A shipper has signed the certification, but you see that a hazardous-material package is clearly unsafe. What should you do?
Correct answer: Reject the unsafe package and have the problem resolved before transport.
A certification does not require a carrier to accept clearly unsafe or noncompliant packaging. Resolve the defect through the shipper and carrier rather than treating a signature as a substitute for safe containment.
Source: Washington Commercial Driver Guide, N/10/20; section 9.3.6; physical PDF 116, printed 9-8. ↗
You see a hazard-class placard with no material identification number on it. Does it alone identify the exact chemical in the vehicle?
Correct answer: No; use the shipping description and other required identification information.
A hazard class groups materials by hazard. Use the proper shipping name and identification number from the shipment's information to identify the product; the class symbol alone is not the exact chemical name.
Source: Washington Commercial Driver Guide, N/10/20; section 9.3.1–9.3.2; physical PDF 112, printed 9-4. ↗
A driver has learned general hazard symbols but is newly assigned a regulated hazmat loading task. What training must address that task?
Correct answer: Function-specific training covering the requirements of the work being performed.
General awareness is only one component. Section 172.704 requires training specific to the employee's regulated functions, together with the other applicable safety and security training.
Source: 49 CFR 172.704(a)(1)–(5); current eCFR text as of 2026-09-10, reviewed 2026-09-13. ↗
A new hazmat employee has not yet completed the required training. Under section 172.704, when may the employee perform the new regulated functions?
Correct answer: Under direct supervision of a trained, knowledgeable hazmat employee, with training completed within 90 days.
Both conditions matter: direct supervision by a properly trained and knowledgeable hazmat employee, and completion within 90 days after employment or the change in function. The employer remains responsible for compliance.
Source: 49 CFR 172.704(c)(1), (4); current eCFR text as of 2026-09-10, reviewed 2026-09-13. ↗
For an ordinary highway hazmat description with an assigned packing group, what is the basic sequence on the shipping paper?
Correct answer: Identification number, proper shipping name, hazard class or division, packing group.
The basic sequence is ID number, proper shipping name, class or division, then packing group when applicable. Required subsidiary hazards and other authorized additions follow their specific rules; arbitrary information must not interrupt the basic description.
Source: 49 CFR 172.202(a)(1)–(4), (b); current eCFR text as of 2026-09-10, reviewed 2026-09-13. ↗
Where should quantity and package-type information go relative to an ordinary highway hazmat basic description?
Correct answer: Before or after the basic description, not inserted between its required elements.
Quantity and package information may be placed before or after the basic description. The description's required sequence must remain intact, subject to the specific additions and exceptions in the regulations.
Source: 49 CFR 172.202(a)(5), (a)(7), (b)–(c); current eCFR text as of 2026-09-10, reviewed 2026-09-13. ↗
You leave the controls of a vehicle carrying a shipment that requires a hazmat shipping paper. Where should that paper remain?
Correct answer: On the driver's seat or in the holder mounted inside the driver's door.
When the driver is not at the controls, section 177.817(e)(2)(ii) specifies the driver's seat or the inside driver's-door holder. Emergency personnel need a predictable place to find the paper.
Source: 49 CFR 177.817(e)(2)(ii); current eCFR text as of 2026-09-10, reviewed 2026-09-13. ↗
A carrier accepts a hazardous-material shipment that is not hazardous waste and requires a shipping paper. Under section 177.817, how long must its copy be retained?
Correct answer: One year after acceptance by the carrier.
For hazardous materials other than hazardous waste, the carrier must retain the paper copy or electronic image for one year after acceptance. It must include the acceptance date and remain accessible as the rule specifies.
Source: 49 CFR 177.817(f); current eCFR text as of 2026-09-10, reviewed 2026-09-13. ↗
A highway hazmat shipment has no shipping paper, and no shipping-paper exception applies. May you accept it for transportation?
Correct answer: No; obtain a properly prepared shipping paper before accepting the shipment.
Section 177.817(a) requires the shipping paper before acceptance or highway transportation unless the material is excepted. The question expressly excludes such an exception; a placard or remembered name is not the paper.
Source: 49 CFR 177.817(a), (d); current eCFR text as of 2026-09-10, reviewed 2026-09-13. ↗
A package containing liquid inner containers carries upright-orientation arrows. How should you position it?
Correct answer: With the arrows pointing upward in the required upright orientation.
Orientation markings communicate how the package must be kept upright. They are not travel-direction arrows or optional stacking advice.
Source: Washington Commercial Driver Guide, N/10/20; section 9.3.7; physical PDF 116, printed 9-8. ↗
A highway vehicle holds non-bulk Table 2 hazmat packages: 700 pounds from one shipper and 400 pounds from another, including packaging. No other exception applies. Can each shipment use the under-1,001-pound vehicle exception separately?
Correct answer: No; the vehicle's aggregate Table 2 gross weight is 1,100 pounds.
For this highway exception, add the qualifying Table 2 hazardous materials on the vehicle. Separate bills or shippers do not reset the threshold. The combined 1,100-pound gross weight exceeds it.
Source: 49 CFR 172.504(c)(1); current eCFR text as of 2026-09-10, reviewed 2026-09-13. ↗
A bulk package contains Table 2 hazardous material weighing less than 1,001 pounds. May the carrier rely on section 172.504(c)'s small-load exception just because the weight is low?
Correct answer: No; that exception expressly excludes bulk packagings.
The less-than-1,001-pound exception is not a general exemption for bulk packages. Evaluate the actual bulk-package and material provisions, including any separate exception, rather than applying the non-bulk weight rule.
Source: 49 CFR 172.504(c); current eCFR text as of 2026-09-10, reviewed 2026-09-13. ↗
A qualifying mixed Table 2 non-bulk load uses DANGEROUS placards. One loading facility adds exactly 2,205 pounds gross of a category requiring its own Table 2 placard. Is DANGEROUS alone sufficient for that category?
Correct answer: No; the specific placard for that category must also be applied.
At 1,000 kg (2,205 pounds) aggregate gross weight or more of one category loaded at one facility, section 172.504(b) requires that category's specific placard. The threshold includes exactly 2,205 pounds.
Source: 49 CFR 172.504(b); current eCFR text as of 2026-09-10, reviewed 2026-09-13. ↗
When selecting placards for a Division 6.1 material, why must you check whether it is poisonous by inhalation?
Correct answer: Poisonous-by-inhalation material is listed in Table 1 rather than the ordinary Table 2 poison category.
The current tables distinguish Division 6.1 material poisonous by inhalation from other Division 6.1 material. Do not automatically apply the Table 2 small-load exception to a Table 1 inhalation-hazard shipment.
Source: 49 CFR 172.504(e), Tables 1 and 2; current eCFR text as of 2026-09-10, reviewed 2026-09-13. ↗
Which hazard class identifies radioactive material?
Correct answer: Class 7.
Class 7 is radioactive material. Specific labeling, placarding, package and transport controls depend on the shipment; recognizing the class is only the first step.
Source: 49 CFR 172.504(e), Table 1, Class 7 entry; current eCFR text as of 2026-09-10, reviewed 2026-09-13. ↗
Before starting hazardous-material loading or unloading, what should you do about vehicle movement?
Correct answer: Set the parking brake and make sure the vehicle cannot move.
Secure the vehicle before the operation starts. Parking-brake application and any other needed precautions prevent movement during loading or unloading.
Source: Washington Commercial Driver Guide, N/10/20; section 9.4.1; physical PDF 118, printed 9-10. ↗
At pickup, a Division 6.2 infectious-substance package shows damage and signs of leakage. What is the appropriate acceptance decision?
Correct answer: Do not accept it; notify the responsible supervisor and have the hazard addressed.
The guide says not to accept packages that appear damaged or show leakage. Notify the supervisor and follow the relevant response procedure without exposing yourself to the material.
Source: Washington Commercial Driver Guide, N/10/20; section 9.7.4, Class 6; physical PDF 125, printed 9-17. ↗
You are offered two different hazardous products for the same cargo space. What establishes whether they may be loaded together?
Correct answer: The applicable segregation and compatibility requirements for those specific materials.
Some hazardous materials must be kept apart or cannot share the same cargo space. Package fit, destination and legal vehicle weight do not establish chemical compatibility; consult the applicable segregation rules before loading.
Source: Washington Commercial Driver Guide, N/10/20; section 9.4.1, Mixed loads; physical PDF 120, printed 9-12. ↗
Compressed-gas cylinders are loaded for transport. What must their support and restraint prevent?
Correct answer: The cylinders turning over or moving unsafely, with their required orientation maintained.
Use suitable racks, boxes or other compliant restraint and follow the cylinder's design and orientation requirements. The guide permits certain horizontal arrangements only with the relief valve in the vapor space; it does not authorize laying every cylinder flat.
Source: Washington Commercial Driver Guide, N/10/20; section 9.4.1, Class 2 materials; physical PDF 119, printed 9-11. ↗
An empty tank motor vehicle was used to haul Class 3 flammable material and required hazmat markings or placards when loaded. Under section 397.13, may someone smoke 20 feet from it?
Correct answer: No; the rule prohibits smoking on or within 25 feet of that empty tank vehicle.
Section 397.13(b) explicitly includes an empty tank motor vehicle previously used in the specified marked or placarded service. Empty does not automatically mean free of flammable residue or vapor.
Source: 49 CFR 397.13(a)–(b); current eCFR text as of 2026-09-10, reviewed 2026-09-13. ↗
A driver is asleep in the sleeper berth of a placarded hazmat vehicle. Does that count as attending it under section 397.5?
Correct answer: No; attendance on the vehicle requires being awake and not in the sleeper berth.
The section's definition requires the person on the vehicle to be awake and outside the sleeper berth. The alternative is being within 100 feet with an unobstructed view. Whether attendance is required also depends on the section's conditions and exceptions.
Source: 49 CFR 397.5(c)–(d)(1); current eCFR text as of 2026-09-10, reviewed 2026-09-13. ↗
What is the main purpose of the 2024 Emergency Response Guidebook?
Correct answer: Help first responders during the initial phase of a hazardous-material transportation incident.
PHMSA describes the ERG as initial-phase guidance for first responders. It helps with early protective decisions; it is not a replacement for required training, specialized response capability or complete transport regulations.
Source: PHMSA, Emergency Response Guidebook (ERG), 'Quickly Identify Hazardous Materials Emergency Procedures'; updated 2026-08-26, reviewed 2026-09-13. ↗
Hazardous material is leaking from your vehicle, and there is no phone where you have stopped. Should you drive to a truck stop just to find one?
Correct answer: No; keep people away and arrange help without spreading the leak along the road.
Do not keep hauling a leak to find a phone or help. Movement is limited to what safety requires and only when it can be done without danger; it is not permission to drive to a convenient service location. Call or safely send for help.
Source: Washington Commercial Driver Guide, N/10/20; section 9.7.3; physical PDF 124, printed 9-16. ↗
You ask another person to contact emergency responders about a hazmat incident. Which information is most useful to send?
Correct answer: Exact location and direction of travel, what happened, and the known shipment identification.
Give responders enough information to find the scene and bring suitable resources: location, direction, nature of the emergency, carrier contact and the known proper shipping name, class and ID number. Write the information down if practical and safe.
Source: Washington Commercial Driver Guide, N/10/20; section 9.7.3; physical PDF 124, printed 9-16. ↗
An injury directly caused by hazardous material during transportation requires admission to a hospital. Property damage is small. Does section 171.15 still require NRC notification?
Correct answer: Yes; the hospital-admission injury itself is a reportable trigger.
Section 171.15(b)(1)(ii) lists an injury requiring hospital admittance as its own trigger. It does not require a $50,000 property-loss threshold. Provide prompt telephone notice as required, alongside emergency assistance and any other reporting obligations.
Source: 49 CFR 171.15(a), (b)(1)(ii); current eCFR text as of 2026-09-10, reviewed 2026-09-13. ↗
