard.

Question 40Hazard communication: shipping papers, placarding, marking, labels, and emergency response information

A vehicle carries 2,500 pounds of a Class 3 flammable liquid in non-bulk packages. What placarding is required?

  1. A placard only when the material is loaded in bulk
  2. A placard only on the rear of the trailer
  3. No placard because the load is under 5,000 pounds
  4. FLAMMABLE placard on both sides and both ends of the vehicle Correct answer.

Explanation

For most hazard classes, the placard threshold for non-bulk packages is 1,001 pounds aggregate gross weight, so 2,500 pounds exceeds the threshold. Placards must be displayed on both sides and both ends of the transport vehicle.

Question 41Hazard communication: shipping papers, placarding, marking, labels, and emergency response information

When may a DANGEROUS placard be used instead of the specific hazard class placard?

  1. Only when the material is in a bulk tank
  2. When the load contains two or more categories of hazardous materials that require different placards and the quantity rules permit Correct answer.
  3. Only when the shipment weighs less than 1,001 pounds
  4. Whenever the driver prefers not to display the specific class

Explanation

The DANGEROUS placard is an option for loads containing two or more hazard categories that would otherwise require different placards, subject to quantity limits in the placarding tables. It is not a general substitute for a single-class load.

Question 42Hazard communication: shipping papers, placarding, marking, labels, and emergency response information

Where must placards be displayed on a cargo tank vehicle?

  1. On the front bumper only
  2. On both sides and both ends of the vehicle Correct answer.
  3. Only on the rear
  4. Only on the driver's side

Explanation

Placards must be displayed on both sides and both ends of the transport vehicle so the hazard is visible from any approach direction. Emergency responders may arrive from either direction and need to identify the hazard quickly.

Question 43Hazard communication: shipping papers, placarding, marking, labels, and emergency response information

A placarded vehicle is parked overnight at a truck stop. What does the regulation require regarding placards?

  1. Placards remain displayed; they are removed only when the vehicle no longer contains the hazardous material Correct answer.
  2. Placards must be covered with opaque tape whenever the driver sleeps
  3. Placards must be removed every time the vehicle stops for more than one hour
  4. Placards must be moved to the inside of the windshield at night

Explanation

Placards stay on the vehicle as long as it contains the hazardous material, including during stops and overnight parking. Removing or covering them would hide the hazard from responders approaching the parked vehicle.

Question 44Hazard communication: shipping papers, placarding, marking, labels, and emergency response information

What does the four-digit UN identification number on a placard or orange panel tell an emergency responder?

  1. The date the material was manufactured
  2. The specific hazardous material, which can be looked up in the emergency response guide Correct answer.
  3. The total weight of the shipment
  4. The driver's license class required to haul it

Explanation

The four-digit identification number identifies the specific material so responders can look it up in the Emergency Response Guidebook and find the correct guide page. It is not a weight, date, or licensing code.

Question 45Hazard communication: shipping papers, placarding, marking, labels, and emergency response information

When is an orange panel displaying the UN identification number required instead of the number printed on the placard itself?

  1. Only when the vehicle crosses a state line
  2. When the placard design does not include the identification number and the material requires one Correct answer.
  3. Whenever the driver wants additional signage
  4. Only when the material is non-hazardous

Explanation

If the required placard does not already display the identification number, an orange panel or a white square-on-point configuration bearing the number must be used. The number must be visible so responders can identify the material.

Question 46Hazard communication: shipping papers, placarding, marking, labels, and emergency response information

A non-bulk package of a hazardous material must bear which markings, in addition to the proper shipping name and identification number?

  1. The route map reference number
  2. The consignee's or consignor's name and address, unless the package is excepted Correct answer.
  3. The vehicle's license plate number
  4. The driver's home terminal code

Explanation

Non-bulk packages must be marked with the proper shipping name and identification number, and with the name and address of the consignor or consignee unless an exception applies. These markings tie the package to its shipping documentation.

Question 47Hazard communication: shipping papers, placarding, marking, labels, and emergency response information

A package bears a FLAMMABLE LIQUID label. What does this label communicate to handlers?

  1. The package contains an infectious substance
  2. The package contains a radioactive material
  3. The package contains a liquid that gives off flammable vapors and must be kept away from ignition sources Correct answer.
  4. The package contains a compressed gas under pressure

Explanation

The FLAMMABLE LIQUID label identifies a Class 3 material whose vapors can ignite, so handlers keep it away from heat, sparks, and open flame. It does not indicate gas, infectious, or radioactive hazards.

Question 48Hazard communication: shipping papers, placarding, marking, labels, and emergency response information

Which label is required on a package of a Class 8 material?

  1. FLAMMABLE SOLID
  2. MAGNETIZED
  3. CORROSIVE Correct answer.
  4. POISON

Explanation

Class 8 materials are corrosives, and packages bear the CORROSIVE label showing the damage the material can do to skin and metal. The other labels correspond to different hazard classes.

Question 49Hazard communication: shipping papers, placarding, marking, labels, and emergency response information

A driver is given a package with a damaged hazard label that is no longer legible. What should the driver do?

  1. Refuse to accept the package until the label is replaced with a legible one Correct answer.
  2. Accept it and note the damage on the bill of lading only
  3. Accept it because labels are optional once the package is loaded
  4. Accept it and cover the label with tape

Explanation

A package with a missing or illegible hazard label does not meet marking and labeling requirements, and the driver should not accept it for transport until it is corrected. A note on the paperwork does not cure the defect.

Question 50Hazard communication: shipping papers, placarding, marking, labels, and emergency response information

For a shipment of a Division 6.1 PG I inhalation hazard, which additional marking is required on the package?

  1. A FLAMMABLE GAS label
  2. A CORROSIVE label
  3. An OXIDIZER label
  4. The POISON INHALATION HAZARD marking in addition to the POISON label Correct answer.

Explanation

Materials that are toxic by inhalation in Packing Group I require the POISON INHALATION HAZARD marking along with the POISON label. This alerts responders to the inhalation risk, which drives different protective actions.