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Colorado CDL Hazmat study materials
Colorado CDL Hazmat study resources

Colorado CDL Hazmat practice questions

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Question 1Hazardous materials regulations and definitions

Under the hazardous materials regulations, a material is classified as hazardous if it is capable of posing an unreasonable risk to health, safety, and property when transported in commerce and is listed in which reference?

  1. The North American Industry Classification System manual
  2. The Commercial Driver's License manual glossary
  3. The Hazardous Materials Table in 49 CFR 172.101 Correct answer.
  4. The Federal Motor Carrier Safety Regulations pocketbook index

Explanation

The Hazardous Materials Table at 49 CFR 172.101 is the master list that assigns proper shipping names, hazard classes, identification numbers, packing groups, and labels to regulated materials. A material not listed may still be regulated if it meets a hazard class definition, but the Table is the primary listing reference.

Question 2Hazardous materials regulations and definitions

A driver is hauling a material that meets the definition of a flammable liquid. Which hazard class number applies?

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

Explanation

Flammable and combustible liquids fall in hazard Class 3. Class 2 covers gases, Class 8 covers corrosives, and Class 9 covers miscellaneous hazardous materials that do not fit another class.

Question 3Hazardous materials regulations and definitions

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

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

Explanation

Materials that are toxic by inhalation and meet the regulatory criteria for inhalation hazard require the POISON INHALATION HAZARD placard, which reflects the added danger of toxic gas exposure in a spill. A general POISON placard applies to other Division 6.1 materials that do not meet those inhalation criteria.

Question 4Hazardous materials regulations and definitions

What does the identification number stenciled or displayed on a hazmat package or orange panel represent?

  1. The packing group assigned by the shipper
  2. The four-digit DOT identification number for the material Correct answer.
  3. The emergency response telephone extension
  4. The carrier's internal tracking number

Explanation

The four-digit identification number, such as UN1203 for gasoline, is assigned in the Hazardous Materials Table and identifies the specific material for emergency responders. It is not a carrier tracking code or a packing group indicator.

Question 5Hazardous materials regulations and definitions

A shipper offers a material in Packing Group I. What does this packing group indicate?

  1. The material presents medium danger
  2. The material presents minor danger
  3. The material presents great danger Correct answer.
  4. The material is exempt from regulation

Explanation

Packing Group I represents great danger, Packing Group II medium danger, and Packing Group III minor danger within a hazard class. The assignment drives packaging strength requirements and certain shipping paper entries.

Question 6Hazardous materials regulations and definitions

Which document must accompany a hazardous materials shipment and contain the basic description of the material?

  1. The annual inspection report
  2. The vehicle registration
  3. The bill of lading only when requested by the receiver
  4. The shipping paper Correct answer.

Explanation

The shipping paper must accompany the shipment and include the basic description: proper shipping name, hazard class, identification number, and packing group in the required sequence. It also carries emergency response information and the shipper's certification.

Question 7Hazardous materials regulations and definitions

A driver is told a material is a 'hazardous substance' under CERCLA reporting rules. Which characteristic most directly triggers that designation?

  1. The material is shipped in a package weighing more than 50 pounds
  2. The material requires a placard on the vehicle
  3. The material is listed in Appendix A to 49 CFR 172.101 and meets the reportable quantity threshold Correct answer.
  4. The material is transported across state lines

Explanation

A hazardous substance is a material listed in Appendix A to the Hazardous Materials Table that is offered in a quantity equal to or greater than its reportable quantity in one package. Placarding and interstate movement are separate concepts from the CERCLA hazardous substance designation.

Question 8Hazardous materials regulations and definitions

What is the purpose of the emergency response information required with a hazardous materials shipment?

  1. To record the vehicle's cargo weight distribution
  2. To certify that the shipper has paid hazmat registration fees
  3. To list the driver's hours of service for the trip
  4. To provide responders with immediate guidance for handling an incident Correct answer.

Explanation

Emergency response information gives firefighters and other responders immediate guidance such as firefighting methods, spill handling, and first aid for the specific material. It must be immediately available during transportation.

Question 9Hazardous materials regulations and definitions

A driver picks up a load of Division 4.1 flammable solids. Which statement correctly describes the required hazard communication?

  1. The vehicle must display the FLAMMABLE SOLID placard when the placarding threshold is met Correct answer.
  2. The OXIDIZER placard is used for flammable solids
  3. Only the shipping paper is needed and no placard can be used
  4. The vehicle never requires a placard because solids burn slowly

Explanation

Division 4.1 flammable solids require the FLAMMABLE SOLID placard when the quantity in the vehicle meets the placarding threshold in the regulations. Placarding is based on hazard class and quantity, not on how quickly a solid is expected to burn.

Question 10Hazardous materials regulations and definitions

A shipping paper entry reads 'Gasoline, 3, UN1203, PG II.' Which element is missing from the basic description sequence?

  1. The hazard class
  2. The packing group
  3. The proper shipping name Correct answer.
  4. The identification number

Explanation

The basic description must appear in the sequence proper shipping name, hazard class, identification number, and packing group. The entry begins with the hazard class, so the proper shipping name, Gasoline, is absent.

Question 11Hazardous materials regulations and definitions

A material is described as a Division 2.3 gas. What does this classification tell the driver?

  1. The material is a flammable gas that burns readily
  2. The material is a refrigerated liquid
  3. The material is a nonflammable gas that supports combustion
  4. The material is toxic and poses a poisoning hazard Correct answer.

Explanation

Division 2.3 covers gases that are toxic or corrosive and are harmful to human health. Flammable gases are Division 2.1 and nonflammable, nonpoisonous gases are Division 2.2.

Question 12Hazardous materials regulations and definitions

A driver is hauling a Class 8 corrosive liquid in nonbulk packaging. Which placard is appropriate when placarding is required?

  1. FLAMMABLE
  2. DANGEROUS WHEN WET
  3. CORROSIVE Correct answer.
  4. POISON

Explanation

Class 8 materials are corrosives and use the CORROSIVE placard when the quantity triggers placarding. The other placards correspond to Division 6.1 toxic materials, Class 3 flammable liquids, and Division 4.3 water-reactive materials respectively.

Question 13Hazardous materials regulations and definitions

How does the regulations' definition of a 'hazardous waste' relate to hazardous materials rules?

  1. Hazardous waste rules apply only to bulk tank shipments
  2. Hazardous waste is regulated under hazmat rules only when it is also listed in the Hazardous Materials Table
  3. A hazardous waste is a material subject to EPA waste rules that is also a hazardous material for transportation Correct answer.
  4. Hazardous waste is never subject to DOT hazmat rules

Explanation

For transportation purposes, a hazardous waste is a material that is subject to EPA hazardous waste regulation and also meets the DOT definition of a hazardous material. It must be described on shipping papers with the word 'Waste' preceding the proper shipping name.

Question 14Hazardous materials regulations and definitions

A shipper offers a material that is a hazardous material in a quantity that requires placarding. Who is responsible for providing the placards?

  1. The driver, who must buy them at the first scale house
  2. The motor carrier, who must furnish the required placards Correct answer.
  3. The state highway patrol, which issues them with the permit
  4. The receiver, who applies them after unloading

Explanation

The motor carrier is responsible for furnishing the required placards for the vehicle, while the shipper must provide the hazard communication information needed to select them. Placards are not purchased at scales, applied by receivers after delivery, or issued by enforcement agencies.

Question 15Hazardous materials regulations and definitions

A driver finds that a package label is missing on a nonbulk hazmat package. What is the appropriate action?

  1. Apply a generic label from the cab supply
  2. Refuse to accept or transport the package until the labeling is corrected Correct answer.
  3. Accept the package if the shipping paper description is correct
  4. Note the discrepancy on the bill of lading and proceed

Explanation

A package offered for transportation must be properly marked, labeled, and in condition for shipment. A driver who observes a missing required label should not accept the package until it is corrected, because accepting it places the driver and public at risk and violates the rules.

Question 16Hazardous materials regulations and definitions

What does the hazard class number on a placard or shipping paper primarily communicate to emergency responders?

  1. The weight of the shipment
  2. The route the vehicle must follow
  3. The type of hazard the material presents Correct answer.
  4. The date the material was manufactured

Explanation

The hazard class identifies the general nature of the hazard, such as flammable, corrosive, or toxic, allowing responders to select appropriate tactics. Weight, routing, and manufacturing date are not conveyed by the hazard class number.

Question 17Hazardous materials regulations and definitions

A carrier transports a material that is forbidden for transport under the Hazardous Materials Table. What is the correct action?

  1. Do not offer or transport the material Correct answer.
  2. Transport it only at night to reduce exposure
  3. Transport it only if the driver holds a tank endorsement
  4. Transport it with a special permit obtained by the driver

Explanation

A material shown as forbidden in the Hazardous Materials Table may not be offered or transported in commerce except under a specific approval issued by the agency. Drivers cannot create authority through timing, endorsements, or self-obtained permits.

Question 18Hazardous materials regulations and definitions

A driver is reviewing a shipping paper and sees the entry 'Waste Acetone, 3, UN1090, PG II.' What does the word 'Waste' indicate?

  1. The material has been rejected by a receiver
  2. The material is being returned for credit
  3. The material is exempt from hazmat rules
  4. The material is a hazardous waste subject to EPA and DOT requirements Correct answer.

Explanation

The word 'Waste' preceding the proper shipping name identifies the shipment as hazardous waste, which triggers both EPA waste requirements and DOT transportation requirements. It does not create an exemption or indicate a commercial return.

Question 19Hazardous materials regulations and definitions

Which statement correctly distinguishes a hazardous material from a hazardous substance for transportation purposes?

  1. A hazardous material is any material that requires a shipping paper
  2. Every hazardous material is also a CERCLA hazardous substance
  3. A hazardous substance is a listed material offered at or above its reportable quantity, while a hazardous material is any regulated material Correct answer.
  4. A hazardous substance is any material that requires a placard

Explanation

Hazardous material is the broad regulatory category for materials meeting hazard class definitions or listed in the Table. Hazardous substance is a narrower designation for materials listed in Appendix A that are offered in quantities at or above the reportable quantity.

Question 20Hazardous materials regulations and definitions

A driver is asked to move a material that is classified as a Division 4.3 dangerous when wet material. Which handling concern is most directly tied to this classification?

  1. The material may explode when exposed to light
  2. The material may spontaneously polymerize in the package
  3. The material may ignite or release flammable gas on contact with water Correct answer.
  4. The material may become corrosive at low temperatures

Explanation

Division 4.3 materials react with water to release flammable or toxic gases or to ignite. Keeping them dry and away from water sources is the central handling concern for this class.

Question 21Hazardous materials regulations and definitions

A driver hauls a load requiring the POISON placard and the FLAMMABLE placard. Which placarding approach is correct?

  1. Display both required placards Correct answer.
  2. Display only the POISON placard because toxicity dominates
  3. Display neither placard if the load is under 1,000 pounds
  4. Display only the placard for the hazard with the highest class number

Explanation

When a vehicle contains materials requiring different placards and the quantities trigger placarding, each required hazard warning must be displayed. Placards are not selected by class number ranking or by a fixed weight cutoff of 1,000 pounds.

Question 22Hazardous materials regulations and definitions

A shipper offers a bulk shipment of a material that meets the definition of a hazardous material but is not listed by name in the Hazardous Materials Table. Which statement best describes the shipper's obligation?

  1. The shipper must select the proper shipping name using the class definitions and Table rules Correct answer.
  2. No shipping paper is needed because the material is unlisted
  3. The driver may choose any generic name on the shipping paper
  4. The material may be shipped as nonregulated cargo

Explanation

A material that meets a hazard class definition is regulated even if not listed by name, and the shipper must determine the proper shipping name using the Table and the classification rules, often selecting an n.o.s. entry. The driver cannot invent a name, and unlisted status does not exempt the material.

Question 23Hazardous materials regulations and definitions

A driver is carrying a material with a subsidiary hazard of Division 6.1 in addition to its primary Class 3 hazard. How should this be reflected in hazard communication?

  1. Subsidiary hazards are recorded only on the annual inspection report
  2. Only the primary hazard is ever shown on labels and placards
  3. The subsidiary hazard replaces the primary hazard on the shipping paper
  4. The subsidiary hazard may require an additional label and is noted on the shipping paper Correct answer.

Explanation

Subsidiary hazards are shown on package labels as additional labels and are entered in parentheses after the primary hazard class on the shipping paper. They do not replace the primary hazard and are not limited to maintenance records.

Question 24Hazardous materials regulations and definitions

A carrier wants to move a placarded quantity of a hazardous material through a state that requires a hazmat route designation. Which principle applies?

  1. Route restrictions apply only to bulk tank vehicles
  2. Federal law prohibits states from designating hazmat routes
  3. The carrier must follow the state's designated hazmat routes and any local restrictions Correct answer.
  4. The driver may choose any route if the placards are removed

Explanation

States and localities may designate preferred hazmat routes and impose restrictions such as tunnel or bridge prohibitions, and carriers must comply with those designations. Removing placards to avoid routing rules is not permitted, and the restrictions are not limited to tank vehicles.

Question 25Hazardous materials regulations and definitions

A driver is offered a package whose markings show a proper shipping name that does not match the shipping paper description. What is the most appropriate response?

  1. Accept the package if the hazard class matches
  2. Accept the package and rely on the placard for identification
  3. Reject the package until the shipper resolves the discrepancy Correct answer.
  4. Accept the package and correct the shipping paper in transit

Explanation

Markings, labels, and shipping paper description must be consistent for a package to be offered and accepted. A mismatch means the shipment is not properly described, and the driver should refuse it until the shipper corrects the documentation and markings.

Question 26Hazardous materials regulations and definitions

Under the federal hazardous materials regulations, what does the term 'hazmat employee' describe?

  1. A government inspector authorized to open and examine hazardous materials packages
  2. A person who directly affects hazardous materials transportation safety, including loading, unloading, and preparing shipping papers Correct answer.
  3. Any person employed by a motor carrier that holds a hazmat operating authority
  4. A driver who holds a commercial license with a hazardous materials endorsement

Explanation

A hazmat employee is defined by function, not by job title or license: anyone who directly affects hazmat transportation safety, such as loading, unloading, packaging, marking, labeling, or preparing shipping papers, must be trained. Holding an endorsement or working for a carrier does not by itself create the status, and inspectors are regulators rather than hazmat employees.

Question 27Hazardous materials regulations and definitions

A driver is handed a shipping paper that lists the material's hazard class but no UN identification number. Which statement best describes why this matters for the shipment?

  1. The basic description must include the identification number as part of the required sequence Correct answer.
  2. The identification number appears on package labels rather than shipping papers
  3. The identification number is needed only when the load requires placards
  4. The identification number is optional on shipping papers when the class is shown

Explanation

The basic description on a shipping paper must contain, in order, the proper shipping name, hazard class or division, and UN identification number, followed by the packing group when applicable. Omitting the identification number breaks the required sequence and leaves responders without the key lookup number.

Question 28Hazardous materials regulations and definitions

A material is classed as a Division 6.2 infectious substance. Which statement correctly describes what this classification means for the driver?

  1. The material is a liquid that burns readily at room temperature
  2. The material is radioactive and emits ionizing radiation
  3. The material is known or reasonably expected to contain a pathogen capable of causing disease Correct answer.
  4. The material gives off a gas that is toxic when inhaled

Explanation

Division 6.2 covers infectious substances, defined as materials known or reasonably expected to contain pathogens that can cause disease in humans or animals. Toxic gases are Division 2.3 and radioactive material is Class 7, so the divisions are distinct.

Question 29Hazardous materials regulations and definitions

A shipper offers a package marked with the proper shipping name and identification number but with no hazard warning label. What does the regulations' labeling requirement call for in this situation?

  1. The label may be omitted because the marking already identifies the material
  2. The carrier may apply the label at the destination terminal
  3. The label is required only for bulk packages
  4. The package must bear the label for its primary hazard before it may be transported Correct answer.

Explanation

Nonbulk packages must be labeled for their primary hazard, and subsidiary labels are added when the table assigns them. Markings do not substitute for labels, and the shipper is responsible for ensuring the package is properly labeled before offering it for transport.

Question 30Hazardous materials regulations and definitions

A driver is reviewing a shipping paper and sees the entry 'Gasoline, 3, UN1203, PG II.' Which statement about this entry is accurate?

  1. The identification number should appear before the proper shipping name
  2. The packing group is shown in the wrong position and must be moved before the class
  3. The hazard class should be written as 'flammable liquid' instead of a number
  4. The entry is in the correct basic description order for a listed material Correct answer.

Explanation

The basic description order is proper shipping name, hazard class or division, UN identification number, and packing group. The entry follows that exact sequence, so it is properly formatted for a material listed in the Hazardous Materials Table.

Question 31Hazardous materials regulations and definitions

A carrier is transporting a material in a packaging that the Hazardous Materials Table shows as authorized only when the material is in a nonbulk quantity. The shipment is offered in a bulk container. What is the correct conclusion?

  1. The packaging is not authorized for that material and the shipment may not be offered Correct answer.
  2. The shipment may proceed if the container is placarded for the hazard
  3. The carrier may accept it if the shipper signs a waiver on the shipping paper
  4. The shipment is allowed because bulk packaging rules override the table

Explanation

The Hazardous Materials Table specifies which packaging types are authorized for each material, and a packaging not authorized by the table may not be used. Placarding or a shipper waiver does not cure an unauthorized packaging selection, so the shipment cannot be offered in that container.

Question 32Hazardous materials regulations and definitions

A driver is told that a material is a 'hazardous substance' for transportation purposes. Which condition must be met for that term to apply?

  1. The material must be offered by a shipper holding a federal permit
  2. The material must be listed under CERCLA and shipped in a quantity equal to or greater than its reportable quantity in one package Correct answer.
  3. The material must be toxic to aquatic life in any quantity
  4. The material must be listed in the Hazardous Materials Table as a hazardous waste

Explanation

A hazardous substance under the transportation rules is a material listed under CERCLA that is offered in a quantity equal to or exceeding its reportable quantity in one package. Being a hazardous waste or being toxic to aquatic life does not by itself create hazardous substance status, and no federal permit is involved.

Question 33Hazardous materials regulations and definitions

A driver is hauling a hazardous material that requires placards. Which statement about placard placement on a motor vehicle is correct?

  1. Placards are required on the rear and both sides only
  2. Placards must be affixed to all four sides of the vehicle or combination Correct answer.
  3. Placards are required on the front and both sides only
  4. Placards are required only on the rear of the vehicle

Explanation

Placarded vehicles must display placards on all four sides: front, rear, and both sides. This ensures the hazard is visible to responders approaching from any direction, including from behind in traffic.

Question 34Hazardous materials regulations and definitions

A driver is preparing to load a Division 5.2 organic peroxide that requires temperature control. Which handling consideration is most directly tied to this classification?

  1. The material must be stored under water to prevent ignition
  2. The material must be kept away from all sources of ignition but needs no temperature control
  3. The material may require controlled temperature to prevent dangerous decomposition during transport Correct answer.
  4. The material must be transported only in open containers to vent pressure

Explanation

Some organic peroxides are temperature-controlled because heat can trigger a self-accelerating decomposition, so the table and shipping paper note temperature-control requirements. Keeping the load within the specified range prevents runaway decomposition, which is a different concern from simple flammability.

Question 35Hazardous materials regulations and definitions

A driver is reviewing a shipping paper and notices the emergency response telephone number is a personal cell number of the shipper's dispatcher who is off duty. What is the requirement for that number?

  1. Any number is acceptable as long as someone eventually answers during business hours
  2. The number is optional when the material is not a hazardous waste
  3. The number must be monitored at all times the material is in transportation and must reach a person with emergency response information Correct answer.
  4. The number may be the local police non-emergency line

Explanation

The emergency response telephone number must be monitored at all times while the shipment is in transportation, including during storage incidental to movement, and the person reached must have access to emergency response information. A number that goes unanswered when the material is moving does not satisfy the rule.

Question 36Hazardous materials regulations and definitions

A shipper offers a material that is not listed by name in the Hazardous Materials Table but meets the definition of a hazardous material. What is the correct approach to describing it?

  1. It must be described using the appropriate generic or n.o.s. entry that matches its hazard class Correct answer.
  2. It must be assigned a new UN number by the carrier before shipping
  3. It may be described by its trade name alone
  4. It may be shipped without a hazardous materials description because it is unlisted

Explanation

Materials that meet a hazard class definition but lack a specific table entry are described under a generic or 'not otherwise specified' (n.o.s.) entry for that hazard class, along with the technical name where required. Unlisted status does not exempt the material from hazmat regulation.

Question 37Hazardous materials regulations and definitions

A driver is carrying a load of a Class 9 material in a quantity that does not require placards. Which statement about the shipment is correct?

  1. The material becomes unregulated once it is loaded on the vehicle
  2. No shipping paper, marking, or labeling requirements apply because placards are not required
  3. The material is still regulated, and shipping papers, markings, and labels may still be required Correct answer.
  4. Only the placard requirement disappears, and all other requirements also disappear

Explanation

Placarding is only one part of the hazard communication system. A material that does not require placards may still need a shipping paper, package markings, and hazard labels, and the driver must still follow the applicable rules for that material.

Question 38Hazardous materials regulations and definitions

A driver picks up a shipment of a Division 4.2 spontaneously combustible material. Which statement best describes the hazard this classification communicates?

  1. The material is an oxidizing agent that can intensify a fire
  2. The material releases a flammable gas when it contacts water
  3. The material is a liquid that gives off flammable vapors below 60 degrees Celsius
  4. The material ignites readily when exposed to air without an external ignition source Correct answer.

Explanation

Division 4.2 covers spontaneously combustible materials, which can ignite when exposed to air without an outside ignition source. Water-reactive materials are Division 4.3, flammable liquids are Class 3, and oxidizers are Division 5.1.

Question 39Hazardous materials regulations and definitions

A driver is offered a package for a material assigned to Packing Group I. What does the packing group assignment primarily indicate?

  1. The package must be shipped by air rather than highway
  2. The degree of danger presented by the material within its hazard class Correct answer.
  3. The maximum quantity the carrier may load on one vehicle
  4. The state in which the material was manufactured

Explanation

Packing groups express the relative degree of danger within a hazard class, with Packing Group I representing the greatest danger, II moderate, and III minor. The assignment drives packaging performance requirements rather than routing, quantity limits, or origin.

Question 40Hazardous materials regulations and definitions

A driver is transporting a hazardous material through a state that requires a permit for certain hazmat shipments. Which statement best describes the driver's obligation?

  1. The driver must obtain the permit at the state line before proceeding
  2. The driver needs the permit only if the load is placarded
  3. The driver may ignore state requirements because federal rules preempt all state hazmat regulation
  4. The driver must carry the required permit or registration documentation and follow the state's routing rules Correct answer.

Explanation

States may impose permit, registration, and routing requirements for hazardous materials shipments, and drivers must carry the required documentation and follow those routes. Federal rules set a national baseline but do not eliminate valid state permitting and routing requirements.

Question 41Communication rules: shipping papers, placarding, marking and labels

A driver is hauling a load of Division 1.1 explosives. Which shipping paper description is acceptable for this hazardous material?

  1. UN0082 Explosive 1.1D
  2. UN0082, Explosive, blasting, Type B, 1.1D Correct answer.
  3. Explosives, blasting, 1.1D, UN0082
  4. Blasting explosive, Class 1, UN0082

Explanation

The basic description on a shipping paper must appear in a set sequence: the UN identification number, the proper shipping name, the hazard class or division, and the packing group when one is assigned. For a Division 1.1 explosive the compatibility group letter is also required as part of the class entry. Only the option that follows the UN number, proper shipping name, class/division with compatibility group order is compliant.

Question 42Communication rules: shipping papers, placarding, marking and labels

Unless the hazardous material regulations provide an exception, how long must a hazmat carrier keep a copy of the shipping paper after the material is delivered?

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

Explanation

Hazmat carriers are generally required to retain shipping paper records for three years after the material is accepted by the initial carrier. Shippers also keep records for three years. Shorter retention periods do not satisfy the federal recordkeeping requirement.

Question 43Communication rules: shipping papers, placarding, marking and labels

A shipping paper contains two pages and the first page does not show any hazardous materials. What must appear on the first page to alert emergency responders?

  1. A prominent hazard class warning symbol
  2. The total number of hazardous material packages
  3. A notation reading 'Hazmat on board'
  4. A statement that hazardous materials are listed on page 2 Correct answer.

Explanation

When a shipping paper has more than one page and a hazardous material is not listed on the first page, the first page must carry a notation stating that hazardous materials are listed on a later page. This ensures responders know to keep reading. A generic 'hazmat on board' note does not identify where the information is located.

Question 44Communication rules: shipping papers, placarding, marking and labels

What does the X in the basic description column of an emergency response information table indicate about a material?

  1. The material may react dangerously with water Correct answer.
  2. The material is a hazardous waste
  3. The material is forbidden from highway transport
  4. The material requires a special permit to transport

Explanation

In the emergency response guidebook table, an X in the water-reactive column signals that the material reacts dangerously with water. Responders must avoid water-based extinguishing or spill control for such materials. The X does not mean the material is waste, forbidden, or permit-only.

Question 45Communication rules: shipping papers, placarding, marking and labels

A driver picks up a load and the shipping paper shows a hazardous material entry, but the required emergency response telephone number is missing. What is the correct action?

  1. Accept the load and write the carrier's dispatch number on the paper
  2. Accept the load and rely on the placards for emergency information
  3. Accept the load if the shipper signs a waiver
  4. Refuse to accept the shipment until a compliant number is provided Correct answer.

Explanation

A shipping paper for hazardous materials must include an emergency response telephone number that is monitored at all times the material is in transport. A driver should not accept a shipment that lacks this required information. Substituting a dispatch number or relying on placards does not satisfy the requirement, and no waiver makes the paper compliant.

Question 46Communication rules: shipping papers, placarding, marking and labels

How must a shipping paper's hazardous material entries be distinguished from non-hazardous entries when both appear on the same document?

  1. They must be stamped 'Dangerous Goods' in red ink
  2. They must be listed on a separate page attached at the back
  3. They must be written in a separate column with a check box
  4. They must be printed in a contrasting color or highlighted, or the hazmat entries must be placed first Correct answer.

Explanation

Hazardous material descriptions must be distinguishable from other entries, either by printing them in a contrasting color, by highlighting them, or by placing them in a clearly identified separate section or first. The rule is about making the hazmat information easy to find, not about a specific stamp or attachment method.

Question 47Communication rules: shipping papers, placarding, marking and labels

A vehicle carries a quantity of a Table 2 hazardous material that requires placarding. When must the placards be affixed?

  1. Within 30 minutes of departure
  2. Before the vehicle is loaded
  3. At the first weigh station
  4. Before the vehicle enters a public road Correct answer.

Explanation

Required placards must be affixed to the vehicle before it is driven onto a public road. Placarding is not delayed until a weigh station or a set time after departure. The placards must already be in place when the vehicle leaves the terminal.

Question 48Communication rules: shipping papers, placarding, marking and labels

Which placard is required for a vehicle carrying 2,205 pounds (1,001 kg) or more aggregate gross weight of Table 2 materials in a single class?

  1. The specific hazard class placard for that material Correct answer.
  2. The DANGEROUS placard only
  3. No placard, because the quantity is below the threshold
  4. The FLAMMABLE placard regardless of class

Explanation

Table 2 materials require placarding when the aggregate gross weight of all Table 2 materials in a single class reaches 1,001 kg or more. At that point the specific hazard class placard for the material must be displayed. The DANGEROUS placard is used for certain mixed loads, not as a substitute here.

Question 49Communication rules: shipping papers, placarding, marking and labels

A vehicle is carrying a single Table 1 material in any quantity. What placarding is required?

  1. A placard only if the material is a liquid
  2. No placard unless the quantity exceeds 1,001 kg
  3. The specific hazard class placard for that material Correct answer.
  4. The DANGEROUS placard

Explanation

Table 1 materials require placarding in any quantity, with no aggregate weight threshold. The placard displayed must be the specific hazard class placard corresponding to the material. Quantity thresholds and the DANGEROUS placard apply to other situations.

Question 50Communication rules: shipping papers, placarding, marking and labels

When may the DANGEROUS placard be displayed instead of the specific hazard class placards?

  1. Only when the load is entirely non-hazardous
  2. When the load contains two or more categories of Table 2 materials and the aggregate is 1,001 kg or more Correct answer.
  3. Only for materials in Division 6.1
  4. Whenever the driver prefers a single placard

Explanation

The DANGEROUS placard may be used when a vehicle carries two or more categories of Table 2 materials and the aggregate gross weight is 1,001 kg or more. It is an alternative to displaying each specific class placard in that mixed-load situation. It is not a driver preference and does not apply to non-hazardous loads.