For federally regulated interstate CMV operation: Before driving an interstate commercial truck, whose satisfaction with its safe operating condition is required even after a mechanic has worked on it?
Correct answer: The driver's
A repair visit does not remove the driver's pre-driving duty to be satisfied that the vehicle is safe.
Source: 49 CFR 396.13(a); eCFR current through September 10, 2026; interstate CMV scope ↗
For federally regulated interstate CMV operation: The last required inspection report lists a repaired defect on the interstate truck you will drive. What does your required report signature acknowledge?
Correct answer: Your review and the certification of required repairs
The signature acknowledges review of the report and the repair certification; it is not a claim that the driver acted as mechanic.
Source: 49 CFR 396.13(b)–(c); same vehicle, not a detached towed unit; eCFR current through September 10, 2026; interstate CMV scope ↗
For federally regulated interstate CMV operation: Under federal rules, may the driver-inspection reports for an interstate CMV be maintained electronically?
Correct answer: Yes, under the electronic-record requirements
Section 396.13(d) permits electronic reports in accordance with 49 CFR 390.32.
Source: 49 CFR 396.13(d), cross-reference 390.32; eCFR current through September 10, 2026; interstate CMV scope ↗
For federally regulated interstate CMV operation: Before taking intermodal equipment onto the road in interstate service, what brake inspection does the driver rule describe?
Correct answer: A thorough visible-component check without crawling underneath
The intermodal inspection covers readily visible service-brake components and trailer connections, without requiring the driver to physically go underneath.
Source: 49 CFR 392.7(b), service-brake-components bullet; eCFR current through September 10, 2026; interstate CMV scope ↗
For federally regulated interstate CMV operation: An interstate truck tire has belt material exposed through a sidewall cut. What do federal tire rules permit?
Correct answer: Do not operate the vehicle on that tire
Exposed ply or belt material is a prohibited tire condition, independent of tread depth.
Source: 49 CFR 393.75(a)(1),(4); eCFR current through September 10, 2026; interstate CMV scope ↗
For federally regulated interstate CMV operation: What is the federal minimum major-groove tread depth for the front tires of an interstate truck?
Correct answer: 4/32 inch
Measure in a major groove, not at tie bars, humps or fillets; front truck tires require at least 4/32 inch.
Source: 49 CFR 393.75(b); eCFR current through September 10, 2026; interstate CMV scope ↗
For federally regulated interstate CMV operation: For an interstate truck's rear tires, what is the federal minimum major-groove tread depth?
Correct answer: 2/32 inch
The general non-front-position minimum is 2/32 inch, measured away from tie bars, humps and fillets.
Source: 49 CFR 393.75(c), contrasted with (b); eCFR current through September 10, 2026; interstate CMV scope ↗
For federally regulated interstate CMV operation: An ordinary truck's windshield wipers do not work. Which statement matches the driver's equipment duty?
Correct answer: The wipers must be in good working order
The listed pre-driving equipment includes windshield wipers. A forecast does not remove that check.
Source: 49 CFR 392.7(a), windshield-wiper entry; eCFR current through September 10, 2026 ↗
For federally regulated interstate CMV operation: An interstate truck tire's cold pressure is below that specified for its load. What must happen before operation on that tire?
Correct answer: Correct the underinflation for the load
Federal rules prohibit operation with cold tire pressure below that specified for the carried load.
Source: 49 CFR 393.75(i)(1); eCFR current through September 10, 2026; interstate CMV scope ↗
For federally regulated interstate CMV operation: An interstate truck is not carrying hazardous materials and is not in a driveaway-towaway operation. Which extinguisher option meets the federal minimum rating?
Correct answer: One rated at least 5 B:C
One 5 B:C extinguisher or two extinguishers each rated at least 4 B:C meet the stated non-hazmat rating option.
Source: 49 CFR 393.95 opening scope; (a)(1)(ii),(a)(6); eCFR current through September 10, 2026; interstate CMV scope ↗
For federally regulated interstate CMV operation: How must a required truck fire extinguisher identify its UL rating?
Correct answer: By a manufacturer label or marking
The rule calls for the manufacturer's rating label or marking, not an estimate.
Source: 49 CFR 393.95(a)(2); eCFR current through September 10, 2026 ↗
For federally regulated interstate CMV operation: How must the required extinguisher be carried in an ordinary interstate commercial truck?
Correct answer: Readily accessible and securely mounted
It must be filled, accessible, and mounted against sliding, rolling or vertical movement.
Source: 49 CFR 393.95(a)(4); eCFR current through September 10, 2026; interstate CMV scope ↗
For federally regulated interstate CMV operation: What must the required interstate-truck extinguisher allow you to determine visually?
Correct answer: Whether it is fully charged
The extinguisher must permit visual determination of its charged condition.
Source: 49 CFR 393.95(a)(3); eCFR current through September 10, 2026; interstate CMV scope ↗
For federally regulated interstate CMV operation: Which is a complete federal reflective-warning-device option for an ordinary interstate truck?
Correct answer: Three compliant bidirectional reflective triangles
Three triangles conforming to FMVSS 125 are a listed option; personal visibility gear does not replace a required device.
Source: 49 CFR 393.95(f)(1),(3); eCFR current through September 10, 2026; interstate CMV scope ↗
For federally regulated interstate CMV operation: Fuel is leaking from a disabled truck on a highway. What restriction applies before placing a flame-producing warning signal?
Correct answer: Keep it far enough from the leak to prevent ignition
Leaking flammable material creates an ignition hazard. Do not light or place a flame signal where it could ignite the leak.
Source: 49 CFR 392.22(b)(2)(vi); eCFR current through September 10, 2026 ↗
For federally regulated interstate CMV operation: Your interstate truck breaks down on a highway shoulder, not at a necessary traffic stop. What is required immediately?
Correct answer: Activate its hazard warning flashers
Flashers are the immediate signal; warning-device placement is a separate duty.
Source: 49 CFR 392.22(a); eCFR current through September 10, 2026; interstate CMV scope ↗
For federally regulated interstate CMV operation: An interstate truck stops on a rural highway shoulder where warning devices are required. When must they be placed?
Correct answer: As soon as possible, within ten minutes
Ten minutes is the outer limit, not a routine waiting period.
Source: 49 CFR 392.22(b)(1); no (b)(2) exception in scenario; eCFR current through September 10, 2026; interstate CMV scope ↗
For federally regulated interstate CMV operation: Required triangles are available after an interstate truck breaks down. Can hazard flashers replace their placement?
Correct answer: No; flashers are not a substitute for required devices
The rule permits flashers in addition to, not instead of, required warning devices.
Source: 49 CFR 392.22(a), final sentence; eCFR current through September 10, 2026; interstate CMV scope ↗
For federally regulated interstate CMV operation: An interstate truck stops on a straight divided-highway shoulder with no nearby sight obstruction. Where do the two farther warning devices go?
Correct answer: 100 and 200 feet toward approaching traffic
The divided-road arrangement puts the farther devices toward approaching traffic; another goes on the traffic side within ten feet of the rear.
Source: 49 CFR 392.22(b)(2)(v); unobstructed divided-road scenario; eCFR current through September 10, 2026; interstate CMV scope ↗
For federally regulated interstate CMV operation: An interstate truck is stopped within 500 feet of a hillcrest hiding it from approaching drivers. How is the warning device toward that obstruction positioned?
Correct answer: 100–500 feet from the truck to provide ample warning
A nearby hill, curve or obstruction changes placement of the warning signal in that direction.
Source: 49 CFR 392.22(b)(2)(iv); eCFR current through September 10, 2026; interstate CMV scope ↗
