Before loading or unloading hazardous material, what must be done to prevent the vehicle from moving?
Correct answer: Securely set the parking brake and take other reasonable precautions.
Set the parking brake securely and take other reasonable precautions to prevent movement. Neither apparently level ground nor transmission position replaces the required brake application.
Source: 49 CFR 177.834(e); current eCFR text for covered operations, retrieved September 21, 2026; reviewed September 21, 2026. ↗
A tool could damage a hazardous package's closure during unloading. Should it be used?
Correct answer: No; use handling equipment that will not damage containment.
Tools likely to impair a package or its closure must not be used. The restriction concerns damaging tools, not a blanket ban on handling equipment.
Source: 49 CFR 177.834(f); current eCFR text for covered operations, retrieved September 21, 2026; reviewed September 21, 2026. ↗
A cargo-tank unloading operation uses the ordinary in-person attendance method, with no special exception or alternative system. How close must the qualified person remain?
Correct answer: Within 25 feet of the cargo tank.
The ordinary method requires the qualified person within 25 feet, alert, and with the prescribed unobstructed view to the maximum extent practicable. Authorized alternative methods and product-specific exceptions have their own conditions.
Source: 49 CFR 177.834(i)(3)(i); current eCFR text for covered operations, retrieved September 21, 2026; reviewed September 21, 2026. ↗
For ordinary in-person cargo-tank attendance, which person is qualified?
Correct answer: One trained for the hazards and emergencies and able and authorized to move it.
The attendant must know the material's hazards and emergency procedures and have authority and means to move the tank under this attendance method.
Source: 49 CFR 177.834(i)(4); current eCFR text for covered operations, retrieved September 21, 2026; reviewed September 21, 2026. ↗
An approved remote cargo-tank monitoring system loses its monitoring capability during transfer. What must happen?
Correct answer: Terminate transfer immediately and restore compliant attendance.
The remote-system alternative requires immediate termination on loss of monitoring capability. A qualified person must immediately resume the required in-person attendance after remote-system failure.
Source: 49 CFR 177.834(i)(3)(ii)(C), (E); current eCFR text for covered operations, retrieved September 21, 2026; reviewed September 21, 2026. ↗
An ordinary hazardous-liquid cargo tank still contains product. One manhole is unsecured. May it be driven a short distance to the exit?
Correct answer: No; secure the manhole before moving the tank.
The cargo-tank rule requires manhole closures closed and secured regardless of the quantity carried, subject to its stated empty-tank exception. A short distance is not itself an exception.
Source: 49 CFR 177.834(j); current eCFR text for covered operations, retrieved September 21, 2026; reviewed September 21, 2026. ↗
Two hazardous products each have correct papers. What else must be checked before placing them together in the same cargo space?
Correct answer: Whether the applicable segregation rules allow that combination.
Proper paperwork does not make incompatible products safe to load together. Check the applicable segregation rules and specific loading restrictions before combining hazardous cargo.
Source: South Carolina Commercial Driver License Manual, body March 2025; 9.4, mixed-load restrictions and Figure 9.9, printed 9-12; physical PDF page 128; reviewed September 21, 2026. ↗
A placarded vehicle requires attendance. The attendant is outside, 80 feet away, but a building blocks the view. Does this meet the attendance definition?
Correct answer: No; the vehicle must be in unobstructed view.
An outside attendant must be within 100 feet and have an unobstructed view. On the vehicle, the attendant must be awake and not in a sleeper berth.
Source: 49 CFR 397.5(d)(1); current eCFR text for covered operations, retrieved September 21, 2026; reviewed September 21, 2026. ↗
A placarded vehicle needs an attendant. Does a driver asleep in the sleeper berth satisfy the rule?
Correct answer: No; the on-vehicle attendant must be awake and outside the sleeper berth.
The attendance definition specifically excludes sleeping and the sleeper berth. Its alternative outside position requires distance and unobstructed-view conditions.
Source: 49 CFR 397.5(d)(1); current eCFR text for covered operations, retrieved September 21, 2026; reviewed September 21, 2026. ↗
What makes a parking area a safe haven for unattended Division 1.1, 1.2 or 1.3 loads?
Correct answer: Specific written approval by a local, state or federal authority.
Safe haven is a defined approval status, not a driver's description of a convenient place. The other applicable attendance conditions still matter.
Source: 49 CFR 397.5(b), (d)(3); current eCFR text for covered operations, retrieved September 21, 2026; reviewed September 21, 2026. ↗
A truck containing Division 1.2 material is parked four feet from the traveled part of a public highway. Is this allowed under the parking rule?
Correct answer: No; it cannot be parked on or within five feet.
172.504 identifies this hazard for placarding, and 397.7(a)(1) forbids parking on or within five feet of the traveled portion of a public street or highway.
Source: 49 CFR 397.7(a)(1); current eCFR text for covered operations, retrieved September 21, 2026; reviewed September 21, 2026. ↗
A driver of a placarded Class 3 vehicle wants to park within five feet of the traveled roadway for personal shopping. Does the brief operational-necessity exception cover that stop?
Correct answer: No; personal shopping is not the stated operational necessity.
The exception requires a brief operational necessity and impracticability of parking elsewhere. It does not provide a general convenience-parking exemption.
Source: 49 CFR 397.7(b); current eCFR text for covered operations, retrieved September 21, 2026; reviewed September 21, 2026. ↗
A Division 1.1 vehicle is to be parked 200 feet from a dwelling, with no qualifying operational necessity. Is that within the prohibited zone?
Correct answer: Yes; the rule uses 300 feet in these circumstances.
The rule restricts parking within 300 feet of bridges, tunnels, dwellings and places where people work or assemble, with a narrowly stated brief operational exception.
Source: 49 CFR 397.7(a)(3); current eCFR text for covered operations, retrieved September 21, 2026; reviewed September 21, 2026. ↗
Before parking a Division 1.3 vehicle on private property, what must the person in charge of that property know and provide?
Correct answer: Awareness of the hazardous contents and consent to park.
Knowledge and consent must come from the person in charge of the property, who must be aware of the nature of the hazardous materials.
Source: 49 CFR 397.7(a)(2); current eCFR text for covered operations, retrieved September 21, 2026; reviewed September 21, 2026. ↗
How close may a vehicle carrying covered hazardous materials be parked to an open fire under 397.11?
Correct answer: It must not be parked within 300 feet.
The parking restriction is 300 feet. Passing an open fire is a separate issue requiring precautions to establish that the vehicle can safely pass without stopping.
Source: 49 CFR 397.11(a)–(b); current eCFR text for covered operations, retrieved September 21, 2026; reviewed September 21, 2026. ↗
A placarded truck contains Class 3 flammable liquid. Someone stands 15 feet away with a lit cigarette. Is that far enough under the smoking rule?
Correct answer: No; the prohibited area extends to 25 feet.
397.13 prohibits smoking or carrying lit cigarettes, cigars or pipes on or within 25 feet of the listed hazardous-material vehicles.
Source: 49 CFR 397.13(a); current eCFR text for covered operations, retrieved September 21, 2026; reviewed September 21, 2026. ↗
