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 ↗
For federally regulated interstate CMV operation: A truck stops in a municipality's business district when lighted lamps are not required. What does the warning-device placement exception provide?
Correct answer: Placement is not required by that provision
The municipal business/residential exception applies to placement in this situation; it does not erase other applicable duties, including the flasher rule.
Source: 49 CFR 392.22(b)(2)(iii), distinguished from (a); federal text reviewed September 12, 2026; federally regulated interstate scope ↗
For federally regulated interstate CMV operation: A truck begins a trip with accessible, unsealed cargo that can be inspected. When is the first in-trip cargo and securement check required?
Correct answer: Within the first fifty miles
The initial in-trip check must be within fifty miles, with any necessary adjustments to prevent cargo movement or loss.
Source: 49 CFR 392.9(b)(2),(4); federal text reviewed September 12, 2026; federally regulated interstate scope ↗
For federally regulated interstate CMV operation: After the first inspection of accessible cargo, which events require reexamination during the trip?
Correct answer: Duty change, three driving hours, or 150 miles—whichever comes first
Each listed event independently triggers reexamination; necessary adjustments must also be made.
Source: 49 CFR 392.9(b)(3)(i)–(iii),(4); federal text reviewed September 12, 2026; federally regulated interstate scope ↗
For federally regulated interstate CMV operation: A truck's load is sealed and the driver has been ordered not to open it for inspection. Which duty is excepted?
Correct answer: The paragraph (b) cargo-inspection duties
The sealed-load exception concerns paragraph (b), not the general securement and unobstructed-cab requirements of paragraph (a).
Source: 49 CFR 392.9(a),(b)(4); federal text reviewed September 12, 2026; federally regulated interstate scope ↗
For federally regulated interstate CMV operation: A box is strapped securely inside an ordinary truck cab but blocks the driver's ready exit. What must change?
Correct answer: Move it so the driver's exit remains unobstructed
An object must not prevent free and ready exit from the cab, even if secured and outside the driver's forward view.
Source: 49 CFR 392.9(a)(3); ordinary truck; federal text reviewed September 12, 2026; federally regulated interstate scope ↗
For federally regulated interstate CMV operation: The freight is restrained, but the truck's spare tire and tarpaulin are unsecured. What is required?
Correct answer: Secure those operating items as well as the freight
The rule expressly includes spare tires, tarpaulins and other operating equipment, not just transported freight.
Source: 49 CFR 392.9(a)(2); federal text reviewed September 12, 2026; federally regulated interstate scope ↗
For federally regulated interstate CMV operation: Under the general tiedown-count rule, a seven-foot article is not blocked against forward movement. No special-purpose exception applies. What minimum number is required?
Correct answer: Two tiedowns
For an unblocked article longer than five feet but no longer than ten feet, the minimum is two regardless of weight. Other securement requirements still apply.
Source: 49 CFR 393.110(a),(b)(2)(ii),(d); federal text reviewed September 12, 2026; federally regulated interstate scope ↗
For federally regulated interstate CMV operation: An ordinary eight-foot article is properly blocked against forward movement. No special-purpose exception applies. Under the general count rule, how many tiedowns are required at minimum?
Correct answer: One tiedown
Proper forward blocking invokes at least one tiedown per ten feet or fraction. This count does not waive strength or other securement requirements.
Source: 49 CFR 393.110(a),(c),(d); federal text reviewed September 12, 2026; federally regulated interstate scope ↗
For federally regulated interstate CMV operation: A secured package blocks the right-side view from an ordinary truck's driving position. Does securement make its location acceptable?
Correct answer: No; the required side view must remain clear
Securement and required visibility are separate conditions. The self-steer-dolly exception is not involved.
Source: 49 CFR 392.9(a)(3); ordinary truck not self-steer dolly; federal text reviewed September 12, 2026; federally regulated interstate scope ↗
For federally regulated interstate CMV operation: A toolbox leaves the driver room to steer and exit but blocks ready access to required emergency accessories. Is its position acceptable?
Correct answer: No; required emergency accessories must stay accessible
Objects must not prevent free and ready access to required emergency accessories, independently of movement and exit clearance.
Source: 49 CFR 392.9(a)(3); federal text reviewed September 12, 2026; federally regulated interstate scope ↗
For federally regulated interstate CMV operation: An ordinary freight truck is outside the stop-required categories of 392.10. How must it approach a railroad grade crossing?
Correct answer: At a speed that allows stopping before the nearest rail
Even other CMVs must approach at a speed permitting a stop before the nearest rail.
Source: 49 CFR 392.11, full section; federal text reviewed September 12, 2026; federally regulated interstate scope ↗
For federally regulated interstate CMV operation: A freight truck outside the 392.10 categories has slowed at a grade crossing. What is necessary before driving over it?
Correct answer: Use due caution to establish that the course is clear
Slowing is not the entire duty: the driver must ascertain that the course is clear using due caution.
Source: 49 CFR 392.11, full section; federal text reviewed September 12, 2026; federally regulated interstate scope ↗
For federally regulated interstate CMV operation: Supplies in a truck cab restrict the driver's leg movement without blocking the windshield. Is that acceptable?
Correct answer: No; the driver's legs must move freely
The cargo rule separately protects free movement of the driver's arms and legs.
Source: 49 CFR 392.9(a)(3); federal text reviewed September 12, 2026; federally regulated interstate scope ↗
For federally regulated interstate CMV operation: A truck tire has no visible exposed cords, but air can be heard escaping. What does the tire rule permit?
Correct answer: Do not operate the vehicle on that tire
A flat tire or an audible leak is prohibited independently of exposed material or tread depth.
Source: 49 CFR 393.75(a)(3); federal text reviewed September 12, 2026; federally regulated interstate scope ↗
For federally regulated interstate CMV operation: An ordinary freight truck has a tire loaded above its marked capacity. It has no special state permit. What is required?
Correct answer: Correct the overload before operating the truck
The loading exception requires both a special state permit and the specified reduced-speed conditions. Lower speed alone does not authorize the overload.
Source: 49 CFR 393.75(g)(1)–(2); not manufactured-home transport; federal text reviewed September 12, 2026; federally regulated interstate scope ↗
For federally regulated interstate CMV operation: Which characteristic is required of the extinguishing agent in a truck's required extinguisher?
Correct answer: It does not need protection from freezing
The agent must not need protection from freezing; applicable toxicity requirements also remain.
Source: 49 CFR 393.95(a)(5); federal text reviewed September 12, 2026; federally regulated interstate scope ↗
For federally regulated interstate CMV operation: A truck's horn works, but the driver believes merely having it installed fulfills the equipment rule. What does the rule also require?
Correct answer: Use the listed equipment when and as needed
Section 392.7 covers both working condition and use of the listed equipment when needed.
Source: 49 CFR 392.7(a), opening language and horn entry; federal text reviewed September 12, 2026; federally regulated interstate scope ↗
For federally regulated interstate CMV operation: A report lists a defect on a towed unit no longer in your vehicle combination. Which specific acknowledgement exception applies?
Correct answer: The signature is not required for that detached unit's listed defects
Section 396.13(c) limits this signature exception to listed defects on a towed unit no longer in the combination.
Source: 49 CFR 396.13(c), final sentence; federal text reviewed September 12, 2026; federally regulated interstate scope ↗
For federally regulated interstate CMV operation: During acceptance of intermodal equipment, which hardware is specifically included in the driver's inspection?
Correct answer: Locking pins, clevises, clamps or hooks
The intermodal list includes the locking hardware; administrative cargo identifiers do not replace that equipment check.
Source: 49 CFR 392.7(b), locking hardware entry; federal text reviewed September 12, 2026; federally regulated interstate scope ↗
For federally regulated interstate CMV operation: A truck uses speed-restricted tires marked 55 mph under the federal provision. The posted road limit is 65 mph. Which maximum governs those tires?
Correct answer: 55 mph
The vehicle may not exceed the rated limit of tires labeled for a maximum of 55 mph or less under FMVSS 119 S6.5(e). A higher road limit does not override it.
Source: 49 CFR 393.75(f); federal text reviewed September 12, 2026; federally regulated interstate scope ↗
