A shipment is subject to hazardous-materials shipping-paper requirements, but the shipper says the paperwork will be emailed after you leave. What should you do?
Correct answer: Do not accept it for transportation until the required, properly prepared shipping paper is available.
When shipping papers are required, labels and a promise of later paperwork are not substitutes. The current rule expressly preserves exceptions for materials that are exempt from shipping-paper requirements.
Source: Oklahoma Commercial Driver's License Manual, Version March 2025 (model core Version July 2017), 9.6.10 Shipping Papers and Emergency Response Information; physical PDF page 117. Federal legal cross-check (reviewed September 29, 2026): 49 CFR 177.817(a), (d), https://www.ecfr.gov/current/title-49/subtitle-B/chapter-I/subchapter-C/part-177/subpart-A/section-177.817. ↗
You leave the controls of a truck carrying a hazardous-materials shipment that requires shipping papers. Where should those papers remain?
Correct answer: In the driver-side door holder or on the driver’s seat, readily identifiable.
Responders must be able to find the papers promptly. At the controls, keep them within reach while belted and visible or in the driver-door holder; away from the controls, use that holder or the driver’s seat.
Source: Oklahoma Commercial Driver's License Manual, Version March 2025 (model core Version July 2017), 9.6.10 Shipping Papers and Emergency Response Information; physical PDF page 117. Federal legal cross-check (reviewed September 29, 2026): 49 CFR 177.817(e), https://www.ecfr.gov/current/title-49/subtitle-B/chapter-I/subchapter-C/part-177/subpart-A/section-177.817. ↗
The correct hazard placard is attached, but a loose tarp covers its lower half. What needs to happen before travel?
Correct answer: Secure the tarp and restore the placard’s required visibility and legibility.
A placard must remain clear of obstructions such as tarps and be maintained so its message is legible. Merely having the right placard somewhere on the vehicle is insufficient.
Source: Oklahoma Commercial Driver's License Manual, Version March 2025 (model core Version July 2017), 9.3.10 Placarding, continued; physical PDF page 111. Federal legal cross-check (reviewed September 29, 2026): 49 CFR 172.516(c)(2), (6), https://www.ecfr.gov/current/title-49/subtitle-B/chapter-I/subchapter-C/part-172/subpart-F/section-172.516. ↗
Hazardous-material drums cannot slide out of the trailer, but they can strike one another and damage their fittings. Is that adequate securement?
Correct answer: No; secure them against shifting, including movement between the packages.
Secure packages against movement during normal transportation and protect valves or fittings from damage. Relative movement between packages can create leaks even inside a closed trailer.
Source: Oklahoma Commercial Driver's License Manual, Version March 2025 (model core Version July 2017), 9.4.1 General Loading Requirements - Secure Against Movement; physical PDF page 113. Federal legal cross-check (reviewed September 29, 2026): 49 CFR 177.834(a), https://www.ecfr.gov/current/title-49/subtitle-B/chapter-I/subchapter-C/part-177/subpart-B/section-177.834. ↗
A hazardous-material package bears required orientation arrows. A loader wants to lay it on its side to fit another pallet. What is the correct response?
Correct answer: Keep the package in the orientation indicated by the markings throughout transport.
Required orientation markings describe how the package must be positioned, not merely how it should look at delivery.
Source: Oklahoma Commercial Driver's License Manual, Version March 2025 (model core Version July 2017), 9.3.7 Package Markings and Labels; physical PDF page 110. Federal legal cross-check (reviewed September 29, 2026): 49 CFR 177.834(b), https://www.ecfr.gov/current/title-49/subtitle-B/chapter-I/subchapter-C/part-177/subpart-B/section-177.834. ↗
Before workers begin loading hazardous material into a motor vehicle, what must the driver ensure about the vehicle itself?
Correct answer: Set the parking brake securely and take other reasonable precautions against movement.
Vehicle movement during a transfer can damage containers or connections. The securement requirement applies before loading or unloading begins.
Source: Oklahoma Commercial Driver's License Manual, Version March 2025 (model core Version July 2017), 9.4.1 General Loading Requirements; physical PDF page 112. Federal legal cross-check (reviewed September 29, 2026): 49 CFR 177.834(e), https://www.ecfr.gov/current/title-49/subtitle-B/chapter-I/subchapter-C/part-177/subpart-B/section-177.834. ↗
Class 3 flammable liquid is being unloaded and a person approaches the transfer area with a lighted cigarette. What is the necessary safety response?
Correct answer: Keep the ignition source away and prevent smoking near the loading or unloading operation.
Smoking and flames present an ignition hazard during flammable-liquid loading and unloading. The regulation specifically prohibits smoking on or about the vehicle during this work.
Source: Oklahoma Commercial Driver's License Manual, Version March 2025 (model core Version July 2017), 9.4.1 General Loading Requirements - No Smoking; physical PDF page 113. Federal legal cross-check (reviewed September 29, 2026): 49 CFR 177.834(c), (d), https://www.ecfr.gov/current/title-49/subtitle-B/chapter-I/subchapter-C/part-177/subpart-B/section-177.834. ↗
You stop to fuel the power unit of a truck carrying placarded hazardous material. Which arrangement is correct?
Correct answer: Shut off the engine and have a person control fueling at the fill point.
For the covered vehicle, the engine must not operate during fueling, and a person must control the process at the point where the fuel tank is filled.
Source: Oklahoma Commercial Driver's License Manual, Version March 2025 (model core Version July 2017), 9.6.7 Refuel with Engine Off; physical PDF page 117. Federal legal cross-check (reviewed September 29, 2026): 49 CFR 397.15, https://www.ecfr.gov/current/title-49/subtitle-B/chapter-III/subchapter-B/part-397/subpart-A/section-397.15. ↗
A placarded load can use a practical, permitted route around a crowded downtown area. What does Oklahoma’s CDL manual advise if going downtown would only be more convenient?
Correct answer: Use the route around the crowded area despite the inconvenience.
The manual advises avoiding heavily populated areas when another route is available and checking applicable permits and route restrictions before starting.
Source: Oklahoma Commercial Driver's License Manual, Version March 2025 (model core Version July 2017), 9.6.5 Route Restrictions, physical PDF pages 116-117; physical PDF page 117. ↗
At pickup, you notice liquid escaping from a hazardous-material package. The shipper offers to place it on an absorbent pad. What is the proper decision?
Correct answer: Refuse the leaking shipment and have the problem handled safely before transport.
The driver’s responsibilities include refusing leaking packages and improper shipments. A pad or a waiver does not repair containment.
Source: Oklahoma Commercial Driver's License Manual, Version March 2025 (model core Version July 2017), 9.2.3 The Driver; physical PDF page 104. ↗
Emergency responders need to identify a load’s hazards quickly. Which shipping-paper information is especially useful for finding the relevant Emergency Response Guidebook entry?
Correct answer: The proper shipping name and hazardous-material identification number.
The ERG is indexed using material identification information, including proper shipping names and identification numbers. Accurate papers help responders identify the material.
Source: Oklahoma Commercial Driver's License Manual, Version March 2025 (model core Version July 2017), 9.7.1 Emergency Response Guidebook; physical PDF page 118. ↗
An unknown substance appears to be leaking from hazardous-material cargo. Should you approach and smell it to identify the chemical?
Correct answer: No; use shipment information from a safe position and avoid contact or inhalation.
Do not identify a leak by touching or smelling it. Toxic material can injure you, and smell is not a reliable warning of danger.
Source: Oklahoma Commercial Driver's License Manual, Version March 2025 (model core Version July 2017), 9.7.3 Fires - Cargo Leaks; physical PDF page 118. ↗
