I85PREP
⌘ K
Louisiana CDL Hazmat study materials
Louisiana CDL Hazmat study resources

Louisiana CDL Hazmat practice questions

One question at a time. Build your Louisiana CDL Hazmat 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, communication rules, and incident reporting

Under the Hazardous Materials Regulations, which shipping paper entry correctly shows a basic description for a non-bulk package of flammable liquid?

  1. UN1993 PG II Flammable liquid 3
  2. UN1993, Flammable liquid, n.o.s. (Ethanol), 3, PG II Correct answer.
  3. Flammable liquid 3, PG II, UN1993
  4. Flammable liquid, UN1993, PG II, 3

Explanation

The basic description sequence must appear in order: UN identification number, proper shipping name, hazard class or division, and subsidiary hazard (if any), then packing group. Parenthetical technical names follow the proper shipping name when the entry is an n.o.s. generic name. Deviating from the sequence makes the entry improper.

Question 2Hazardous materials regulations, communication rules, and incident reporting

A driver is hauling a loaded tank trailer of gasoline. Which placarding requirement applies to the vehicle?

  1. Placards on both sides and both ends of the vehicle Correct answer.
  2. No placards are required if the manifest is aboard
  3. Placards on both sides and the rear only
  4. One placard on each side of the vehicle

Explanation

For bulk packages and for shipments requiring placards, the placards must be displayed on both sides and both ends of the motor vehicle. Gasoline is a flammable liquid requiring placarding, so all four positions are needed. Placarding is a communication requirement independent of the shipping paper.

Question 3Hazardous materials regulations, communication rules, and incident reporting

Which hazard class is represented by a placard bearing the word EXPLOSIVES and a division number?

  1. Class 1 Correct answer.
  2. Class 3
  3. Class 8
  4. Class 5

Explanation

Explosives fall under Class 1 and are subdivided into divisions 1.1 through 1.6. Class 3 covers flammable liquids, Class 5 covers oxidizers and organic peroxides, and Class 8 covers corrosives. The division number on the placard identifies the specific explosive hazard.

Question 4Hazardous materials regulations, communication rules, and incident reporting

A driver is involved in a crash that results in a release of a hazardous material. Which reporting obligation applies?

  1. The carrier must immediately notify the National Response Center Correct answer.
  2. A written report is due to the state police within 30 days
  3. The driver only needs to notify the shipper by mail
  4. No report is required if the release is under one gallon

Explanation

The Hazardous Materials Regulations require immediate notice to the National Response Center when a release occurs in an incident involving hazardous materials. The carrier is responsible for making the call, and a written follow-up report is also required. Volume thresholds do not eliminate the duty to report.

Question 5Hazardous materials regulations, communication rules, and incident reporting

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

  1. To record the vehicle's maintenance history
  2. To guide response actions during an incident involving the material Correct answer.
  3. To document the driver's hours of service
  4. To list the shipper's billing address

Explanation

Emergency response information tells responders what to do if the material is released or involved in a fire, including protective actions and first aid. It must be immediately available to the driver and carried with the shipping paper. Billing, hours of service, and maintenance records serve unrelated purposes.

Question 6Hazardous materials regulations, communication rules, and incident reporting

A shipping paper lists a hazardous material with an RQ notation. What does this indicate?

  1. The material is exempt from placarding
  2. The material requires refrigeration
  3. The material meets a reportable quantity threshold for a hazardous substance Correct answer.
  4. The material is radioactive

Explanation

RQ stands for reportable quantity and appears when a shipment contains a hazardous substance in an amount equal to or greater than its reportable quantity. Releases of such materials may trigger additional notification duties. It has no connection to radioactivity, refrigeration, or placarding exemptions.

Question 7Hazardous materials regulations, communication rules, and incident reporting

Which document must a hazmat driver keep within arm's reach while operating the vehicle?

  1. The shipping paper Correct answer.
  2. The insurance certificate
  3. The vehicle registration
  4. The bill of lading for prior loads

Explanation

The shipping paper must be readily accessible to the driver while behind the wheel, and it must be kept in a holder mounted in the cab or otherwise within reach. This allows quick access by emergency responders. Other documents do not carry the same regulatory placement requirement.

Question 8Hazardous materials regulations, communication rules, and incident reporting

A driver transports a package marked with the inhalation hazard symbol. What additional shipping paper notation is required?

  1. The word Refrigerated
  2. The words Poison-Inhalation Hazard or Toxic-Inhalation Hazard Correct answer.
  3. The word Fragile
  4. The words This End Up

Explanation

Materials meeting inhalation hazard criteria must be identified on the shipping paper with the words Poison-Inhalation Hazard or Toxic-Inhalation Hazard, along with the hazard zone. This alerts responders to the severe inhalation risk. Handling markings such as Fragile or This End Up do not satisfy this requirement.

Question 9Hazardous materials regulations, communication rules, and incident reporting

A vehicle carrying a hazardous material must display placards. Where may the required front placard be placed?

  1. Only on the trailer's rear doors
  2. On the front of the vehicle, visible from the front Correct answer.
  3. Only on the driver's side door
  4. Inside the cab on the dashboard

Explanation

Placards must be displayed on both ends and both sides of the vehicle, with the front placard visible from the front. Placing it inside the cab or only on one surface does not meet the visibility requirement. Emergency responders approaching from any direction must be able to identify the hazard.

Question 10Hazardous materials regulations, communication rules, and incident reporting

A shipping paper entry includes the packing group III. What does the packing group indicate?

  1. The country of origin
  2. The expiration date of the material
  3. The degree of danger presented by the material Correct answer.
  4. The weight of the package

Explanation

Packing groups classify materials by degree of danger: I for great danger, II for medium danger, and III for minor danger. The assignment guides packaging selection and handling precautions. It does not convey weight, expiration, or origin information.

Question 11Hazardous materials regulations, communication rules, and incident reporting

Which agency administers the Hazardous Materials Regulations that govern CDL hazmat drivers in interstate commerce?

  1. National Transportation Safety Board (NTSB)
  2. Federal Motor Carrier Safety Administration (FMCSA)
  3. Occupational Safety and Health Administration (OSHA)
  4. Pipeline and Hazardous Materials Safety Administration (PHMSA) Correct answer.

Explanation

PHMSA, within the U.S. Department of Transportation, issues and administers the Hazardous Materials Regulations in 49 CFR Parts 100 through 185. FMCSA handles driver qualifications and hours of service, while NTSB investigates accidents and OSHA covers workplace safety. Knowing the administering agency helps drivers locate the correct rule source.

Question 12Hazardous materials regulations, communication rules, and incident reporting

A driver discovers that a placard on the vehicle is missing. What is the appropriate action before continuing the trip?

  1. Note the missing placard on the shipping paper
  2. Replace the missing placard before moving the vehicle Correct answer.
  3. Reduce speed and proceed without the placard
  4. Continue the trip and replace it at the destination

Explanation

Placards are a required communication tool, and a vehicle may not be operated with required placards missing. The driver should obtain and affix a replacement before continuing. Documenting the deficiency or slowing down does not cure the violation.

Question 13Hazardous materials regulations, communication rules, and incident reporting

What information must appear on a hazardous materials shipping paper in addition to the basic description?

  1. The vehicle's tire pressure
  2. The total quantity and the number and type of packages Correct answer.
  3. The driver's home address
  4. The shipper's tax identification number

Explanation

A shipping paper must show the basic description plus the total quantity of the material and the number and type of packages. These details let responders estimate the scale of a release. Personal, mechanical, and tax data are not part of the required hazmat description.

Question 14Hazardous materials regulations, communication rules, and incident reporting

A driver is hauling a material requiring the CORROSIVE placard. Which hazard class does this correspond to?

  1. Class 2
  2. Class 4
  3. Class 6
  4. Class 8 Correct answer.

Explanation

Corrosive materials are Class 8 and include substances that cause visible destruction of skin or corrode steel or aluminum. Class 6 covers toxic and infectious substances, Class 4 covers flammable solids, and Class 2 covers gases. Correctly associating the placard with its class supports quick hazard recognition.

Question 15Hazardous materials regulations, communication rules, and incident reporting

When must a carrier submit a written hazardous materials incident report?

  1. Within 24 hours of the incident
  2. Within 30 days of discovering the incident Correct answer.
  3. Within 7 days of the incident
  4. Only if requested by the shipper

Explanation

After immediate telephone notice to the National Response Center, the carrier must submit a written incident report to the appropriate federal agency within 30 days. The written report documents the circumstances, injuries, and release details. Waiting for a shipper request is not permitted.

Question 16Hazardous materials regulations, communication rules, and incident reporting

A driver must transport a hazardous material that requires a placard but the vehicle has no placard holder on one side. What is the best practice?

  1. Tape the placard to the inside of the windshield
  2. Skip that side and rely on the other three placards
  3. Affix the placard securely to the vehicle surface so it is visible Correct answer.
  4. Carry the placard in the cab and display it on request

Explanation

Placards must be securely affixed and visible from the required positions. If a holder is unavailable, the placard may be attached directly to the vehicle surface. Interior placement or carrying it unused fails the visibility requirement.

Question 17Hazardous materials regulations, communication rules, and incident reporting

Which notation on a shipping paper indicates that a material is hazardous when transported by water but not regulated for highway transport?

  1. PG I
  2. No such notation exists; the HMR governs highway transport Correct answer.
  3. Marine pollutant only
  4. RQ

Explanation

The Hazardous Materials Regulations govern highway transportation, and a material regulated for water may still be regulated on land depending on its characteristics. Drivers should rely on the shipping description prepared under the HMR rather than assuming a marine-only designation. When in doubt, the carrier should verify with the shipper.

Question 18Hazardous materials regulations, communication rules, and incident reporting

A driver notices that the shipping paper description omits the hazard class. What should the driver do?

  1. Cover the omission with a placard
  2. Proceed and inform the receiver at delivery
  3. Add the hazard class by hand and proceed
  4. Refuse to accept the shipment until the description is corrected Correct answer.

Explanation

A shipping paper missing a required element of the basic description is not in compliance, and the driver should not accept the shipment until it is corrected. Handwritten additions by the driver are not an acceptable substitute for a proper shipper-prepared description. Placards do not correct a deficient shipping paper.

Question 19Hazardous materials regulations, communication rules, and incident reporting

What is the purpose of the hazard zone designation A, B, C, or D on a shipping paper?

  1. It indicates the package size category
  2. It identifies the shipper's facility zone
  3. It shows the route restriction level
  4. It ranks inhalation toxicity for gases and volatile liquids Correct answer.

Explanation

Hazard zones A through D indicate the degree of inhalation hazard for materials that are toxic by inhalation, with A representing the greatest hazard. The zone helps responders select protective actions. It does not describe package size, routing, or facility layout.

Question 20Hazardous materials regulations, communication rules, and incident reporting

A driver is asked to move a trailer that has been loaded with a hazardous material but has no shipping paper yet. What is the correct response?

  1. Move the trailer if the placards are already on
  2. Move the trailer only if the load is under 1,000 pounds
  3. Move the trailer and obtain the paper en route
  4. Do not move the trailer until a proper shipping paper is provided Correct answer.

Explanation

A hazardous materials shipment may not be transported without the required shipping paper. The driver should wait until the shipper provides a compliant description. Placards alone do not substitute, and weight thresholds do not waive the requirement.

Question 21Hazardous materials regulations, communication rules, and incident reporting

Which placard would be used for a material classified as a flammable gas?

  1. CORROSIVE
  2. OXIDIZER
  3. FLAMMABLE GAS Correct answer.
  4. FLAMMABLE LIQUID

Explanation

Flammable gases fall under Class 2, Division 2.1, and use the FLAMMABLE GAS placard. Flammable liquids use a separate Class 3 placard, oxidizers use Class 5.1, and corrosives use Class 8. Matching the placard to the class prevents miscommunication to responders.

Question 22Hazardous materials regulations, communication rules, and incident reporting

A driver is involved in an incident where a small quantity of a hazardous material leaks but no one is injured. Which statement best describes the reporting duty?

  1. Report only at the end of the month
  2. Report only if the leak exceeds 55 gallons
  3. Report immediately if the release meets the reportable quantity or other criteria Correct answer.
  4. Never report small leaks

Explanation

Reporting is triggered by criteria such as a release of a reportable quantity, a fire, an evacuation, or certain injuries, not simply by the size of the spill in gallons. A small leak of a highly hazardous material can still require immediate notice. Drivers should follow the shipping paper and emergency response information to determine the duty.

Question 23Hazardous materials regulations, communication rules, and incident reporting

What must a driver do with the shipping paper after delivering a hazardous materials load?

  1. Retain it as required by the carrier's recordkeeping obligations Correct answer.
  2. Mail it to the shipper within 24 hours
  3. Leave it with the receiver and keep no copy
  4. Destroy it immediately after unloading

Explanation

Shipping papers must be retained for a specified period under the recordkeeping rules, and the carrier is responsible for keeping them available for inspection. Discarding them immediately or leaving no copy can violate those obligations. The retention period is defined in the regulations.

Question 24Hazardous materials regulations, communication rules, and incident reporting

A driver hauling a placarded load approaches a railroad crossing. Which action is required?

  1. Stop only if a train is visible
  2. Sound the horn and proceed
  3. Stop before the crossing and check for an approaching train Correct answer.
  4. Slow down but continue without stopping

Explanation

Vehicles carrying hazardous materials that require placards must stop before railroad crossings and check for approaching trains before proceeding. This rule reduces the risk of a catastrophic collision with a train. Slowing or sounding the horn does not satisfy the stop requirement.

Question 25Hazardous materials regulations, communication rules, and incident reporting

Which factor determines whether a hazardous materials load requires placarding?

  1. The hazard class and quantity thresholds in the placarding table Correct answer.
  2. The color of the vehicle
  3. The driver's years of experience
  4. The distance of the trip

Explanation

Placarding is determined by the hazard class of the material and the quantity thresholds listed in the placarding table. Experience, trip distance, and vehicle color play no role. Drivers should consult the table for the specific material and quantity.

Question 26Hazardous materials regulations, communication rules, and incident reporting

Under the Hazardous Materials Regulations, a driver is required to carry emergency response information for a placarded shipment. Which arrangement satisfies this requirement while the vehicle is in motion?

  1. Emergency response information posted at the carrier's terminal office
  2. Emergency response information mailed to the consignee in advance
  3. Emergency response information stored in the trailer with the cargo
  4. Emergency response information kept in the cab within immediate reach of the driver Correct answer.

Explanation

Emergency response information must accompany a hazardous materials shipment and be immediately available to the driver during transport, so it is normally kept in the cab within reach. Keeping it in the trailer or at a terminal location does not make it available at the scene of an emergency. Advance mailing to the consignee does not satisfy the requirement for the vehicle in transit.

Question 27Hazardous materials regulations, communication rules, and incident reporting

A driver is reviewing a shipping paper and sees the entry includes an emergency response telephone number. What is the regulatory purpose of that number?

  1. It is the consignee's billing contact for freight charges
  2. It is the number used to schedule the delivery appointment
  3. It is the carrier's dispatch line for routine check-ins
  4. It is the number the driver calls to obtain information in a hazardous materials emergency Correct answer.

Explanation

The emergency response telephone number on a shipping paper must be monitored at all times during transport and must be a source of emergency response information. It is not a billing, scheduling, or dispatch contact. A driver or responder can call it to get guidance about the material involved.

Question 28Hazardous materials regulations, communication rules, and incident reporting

A driver must know the hazard communication requirements for a bulk package of a hazardous material. Which statement describes when placards are required on the vehicle?

  1. Only when the trip crosses a state line
  2. When the quantity of the material in the vehicle exceeds the placarding threshold for its hazard class Correct answer.
  3. Only when the material is loaded by the shipper rather than the driver
  4. Whenever any amount of a hazardous material is aboard, regardless of class

Explanation

Placarding is generally driven by the hazard class of the material and the quantity in the vehicle, using the placarding tables in the regulations. Some classes require placards for any quantity, while others use a 1,001-pound threshold. Who loaded the material and whether the trip is intrastate do not control the placarding decision.

Question 29Hazardous materials regulations, communication rules, and incident reporting

A driver is inspecting a vehicle before a placarded trip and checks the placards. Which condition makes a placard unacceptable for use?

  1. The placard is faded and the hazard class number can no longer be read Correct answer.
  2. The placard is clean and free of dirt buildup
  3. The placard shows the correct four-digit identification number
  4. The placard is mounted on a holder at the required height

Explanation

Placards must be legible and must display the required hazard class and identification number information. A faded placard whose number cannot be read fails that requirement and must be replaced before the vehicle moves. Clean, correctly mounted placards showing the right number are acceptable.

Question 30Hazardous materials regulations, communication rules, and incident reporting

A driver is hauling a shipment of a hazardous material and must determine whether the shipment requires placards. The shipping paper shows a hazard class subject to the 1,001-pound placarding threshold, and the vehicle carries 1,500 pounds of that material. What is the correct action?

  1. Placard the vehicle for that hazard class on both sides and both ends Correct answer.
  2. Do not placard because the load is below the 5,000-pound bulk threshold
  3. Placard only when the material is loaded in a bulk packaging
  4. Placard only the rear of the vehicle because the load is under 2,000 pounds

Explanation

For hazard classes subject to the 1,001-pound threshold, a quantity of 1,500 pounds exceeds the threshold and the vehicle must be placarded. Placards are placed on both sides and both ends of the vehicle. The 5,000-pound figure and the bulk packaging rule address different situations and do not exempt this load.

Question 31Hazardous materials regulations, communication rules, and incident reporting

A driver is completing paperwork for a hazardous materials shipment and must ensure the shipping paper is properly prepared. Which element is part of the basic description required on a shipping paper?

  1. The vehicle's license plate number
  2. The consignee's telephone number
  3. The driver's license number
  4. The hazard class of the material Correct answer.

Explanation

The basic description on a shipping paper includes the proper shipping name, hazard class, and identification number, in that order, along with the total quantity. Consignee phone numbers, driver license numbers, and plate numbers are not part of the basic description. Including the hazard class is mandatory.

Question 32Hazardous materials regulations, communication rules, and incident reporting

A driver picks up a load and notices the shipping paper lists the proper shipping name and identification number but omits the hazard class. What is the correct course of action?

  1. Add the hazard class to the shipping paper in the driver's own handwriting
  2. Proceed because the identification number implies the hazard class
  3. Proceed and note the omission on the delivery receipt at destination
  4. Refuse to move the load until the shipper corrects the shipping paper Correct answer.

Explanation

A shipping paper missing a required basic description element is not properly prepared, and the driver should not accept the shipment until it is corrected. The driver is not authorized to create or alter the shipper's hazard communication information. Relying on the identification number or noting the gap later does not fix the deficiency before transport.

Question 33Hazardous materials regulations, communication rules, and incident reporting

A driver is reviewing a shipping paper and sees a notation that the material is a hazardous substance with an RQ. What does the RQ value represent?

  1. The reportable quantity that triggers a release reporting obligation Correct answer.
  2. The quantity above which placards are always required
  3. The quantity the shipper must discount from the invoice
  4. The maximum quantity the vehicle may legally carry

Explanation

RQ stands for reportable quantity, the threshold amount of a hazardous substance that, if released, triggers reporting requirements under environmental law. It is not a carrying limit, a placarding trigger, or a commercial discount figure. The notation alerts the driver that a release may need to be reported.

Question 34Hazardous materials regulations, communication rules, and incident reporting

A driver is hauling a material that requires the FLAMMABLE placard. Which hazard class does that placard correspond to?

  1. Class 9
  2. Class 3 Correct answer.
  3. Class 5
  4. Class 8

Explanation

The FLAMMABLE placard is used for Class 3 flammable and combustible liquids. Class 5 covers oxidizers and organic peroxides, Class 8 covers corrosives, and Class 9 covers miscellaneous hazardous materials. Matching the placard to the class is part of the driver's hazard communication responsibility.

Question 35Hazardous materials regulations, communication rules, and incident reporting

A driver is involved in an incident in which a hazardous material is released during transport. Which condition generally triggers the requirement to report the incident to the National Response Center?

  1. The release leaves a visible stain on the roadway
  2. The release meets the reportable quantity for that material Correct answer.
  3. The load is being delivered to a different state
  4. The vehicle is delayed more than one hour

Explanation

Releases of hazardous substances that meet or exceed the reportable quantity must be reported to the National Response Center. Visible staining, delays, or crossing state lines are not the regulatory triggers. The reporting obligation is tied to the quantity and nature of the release.

Question 36Hazardous materials regulations, communication rules, and incident reporting

A driver is preparing to load a hazardous material and checks the compatibility of the cargo. Which factor determines whether two hazardous materials may be loaded together in the same vehicle?

  1. The hazard classes and compatibility requirements for the materials involved Correct answer.
  2. The total weight of the combined load
  3. The color of the packaging used for each material
  4. The number of stops on the delivery route

Explanation

Segregation rules are based on hazard class and the compatibility of the materials, which is why the shipping paper and segregation table matter. Weight, route stops, and packaging color do not determine loading compatibility. Loading incompatible materials together can create a serious hazard.

Question 37Hazardous materials regulations, communication rules, and incident reporting

A driver is transporting a hazardous material and must decide how to handle the shipping paper during a rest stop. Which practice meets the requirement that the shipping paper be accessible?

  1. Keep the shipping paper in the cab where it can be reached immediately Correct answer.
  2. Lock the shipping paper in the sleeper berth storage compartment
  3. Store the shipping paper in the carrier's office until delivery
  4. Leave the shipping paper in the trailer with the freight

Explanation

The shipping paper must be within immediate reach of the driver while the vehicle is in operation and must be available to emergency responders. Locking it away, leaving it in the trailer, or keeping it at the office defeats that purpose. Accessibility is the key requirement.

Question 38Hazardous materials regulations, communication rules, and incident reporting

A driver is reviewing a shipping paper for a material that is regulated only when transported by water. Which notation would indicate that the material is not regulated for the current highway shipment?

  1. A notation showing the reportable quantity
  2. A notation showing the packing group
  3. A notation indicating the material is not regulated for highway transport Correct answer.
  4. A notation showing the emergency response telephone number

Explanation

When a material is regulated only in certain modes, the shipping paper may carry a notation clarifying that it is not regulated for the mode being used. Packing group, reportable quantity, and emergency telephone notations describe other regulatory aspects. The notation tells the driver how the material is treated for this trip.

Question 39Hazardous materials regulations, communication rules, and incident reporting

A driver is hauling a placarded load and must respond to a situation in which a package is damaged and leaking. Which action best reflects the driver's responsibilities under the Hazardous Materials Regulations?

  1. Continue to the destination and report the leak on arrival
  2. Wash the leak off the roadway with water before proceeding
  3. Attempt to repackage the leaking material using materials on hand
  4. Keep people away, avoid contact with the material, and notify emergency responders and the carrier Correct answer.

Explanation

In a release, the driver's priority is to protect people and the environment by isolating the area, avoiding contact, and notifying responders and the carrier. Improvised repackaging, continuing the trip, or washing the material away can worsen the hazard. Emergency response information carried with the shipping paper guides these decisions.

Question 40Hazardous materials regulations, communication rules, and incident reporting

A driver is reviewing how hazard communication information flows from the shipper to responders. Which statement best explains why the shipping paper and placards must agree?

  1. Placards are decorative and need not match the paperwork
  2. Responders rely on both to identify the material and its hazards before taking action Correct answer.
  3. Agreement is required only for international shipments
  4. The shipping paper is the only document responders are permitted to read

Explanation

Placards provide an immediate visual warning to responders approaching the vehicle, while the shipping paper supplies detailed information such as the proper shipping name and identification number. Inconsistent information can cause responders to take the wrong protective action. Both must accurately reflect the material being transported.

Question 41Loading, unloading, and segregation of hazardous materials

Under the segregation table for hazardous materials, which pairing must never be loaded together in the same transport vehicle?

  1. Division 1.1 explosives and Division 5.1 oxidizers Correct answer.
  2. Division 4.1 flammable solid and Class 9 miscellaneous
  3. Class 8 corrosive liquid and Class 3 flammable liquid
  4. Division 2.2 non-flammable gas and Class 9 miscellaneous

Explanation

The segregation table treats Division 1.1 explosive loads as incompatible with Division 5.1 oxidizers, because an oxidizer can feed a detonation or fire involving the explosive. These two classes must be kept apart rather than merely separated by distance inside one vehicle.

Question 42Loading, unloading, and segregation of hazardous materials

A shipper offers a package marked with the Division 6.1 poison inhalation hazard label for transport with food products. What is the required action at loading?

  1. Refuse to load the poison packages with food unless they are separated as required Correct answer.
  2. Load them together only if the vehicle is refrigerated
  3. Load the poison packages on the floor beneath the food pallets
  4. Load them together after removing the hazard labels

Explanation

Poison inhalation hazard materials (and other poisonous materials) must be separated from food for human or animal consumption, so the loader cannot simply stack them together. The correct response is to keep the required separation or decline the mixed load.

Question 43Loading, unloading, and segregation of hazardous materials

Before loading hazardous materials, what must the driver verify about the shipping papers?

  1. That the papers are folded inside the cargo and unavailable to others
  2. That the papers list the emergency response telephone number and the basic description Correct answer.
  3. That the papers are signed by the receiver before departure
  4. That the papers show only the total weight of the shipment

Explanation

Shipping papers for hazardous materials must include the basic description and an emergency response telephone number that can be called during transport. The driver checks these before accepting and loading the shipment.

Question 44Loading, unloading, and segregation of hazardous materials

Which action is required when loading cylinders of Division 2.1 flammable gas into a closed van?

  1. Secure the cylinders upright and protect the valves from damage Correct answer.
  2. Remove valve protection caps to speed unloading
  3. Stack cylinders on top of corrosive drums to save floor space
  4. Lay every cylinder horizontally to lower the center of gravity

Explanation

Compressed gas cylinders must be secured against movement and their valves protected so a broken valve does not release gas. Upright positioning with valve protection is the standard loading practice.

Question 45Loading, unloading, and segregation of hazardous materials

What is the purpose of blocking and bracing when loading hazardous materials?

  1. To replace the need for placards on the vehicle
  2. To prevent packages from shifting, sliding, or falling during transport Correct answer.
  3. To reduce the vehicle's gross weight below the placard threshold
  4. To allow incompatible materials to be loaded closer together

Explanation

Blocking and bracing keep packages from moving so containers are not punctured, crushed, or tipped in transit. This is a core loading requirement for hazardous materials.

Question 46Loading, unloading, and segregation of hazardous materials

When may a driver move a vehicle containing hazardous materials that is leaking?

  1. Only after the leak is stopped and the vehicle is safe to move, unless limited movement is necessary for safety Correct answer.
  2. Only if the vehicle travels at reduced speed
  3. Whenever the receiver agrees to accept a leaking package
  4. Whenever the leak involves a corrosive material

Explanation

Ordinary transportation must not continue while hazardous materials are leaking. Movement during an active spill is limited to what safety requires; it is not permission to resume the trip. Otherwise, the leak must be stopped and the vehicle made safe before movement resumes.

Question 47Loading, unloading, and segregation of hazardous materials

A load of Division 4.3 dangerous-when-wet material is being prepared for a flatbed truck. What loading precaution is most important?

  1. Load it directly beside open water containers
  2. Place it where rain can reach it for ventilation
  3. Stack it against the cab to reduce wind exposure
  4. Cover the load so it stays dry and away from moisture Correct answer.

Explanation

Division 4.3 materials react with water to release flammable gas, so they must be kept dry during loading and transport. Covering the load and keeping it away from moisture sources is the essential precaution.

Question 48Loading, unloading, and segregation of hazardous materials

Which document tells the driver the total quantity of hazardous materials loaded and the placards required?

  1. The shipping papers together with the placard requirements Correct answer.
  2. The delivery receipt signed by the shipper
  3. The bill of lading only
  4. The vehicle registration

Explanation

Shipping papers provide the basic description and quantity, and the hazard class shown there determines which placards are needed. The driver uses both to confirm the load is properly marked and placarded.

Question 49Loading, unloading, and segregation of hazardous materials

A driver is loading Class 8 corrosive liquid drums and Class 3 flammable liquid drums in one trailer. Which practice best satisfies segregation and loading requirements?

  1. Load the drums loosely so leaks can be seen during transit
  2. Keep incompatible materials separated as required and secure all drums against movement Correct answer.
  3. Place the flammables next to the engine compartment for warmth
  4. Place the corrosives above the flammables so leaks drain away

Explanation

Class 8 and Class 3 are not an incompatible pair, but all drums still must be secured and any required separation observed. Secure blocking and bracing prevents leaks and spills that could mix materials.

Question 50Loading, unloading, and segregation of hazardous materials

What does the segregation table require for Division 1.1 explosives and Division 1.5 explosives when carried together?

  1. They may be loaded together only at night
  2. They may be loaded together if the driver holds a tanker endorsement
  3. They may be loaded together without restriction
  4. They must be separated according to the table's entry for that pair Correct answer.

Explanation

Different explosive divisions have specific compatibility entries in the segregation table, and the driver must follow the entry for the particular pair. Not all explosive divisions may be co-loaded freely.