For federally regulated interstate CMV operation: A repaired freight truck is ready for collection. Who must still be satisfied that it is safe before driving?
Correct answer: The driver taking the truck
The driver's own pre-driving duty remains even after repairs.
Source: 49 CFR 396.13(a); federal text reviewed September 12, 2026; federally regulated interstate scope ↗
For federally regulated interstate CMV operation: The last required report lists a defect repaired on the truck you will drive. What does signing the reviewed report acknowledge?
Correct answer: Report review and certification of the required repair
The signature acknowledges review and repair certification, not that the driver performed the repair.
Source: 49 CFR 396.13(b)–(c); federal text reviewed September 12, 2026; federally regulated interstate scope ↗
For federally regulated interstate CMV operation: A carrier wants to keep its required driver-inspection reports digitally. Which statement is correct?
Correct answer: Electronic reports are allowed under the applicable recordkeeping rule
Section 396.13(d) permits electronic creation and maintenance in accordance with 390.32; this does not waive that rule's requirements.
Source: 49 CFR 396.13(d); federal text reviewed September 12, 2026; federally regulated interstate scope ↗
For federally regulated interstate CMV operation: Before accepting intermodal equipment, what does the driver's specified service-brake inspection involve?
Correct answer: Thoroughly inspect visible components without going underneath
The rule describes as thorough a visual inspection as possible without physically going under the vehicle, including trailer brake connections.
Source: 49 CFR 392.7(b), service-brake components; federal text reviewed September 12, 2026; federally regulated interstate scope ↗
For federally regulated interstate CMV operation: A truck tire has a cut exposing its belt material, although its tread is deep. What is permitted?
Correct answer: Do not operate the truck on that tire
Exposed ply or belt material is itself a prohibited condition; adequate tread or pressure does not cure it.
Source: 49 CFR 393.75(a)(1),(4); federal text reviewed September 12, 2026; federally regulated interstate scope ↗
For federally regulated interstate CMV operation: On a truck's front tire, what minimum depth is required at a major tread groove, away from tie bars, humps and fillets?
Correct answer: 4/32 inch
The front wheels of trucks, truck tractors and buses have a 4/32-inch minimum measured at the specified groove locations.
Source: 49 CFR 393.75(b); federal text reviewed September 12, 2026; federally regulated interstate scope ↗
For federally regulated interstate CMV operation: What minimum major-groove tread depth applies to an ordinary freight truck's rear tires, away from tie bars, humps and fillets?
Correct answer: 2/32 inch
For these non-front tire positions the federal minimum is 2/32 inch.
Source: 49 CFR 393.75(c); federal text reviewed September 12, 2026; federally regulated interstate scope ↗
For federally regulated interstate CMV operation: A truck's wipers have failed, but the forecast is dry. What is the driver's equipment obligation before departure?
Correct answer: Ensure the wipers are in working order
Windshield wipers are among the equipment that must be in good working order; the forecast does not remove that duty.
Source: 49 CFR 392.7(a), windshield wipers; federal text reviewed September 12, 2026; federally regulated interstate scope ↗
For federally regulated interstate CMV operation: Before loading out, a driver's cold tire-pressure reading is below the pressure specified for the load. What should be done?
Correct answer: Correct the underinflation before operation
A vehicle may not operate on a tire whose cold pressure is below that specified for the carried load.
Source: 49 CFR 393.75(i)(1); federal text reviewed September 12, 2026; federally regulated interstate scope ↗
For federally regulated interstate CMV operation: An ordinary truck carries no hazardous materials and is not in driveaway-towaway service. Which single-extinguisher rating meets the federal minimum?
Correct answer: 5 B:C
For this scenario, one extinguisher rated at least 5 B:C is an option. Two rated at least 4 B:C each are the alternative.
Source: 49 CFR 393.95 introductory scope; (a)(1)(ii),(a)(6); federal text reviewed September 12, 2026; federally regulated interstate scope ↗
For federally regulated interstate CMV operation: How must a required extinguisher's Underwriters' Laboratories rating be identified?
Correct answer: By its manufacturer's label or marking
The extinguisher must carry the manufacturer's rating label or marking.
Source: 49 CFR 393.95(a)(2); federal text reviewed September 12, 2026; federally regulated interstate scope ↗
For federally regulated interstate CMV operation: Which storage arrangement satisfies the location and mounting requirement for a filled truck extinguisher?
Correct answer: Accessible for use and secured against movement
Both ready access and secure mounting are required; satisfying one does not excuse the other.
Source: 49 CFR 393.95(a)(4); federal text reviewed September 12, 2026; federally regulated interstate scope ↗
For federally regulated interstate CMV operation: What condition must a required extinguisher allow the driver to determine visually?
Correct answer: Whether the extinguisher is fully charged
Its design, construction and maintenance must permit visual determination of charged condition.
Source: 49 CFR 393.95(a)(3); federal text reviewed September 12, 2026; federally regulated interstate scope ↗
For federally regulated interstate CMV operation: Which set is a complete reflective-triangle equipment option for an ordinary truck?
Correct answer: Three compliant bidirectional reflective triangles
The listed option is three triangles meeting FMVSS 125. Other warning items may supplement, not replace, required devices.
Source: 49 CFR 393.95(f)(1),(3); federal text reviewed September 12, 2026; federally regulated interstate scope ↗
For federally regulated interstate CMV operation: An ordinary diesel truck leaks fuel after stopping on a highway. What applies before lighting or placing a flame-producing warning signal?
Correct answer: Keep it far enough from the leak to prevent ignition
A flame signal must not be lighted or placed where leaking flammable material could cause fire or explosion. This is not advice to choose a flame over a suitable non-flame device.
Source: 49 CFR 392.22(b)(2)(vi); federal text reviewed September 12, 2026; federally regulated interstate scope ↗
For federally regulated interstate CMV operation: A truck stops on a highway shoulder because of a breakdown, not a necessary traffic stop. What signal action is required immediately?
Correct answer: Activate the truck's hazard warning flashers
Hazard flashers provide the immediate warning; required device placement is a separate duty.
Source: 49 CFR 392.22(a); federal text reviewed September 12, 2026; federally regulated interstate scope ↗
For federally regulated interstate CMV operation: A truck breaks down on a rural highway shoulder where the general warning-device rule applies. When must the devices be placed?
Correct answer: As soon as possible, within ten minutes
Ten minutes is the outside deadline, not permission to wait when earlier placement is possible.
Source: 49 CFR 392.22(b)(1); no special exception; federal text reviewed September 12, 2026; federally regulated interstate scope ↗
For federally regulated interstate CMV operation: Where warning triangles are required after a truck breakdown, how do the flashers affect that requirement?
Correct answer: They supplement rather than replace the required triangles
The regulation expressly permits flashers in addition to, not instead of, required warning devices.
Source: 49 CFR 392.22(a), final sentence; federal text reviewed September 12, 2026; federally regulated interstate scope ↗
For federally regulated interstate CMV operation: A truck is disabled on a straight divided-highway shoulder with clear sight distance. Where do the two farther warning devices belong?
Correct answer: 100 and 200 feet toward approaching traffic
On divided or one-way roads, the farther devices warn approaching traffic at 100 and 200 feet. The third is on the traffic side within ten feet of the rear.
Source: 49 CFR 392.22(b)(2)(v); federal text reviewed September 12, 2026; federally regulated interstate scope ↗
For federally regulated interstate CMV operation: A truck is stopped within 500 feet of a hillcrest that hides it from approaching traffic. Where should the warning signal toward that obstruction go?
Correct answer: 100–500 feet away, positioned to give ample warning
The special obstruction rule requires a position between 100 and 500 feet that gives other highway users ample warning.
Source: 49 CFR 392.22(b)(2)(iv); federal text reviewed September 12, 2026; federally regulated interstate scope ↗
