CCDL Permit Prep

Hazardous Materials · page 2 of 8

Hazardous Materials questions 21–40

Part of the 159-question Hazardous Materials pool. Each answer cites the FMCSA CDL Manual or the federal rule it comes from.

Practise these as a timed set

  1. When may the brief operational-necessity exception apply to parking a vehicle carrying Division 1.1, 1.2, or 1.3 explosives within 300 feet of a listed place?

    • AOnly when the necessity is brief and no other parking place is practicableCorrect
    • BWhenever the driver wants to rest
    • CWhenever the vehicle is within five feet of the road
    • DWhenever the explosives weigh less than 1,001 pounds

    The normal rule prohibits parking within 300 feet of a bridge, tunnel, dwelling, or place where people work, gather, or assemble. The exception is narrow: operational necessity must make a brief stop necessary and another parking place impracticable.

    eCFR 49 CFR 397.7 — Parking · 397.7(a)(3) — Explosive-material parking distance and brief-necessity exception · verified 2026-09-07

  2. A vehicle contains Division 1.1 explosives and is on the motor carrier's property. When can the federal attendance exception apply?

    • AWhen the lawful bailee knows the explosives, has emergency instructions, and keeps the vehicle in view or at a safe havenCorrect
    • BWhenever the vehicle doors are locked
    • CWhenever the driver is in the sleeper berth
    • DWhenever the load is under 1,001 pounds

    Division 1.1, 1.2, and 1.3 explosive loads normally require continuous attendance. The exception applies only under all listed conditions: an allowed location, a lawful bailee aware of the explosive material and instructed for emergencies, and the vehicle in the bailee's unobstructed view or in a safe haven.

    eCFR 49 CFR 397.5 · 397.5(a)-(b): attendance exception for Division 1.1, 1.2, or 1.3 explosives · verified 2026-09-07

  3. At a fuel island, a hazardous-material vehicle has its engine off, but the driver steps inside to pay while no one controls the nozzle. Does this meet the federal fueling requirement?

    • ANo; a person must control the fueling process at the point where the fuel tank is filledCorrect
    • BYes; the engine-off condition is the only federal requirement
    • CYes; the driver is still on the fuel-station property
    • DYes; payment activity replaces nozzle control

    49 CFR 397.15 requires both conditions while a vehicle containing hazardous materials is fueled: its engine must not operate, and a person must control fueling at the point where the tank is filled. Being elsewhere on the property does not meet the second condition.

    eCFR 49 CFR 397.15 · 397.15(a)-(b): engine and fueling-process control · verified 2026-09-07

  4. When a placarded hazmat vehicle is not subject to a non-radioactive hazmat routing designation, which route approach follows the federal rule?

    • AUse only interstate highways at all times
    • BChoose a route through listed areas whenever it saves time
    • CAvoid heavily populated areas, crowds, tunnels, narrow streets, and alleys unless a stated exception appliesCorrect
    • DTake the shortest route regardless of restrictions

    For a placarded or marked load outside an NRHM routing designation, the carrier must avoid the listed areas unless there is no practicable alternative, a reasonable deviation is needed for a listed facility, or emergency conditions require it.

    eCFR 49 CFR 397.67(b) · 397.67(b): routing outside NRHM designations · verified 2026-09-07

  5. What is the general placarding rule for a material listed in Table 1 of 49 CFR 172.504?

    • APlacard the vehicle or freight container for any quantity, subject to the rule's provisionsCorrect
    • BPlacard only when the aggregate gross weight reaches 1,001 pounds or more
    • CPlacard only bulk packaging; non-bulk Table 1 packages need labels only
    • DPlacard only when the shipper requests it on the shipping paper

    Table 1 materials require placards for any quantity under the general rule. Table 2 has a different aggregate-weight threshold, and the regulation contains specific exceptions and special provisions that must be checked.

    eCFR 49 CFR 172.504 — General placarding requirements · 172.504(c), Table 1, and Table 2 — Placarding thresholds · verified 2026-09-29

  6. For 1,001 pounds or more of a Division 2.1 material in non-bulk packages, which placard does the 49 CFR 172.504 table specify?

    • ACOMBUSTIBLE
    • BFLAMMABLE GASCorrect
    • CPOISON GAS
    • DFLAMMABLE

    The placarding table lists FLAMMABLE GAS for Division 2.1. This question uses the Table 2 1,001-pound threshold for non-bulk packages; separate rules can require placarding for other conditions, including bulk packages.

    Electronic Code of Federal Regulations · 49 CFR 172.504(a), Table 2; 49 CFR 172.504(c) · verified 2026-09-08

  7. For Division 1.1 or 1.2 explosives, what is the normal federal parking-distance rule for a bridge, tunnel, dwelling, or place where people work, gather, or assemble?

    • ADo not park within 100 feet, except when a brief stop is operationally necessary
    • BDo not park within 500 feet, with no exception for brief operational stops
    • CDo not park within 300 feet, except for the stated brief operational-necessity exceptionCorrect
    • DDo not park within 50 feet, as long as the vehicle stays attended the whole time

    The rule normally prohibits parking within 300 feet of the listed places for Division 1.1, 1.2, or 1.3 explosives. It includes a narrow exception for brief operational necessity when another parking location is impracticable.

    eCFR 49 CFR 397.7 — Parking · 397.7(a)(3) — Explosive-material parking distance and brief-necessity exception · verified 2026-09-29

  8. Which hazardous-material division covers poisonous materials?

    • ADivision 2.1
    • BDivision 6.1Correct
    • CDivision 4.1
    • DClass 8

    Division 6.1 covers poisonous materials. Do not treat every Class 6 material as Division 6.1: Division 6.2 covers infectious substances. Use the applicable hazardous-material table and the actual shipment details to determine required labels or placards.

    49 CFR § 173.132; 49 CFR § 172.554 · 173.132 Division 6.1 poisonous materials; 172.554 POISON placard · verified 2026-09-07

  9. Which statement correctly describes the FMCSA Hazardous Materials Safety Permit requirement?

    • AIt applies to specified materials at the quantities or packaging capacities listed in 49 CFR 385.403Correct
    • BIt applies to every load that needs a placard
    • CIt applies only to flammable liquids in cargo tanks
    • DIt applies to every hazardous-material shipment above 1,000 pounds

    The carrier must compare the actual material, quantity, and packaging with the permit list. The list includes specified radioactive, explosive, inhalation-hazard, and certain methane-rich gas shipments. A placard alone does not decide the permit requirement.

    eCFR 49 CFR · 385.403(a)–(f) · verified 2026-09-07

  10. A driver finds a flat tire on a placarded vehicle where repairing it is not safe. What limited movement does 49 CFR 397.17 allow?

    • ADrive slowly until a convenient service shop is reached
    • BLeave the vehicle unattended until help arrives
    • CContinue to the planned destination if hazard flashers are on
    • DDrive only to the nearest safe place for the required repair, replacement, or inflationCorrect

    A flat, leaking, or improperly inflated tire must be repaired, replaced, or properly inflated before the vehicle is driven. The limited exception allows travel only to the nearest safe place to do that work; it does not authorize travel to a convenient destination.

    eCFR 49 CFR 397.17 · 397.17(b): flat, leaking, or improperly inflated tire · verified 2026-09-07

  11. A non-exempt release into the environment reaches a hazardous substance’s reportable quantity within 24 hours. Under the EPA release-notice rule, when must the person in charge notify the National Response Center?

    • AAfter the next scheduled delivery
    • BOnly when the written incident report is due
    • CImmediately upon knowledge of the reportable releaseCorrect
    • DAfter waiting 24 hours to see whether more leaks

    A reportable quantity is a substance-specific threshold. For a release covered by this rule, notify the NRC immediately upon knowledge. The 24-hour period measures the released amount; it is not permission to delay notice.

    US EPA 40 CFR § 302.6 Notification requirements · 40 CFR 302.6(a) · verified 2026-09-25

  12. For domestic transportation, which class generally does not require a CLASS 9 placard?

    • AClass 3 flammable liquids
    • BClass 9 miscellaneous hazardous materialsCorrect
    • CDivision 2.2 non-flammable gases
    • DClass 8 corrosive materials

    For domestic transportation, 49 CFR 172.504 says a CLASS 9 placard is not required for a material classed as Class 9. This is a CLASS 9 placard exception, not a rule that removes other required hazard communication or every international requirement. A bulk package still needs the required identification-number display.

    49 CFR § 172.504 · 172.504(f)(9) Class 9 placard exception for domestic transportation · verified 2026-09-07

  13. During loading or unloading of Class 1 explosives, when may the engine remain running?

    • AWhen the temperature is below freezing
    • BWhenever a fire extinguisher is present
    • COnly to operate pumping equipment on a multipurpose bulk truck or a qualifying blasting cargo tankCorrect
    • DWhen cab lights are needed

    The engine must be stopped while Class 1 explosives are loaded or unloaded. The narrow exceptions allow use of pumping equipment on a multipurpose bulk truck and on a cargo tank motor vehicle transporting a single bulk hazardous material for blasting. A general transfer pump, weather, or a fire extinguisher does not create an exception.

    eCFR 49 CFR 177.835 · 177.835(a): engine stopped while handling Class 1 explosives · verified 2026-09-07

  14. Under 49 CFR 172.403, how many radioactive package label categories are listed?

    • A2
    • B5
    • C4
    • D3Correct

    The listed label categories are RADIOACTIVE WHITE-I, RADIOACTIVE YELLOW-II, and RADIOACTIVE YELLOW-III. The required category is based on both the package transport index and its maximum surface radiation level.

    eCFR 49 CFR 172.403 · 49 CFR 172.403(b)-(c): Class 7 radioactive material labels · verified 2026-09-08

  15. Before transport, what must be done with a hazardous-material package that is not permanently attached to the vehicle?

    • ASecure it against shifting, including relative movement between packagesCorrect
    • BSecure it only when it is a gas cylinder
    • CLeave it loose if the vehicle has a closed trailer
    • DPlace valves or fittings where they are most exposed to damage

    Federal rules require every hazardous-material package that is not permanently attached to the vehicle to be secured against shifting under normal transportation conditions. Packages with valves or fittings must be loaded to minimize damage.

    eCFR 49 CFR 177.834 · 177.834(a): packages secured against shifting · verified 2026-09-07

  16. Under 49 CFR 173.21, what is the rule for a material or package listed as forbidden?

    • AIt may be offered only with an escort vehicle
    • BIt may not be offered for transportation or transported unless the regulations otherwise provideCorrect
    • CIt may be transported only by air
    • DIt may be transported only with a special permit

    Section 173.21 states that, unless the hazardous-materials regulations otherwise provide, offering for transportation or transporting its listed materials and packages is forbidden.

    eCFR 49 CFR 173.21 · 173.21 — Forbidden materials and packages · verified 2026-09-07

  17. For a shipment that requires an FMCSA Hazardous Materials Safety Permit, what permit evidence must be kept in the vehicle?

    • AOnly the driver’s CDL
    • BOnly a safety data sheet
    • CNo permit evidence if the carrier has a permit at its office
    • DA copy of the permit or a document clearly identifying its FMCSA Safety Permit numberCorrect

    The vehicle must carry the permit copy or the allowed permit-number document. This evidence does not replace shipping papers, emergency information, or the other requirements that apply to the shipment.

    eCFR 49 CFR · 385.415(a)(1) · verified 2026-09-07

  18. A cargo tank required placards for its load. It has been emptied but still contains hazardous residue and has not met an exception. What happens to its placards?

    • ARemove them at the end of the shift
    • BKeep the required placards on the tankCorrect
    • CRemove them because delivery is complete
    • DRemove them after crossing a state line

    An emptied bulk packaging normally remains placarded. Unloading alone does not remove hazardous residue or vapor. Verify an applicable exception before changing placards.

    eCFR 49 CFR · 172.514(b) · verified 2026-09-07

  19. What is the Emergency Response Guidebook used for?

    • AHelping identify hazards and protective actions during the initial phase of an incidentCorrect
    • BListing every approved hazardous-material carrier
    • CRecording cargo dimensions
    • DCertifying drivers to transport hazardous materials

    The guide supports initial emergency decisions using the material’s name or identification number. It does not certify a driver or replace the training and equipment needed to act safely.

    Oregon DMV Commercial Driver Manual · 9.7.1 · verified 2026-09-07

  20. What is the purpose of the federal hazardous-material segregation rules?

    • AKeeping incompatible hazardous materials apart from each other to prevent dangerous reactions if a leak or spill occursCorrect
    • BSeparating HazMat cargo from general freight by weight class
    • CDividing the trailer into sections with fireproof barriers
    • DKeeping HazMat in a separate trailer from passengers, distinct from keeping chemically incompatible materials apart

    Segregation rules prevent prohibited materials from being stored, loaded, or transported where a leak could allow dangerous commingling. The federal table and its notes control the required separation; do not assume that every oxidizer-and-flammable pairing has the same rule.

    eCFR 49 CFR 177.848 · 177.848(c)–(d): segregation table and prohibitions · verified 2026-09-07