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CDL general-knowledge questions marathon

Selected knowledge practice, not a complete licensing course or practical training.

Virginia CDL General Knowledge Marathon

Practice mode
Question 1 of 52
  1. 1. A truck's brake linings still have substantial thickness, but oil has soaked into the friction surfaces. What does that finding mean?
  2. 2. A driver notices one broken leaf in a truck's leaf-spring assembly. The remaining leaves appear intact. Which conclusion is sound?
  3. 3. An exhaust pipe is firmly attached but rubs against a fuel-system component when the truck vibrates. What should the driver recognize?
  4. 4. A reusable bottle has rolled out of its holder and is loose on the cab floor before departure. Why should it be secured?
  5. 5. A truck must start moving on a surface with limited traction, and the route is safe to use. Which use of the accelerator best reduces wheelspin?
  6. 6. A driver is assigned a manual-transmission truck with a different engine and transmission from the usual vehicle. How should the driver establish its shifting range?
  7. 7. A truck has a conventional driver-controlled retarder that slows its drive wheels. The road ahead is icy. What is the concern with leaving that retarder active?
  8. 8. A driver watches the road far ahead so intently that nearby traffic changes are being missed. What would improve the search pattern?
  9. 9. A car looks small in the truck's curved, convex mirror. What should the driver keep in mind when judging its position?
  10. 10. While traveling in traffic, a driver wants to monitor a car behind the truck. Which approach best preserves awareness ahead?
  11. 11. A truck is approaching a driveway where it will need to slow substantially. The truck blocks the following driver's view of that driveway. What helps the following driver respond?
  12. 12. A following driver gestures as if asking the truck driver whether it is safe to pass. What is the truck driver's safest response?
  13. 13. A driver estimates stopping space using only the distance traveled after the brake pedal is pressed. What important travel is missing?
  14. 14. On a cold morning near freezing, a dark road patch looks merely wet. What should a truck driver consider before reaching it?
  15. 15. A high-center-of-gravity truck approaches a curve with a posted advisory speed. Why might the driver need to enter more slowly than that value?
  16. 16. Nearby cars are exceeding the speed limit, and a truck driver feels pressured to match them. Which decision is appropriate?
  17. 17. A reduced-speed work zone continues for several miles. Traffic feels steady, but the truck's speed has gradually increased. What habit helps prevent this drift?
  18. 18. A car is following a truck too closely. What change can help the truck driver avoid having to brake abruptly?
  19. 19. A car has remained beside the truck for a long distance. Why should the truck driver seek a safe opportunity to regain open space beside the vehicle?
  20. 20. A van-bodied truck's suspension settles lower when it is heavily loaded. It cleared a low opening while loaded yesterday and is empty today. What should the driver conclude?
  21. 21. A loaded straight truck has low ground clearance and must cross a sharply dipped driveway entrance. What needs to be established before proceeding?
  22. 22. Before a tight right turn, a truck driver is considering swinging far left on the approach. What traffic hazard can that create?
  23. 23. A long, heavily loaded straight truck is waiting to cross a road from a stop. Why might a gap that works for a car be inadequate for this truck?
  24. 24. A small cardboard box is in the truck's path. It looks light, but the driver cannot see inside it. What is the sound assessment?
  25. 25. The paved lane ends beside a soft shoulder that is lower than the roadway. Why does that edge deserve special attention in a tall truck?
  26. 26. A nearby car varies its speed and drifts within its lane while its driver repeatedly looks down. How should the truck driver treat that situation?
  27. 27. A driver is unfamiliar with the day's destination and has not entered it into the navigation system. When should that setup be completed?
  28. 28. An impatient driver gestures angrily and tries to get ahead of the truck. There is a safe way to let the vehicle go. What should the truck driver do?
  29. 29. In fog, a truck driver sees a pair of taillights ahead but cannot clearly see the roadway around them. Why is simply following those lights unsafe?
  30. 30. A truck is fitted with radiator shutters and a winterfront. A driver proposes closing them as much as possible because the weather is very cold. What risk is being overlooked?
  31. 31. A truck's tires were set correctly when cold. After highway travel in hot weather, the pressure is higher, and a coworker suggests releasing air to restore the cold reading. Why should the driver reject that suggestion?
  32. 32. The coolant-temperature gauge on a conventional diesel truck rises above the manufacturer's highest safe temperature during travel. What is the appropriate response?
  33. 33. A train has just cleared one of two parallel tracks at a crossing. What danger must the truck driver still check for before crossing when permitted?
  34. 34. A driver knows a long, steep downgrade is ahead in a conventional geared truck. What should be settled before the truck starts down?
  35. 35. A truck's ABS is working, but a known mechanical brake defect has not been corrected. Which statement best describes the protection ABS provides?
  36. 36. A truck's yellow ABS malfunction lamp comes on during the trip, well after its normal startup check. What does that signal mean?
  37. 37. A truck driver who was not involved in a crash has a safe place to stop and assist. Why should the truck be parked away from the immediate crash area?
  38. 38. An interstate CMV driver is moving in traffic. Dispatch asks for an ordinary scheduling call using a phone held in the driver's hand. No emergency is involved. Which statement applies?
  39. 39. An interstate CMV is temporarily stopped at a red light with its engine running. The driver wants to type a routine text to dispatch. How does the federal texting rule treat this situation?
  40. 40. An interstate CMV driver is safely parked but is too fatigued to begin the next leg safely. Dispatch says the delivery deadline cannot move. No grave emergency exists. What must the driver do?
  41. 41. A truck's exhaust pipe is still firmly mounted, but a joint is leaking near the cab. Why does secure mounting alone not make this condition safe?
  42. 42. A truck is safely parked after startup. Its engine oil pressure stays below the manufacturer's normal range and the low-pressure warning remains on. What should the driver do?
  43. 43. In a clear loading yard, either of two approved approaches would let a driver back the same truck into a space. Why favor the approach that turns toward the driver's side?
  44. 44. A driver and a yard helper have not worked together before. Before the truck begins backing, what should they establish about hand signals?
  45. 45. On an unlit road, a truck's low beams reveal less roadway than the distance it would need to stop at its present speed. What adjustment is needed?
  46. 46. An approaching vehicle's headlights create glare on a dark two-way road. A right edge marking is visible. Where should the truck driver direct their view instead of staring into those headlights?
  47. 47. After unloading a box truck, a driver will leave a sheltered tunnel into strong side winds. What should the driver recognize about the lighter vehicle?
  48. 48. A truck enters water or slush and begins hydroplaning. Why may its steering and brakes no longer respond normally even though the controls still work?
  49. 49. After hearing a possible tire blowout, a driver has brought a truck with dual rear tires to a secure place where an outside inspection can be made safely. The truck did not fishtail. What should happen next?
  50. 50. A truck's brakes have failed on a long downgrade. A designated truck escape ramp is available ahead and its entrance is clear and reachable. Which choice fits that emergency?
  51. 51. A truck's front tires have lost their grip in a turn. The front of the truck keeps sliding nearly straight even as the driver adds steering angle. What explains this behavior?
  52. 52. A driver is assigned a truck with working ABS and suggests reducing the usual safe following gap because the truck must now stop in less distance. Which response is sound?
Review all 52 questions with answers

  1. A truck's brake linings still have substantial thickness, but oil has soaked into the friction surfaces. What does that finding mean?

    Correct answer: The contamination is a brake defect even though the linings are thick

    Oil on brake friction surfaces is a defect. Adequate lining thickness does not cancel the need to address contamination before relying on those brakes.

    Source: Virginia Commercial Driver's License Manual, Modernized Testing System, Version 07/20/2026; Section 2 Driving Safely, physical 20, printed 2-2; 2.1.3 What to Look For—Bad Brake Drums or Shoes. ↗

  2. A driver notices one broken leaf in a truck's leaf-spring assembly. The remaining leaves appear intact. Which conclusion is sound?

    Correct answer: A broken leaf is a suspension defect that needs attention

    The manual identifies broken spring leaves as dangerous defects. A level appearance or intact neighboring leaves is not a reason to dismiss a broken leaf.

    Source: Virginia Commercial Driver's License Manual, Modernized Testing System, Version 07/20/2026; Section 2 Driving Safely, physical 20, printed 2-2; 2.1.3 What to Look For—Suspension System Defects. ↗

  3. An exhaust pipe is firmly attached but rubs against a fuel-system component when the truck vibrates. What should the driver recognize?

    Correct answer: The contact is an exhaust-system defect needing correction

    Exhaust-system parts must not rub against fuel-system parts, tires, or other moving parts. A secure mounting does not make harmful contact acceptable.

    Source: Virginia Commercial Driver's License Manual, Modernized Testing System, Version 07/20/2026; Section 2 Driving Safely, physical 21, printed 2-3; 2.1.3 What to Look For—Exhaust System Defects. ↗

  4. A reusable bottle has rolled out of its holder and is loose on the cab floor before departure. Why should it be secured?

    Correct answer: It could move into the controls or strike the driver

    Loose cab articles can interfere with vehicle controls or strike the driver during a stop or crash. Secure the bottle instead of relying on where it happens to rest.

    Source: Virginia Commercial Driver's License Manual, Modernized Testing System, Version 07/20/2026; Section 2 Driving Safely, physical 25, printed 2-7; 2.1.5 Seven-Step Inspection Method—Step 6: Check Signal Lights, Get In Vehicle. ↗

  5. A truck must start moving on a surface with limited traction, and the route is safe to use. Which use of the accelerator best reduces wheelspin?

    Correct answer: Build power gently and progressively

    Smooth, gradual acceleration helps the drive tires maintain traction. Abrupt power application can make them spin on a slippery surface.

    Source: Virginia Commercial Driver's License Manual, Modernized Testing System, Version 07/20/2026; Section 2 Driving Safely, physical 26, printed 2-8; 2.2.1 Accelerating. ↗

  6. A driver is assigned a manual-transmission truck with a different engine and transmission from the usual vehicle. How should the driver establish its shifting range?

    Correct answer: Learn that vehicle's operating range and manufacturer guidance

    Engine operating ranges and appropriate shifting methods vary. Learn the assigned vehicle rather than treating one truck's shift points as universal.

    Source: Virginia Commercial Driver's License Manual, Modernized Testing System, Version 07/20/2026; Section 2 Driving Safely, physical 27, printed 2-9; 2.3.1 Manual Transmissions—Basic Method for Shifting Up. ↗

  7. A truck has a conventional driver-controlled retarder that slows its drive wheels. The road ahead is icy. What is the concern with leaving that retarder active?

    Correct answer: It can make the drive wheels skid on the low-traction surface

    A conventional drive-wheel retarder can cause a skid when traction is poor. The manual calls for turning this type of retarder off on slippery roads; know the vehicle's controls and manufacturer instructions.

    Source: Virginia Commercial Driver's License Manual, Modernized Testing System, Version 07/20/2026; Section 2 Driving Safely, physical 28, printed 2-10; 2.3.4 Retarders. ↗

  8. A driver watches the road far ahead so intently that nearby traffic changes are being missed. What would improve the search pattern?

    Correct answer: Alternate attention between the distance and the area nearer the truck

    Looking well ahead provides planning time, but the manual also calls for shifting attention between near and far areas. Fixating on either misses important information.

    Source: Virginia Commercial Driver's License Manual, Modernized Testing System, Version 07/20/2026; Section 2 Driving Safely, physical 28, printed 2-10; 2.4.1 Seeing Ahead. ↗

  9. A car looks small in the truck's curved, convex mirror. What should the driver keep in mind when judging its position?

    Correct answer: The mirror can make the car seem farther away than it is

    Convex mirrors widen the view but make objects look smaller and farther away. Do not treat the apparent distance as an undistorted measurement.

    Source: Virginia Commercial Driver's License Manual, Modernized Testing System, Version 07/20/2026; Section 2 Driving Safely, physical 29, printed 2-11; 2.4.2 Seeing to the Sides and Rear—Use Mirrors Properly. ↗

  10. While traveling in traffic, a driver wants to monitor a car behind the truck. Which approach best preserves awareness ahead?

    Correct answer: Use brief mirror glances and promptly return attention to the road ahead

    Mirror checks are essential, but they should be brief while moving. Long looks away from the road ahead can allow a developing hazard to go unnoticed.

    Source: Virginia Commercial Driver's License Manual, Modernized Testing System, Version 07/20/2026; Section 2 Driving Safely, physical 29, printed 2-11; 2.4.2 Seeing to the Sides and Rear—Use Mirrors Properly. ↗

  11. A truck is approaching a driveway where it will need to slow substantially. The truck blocks the following driver's view of that driveway. What helps the following driver respond?

    Correct answer: Signal the planned turn early and reduce speed gradually

    Following drivers may not see the reason for a truck's slowdown. Early signaling and gradual slowing give them more warning and time to adjust.

    Source: Virginia Commercial Driver's License Manual, Modernized Testing System, Version 07/20/2026; Section 2 Driving Safely, physical 30, printed 2-12; 2.5.1 Signal Your Intentions—Slowing Down. ↗

  12. A following driver gestures as if asking the truck driver whether it is safe to pass. What is the truck driver's safest response?

    Correct answer: Avoid giving a signal that promises the pass is safe

    Do not direct another driver to pass. That driver must assess the complete passing situation; the truck driver should not give an assurance that can be misunderstood.

    Source: Virginia Commercial Driver's License Manual, Modernized Testing System, Version 07/20/2026; Section 2 Driving Safely, physical 30, printed 2-12; 2.5.1 Signal Your Intentions—Don't Direct Traffic. ↗

  13. A driver estimates stopping space using only the distance traveled after the brake pedal is pressed. What important travel is missing?

    Correct answer: Travel while recognizing the hazard and reacting to it

    Total stopping distance includes perception and reaction travel as well as braking distance. Sound brakes do not eliminate the distance covered before brake application.

    Source: Virginia Commercial Driver's License Manual, Modernized Testing System, Version 07/20/2026; Section 2 Driving Safely, physical 32, printed 2-14; 2.6.1 Stopping Distance. ↗

  14. On a cold morning near freezing, a dark road patch looks merely wet. What should a truck driver consider before reaching it?

    Correct answer: A thin, transparent ice layer may be present

    Black ice can make pavement look wet rather than frozen. Nearby traction and the absence of visible snow do not establish that the patch is safe.

    Source: Virginia Commercial Driver's License Manual, Modernized Testing System, Version 07/20/2026; Section 2 Driving Safely, physical 33, printed 2-15; 2.6.2 Matching Speed to the Road Surface—Slippery Surfaces. ↗

  15. A high-center-of-gravity truck approaches a curve with a posted advisory speed. Why might the driver need to enter more slowly than that value?

    Correct answer: The truck's load and stability may require a lower safe speed

    Posted curve speeds may be too high for some large vehicles. Reduce speed before entry to suit the vehicle, load, and conditions rather than treating the sign as a stability guarantee.

    Source: Virginia Commercial Driver's License Manual, Modernized Testing System, Version 07/20/2026; Section 2 Driving Safely, physical 33, printed 2-15; 2.6.3 Speed and Curves. ↗

  16. Nearby cars are exceeding the speed limit, and a truck driver feels pressured to match them. Which decision is appropriate?

    Correct answer: Keep a speed that is both lawful and safe for the conditions

    Matching traffic flow is useful only when that speed is legal and safe. Other drivers' speeding does not justify exceeding a safe or lawful speed.

    Source: Virginia Commercial Driver's License Manual, Modernized Testing System, Version 07/20/2026; Section 2 Driving Safely, physical 33, printed 2-15; 2.6.5 Speed and Traffic Flow. ↗

  17. A reduced-speed work zone continues for several miles. Traffic feels steady, but the truck's speed has gradually increased. What habit helps prevent this drift?

    Correct answer: Check the speedometer regularly while monitoring the work zone

    Drivers can unintentionally creep back toward normal speed in long work zones. Periodic speedometer checks help maintain the appropriate reduced speed while attention remains on changing conditions.

    Source: Virginia Commercial Driver's License Manual, Modernized Testing System, Version 07/20/2026; Section 2 Driving Safely, physical 34, printed 2-16; 2.6.7 Roadway Work Zones. ↗

  18. A car is following a truck too closely. What change can help the truck driver avoid having to brake abruptly?

    Correct answer: Create more space ahead and make speed changes smoothly

    More space ahead gives the truck driver room to slow gradually. Speeding up or trying to startle a tailgater can make the situation more dangerous.

    Source: Virginia Commercial Driver's License Manual, Modernized Testing System, Version 07/20/2026; Section 2 Driving Safely, physical 35, printed 2-17; 2.7.2 Space Behind—Dealing with Tailgaters Safely. ↗

  19. A car has remained beside the truck for a long distance. Why should the truck driver seek a safe opportunity to regain open space beside the vehicle?

    Correct answer: Side-by-side travel reduces room for either vehicle to avoid a hazard

    Avoid unnecessary prolonged side-by-side travel. It leaves less room if either driver changes lanes or must avoid a hazard.

    Source: Virginia Commercial Driver's License Manual, Modernized Testing System, Version 07/20/2026; Section 2 Driving Safely, physical 35, printed 2-17; 2.7.3 Space to the Sides. ↗

  20. A van-bodied truck's suspension settles lower when it is heavily loaded. It cleared a low opening while loaded yesterday and is empty today. What should the driver conclude?

    Correct answer: Yesterday's passage does not establish today's overhead clearance

    Some vehicles ride higher after unloading. Know the truck's current height and the actual clearance; a previous loaded trip does not prove that an empty truck will fit.

    Source: Virginia Commercial Driver's License Manual, Modernized Testing System, Version 07/20/2026; Section 2 Driving Safely, physical 36, printed 2-18; 2.7.4 Space Overhead. ↗

  21. A loaded straight truck has low ground clearance and must cross a sharply dipped driveway entrance. What needs to be established before proceeding?

    Correct answer: That the truck's underside can clear the change in surface angle

    A truck can hang up underneath on a dip or drainage channel even when the width and overhead clearance are adequate. Check the clearance below the vehicle for the whole path.

    Source: Virginia Commercial Driver's License Manual, Modernized Testing System, Version 07/20/2026; Section 2 Driving Safely, physical 36, printed 2-18; 2.7.5 Space Below. ↗

  22. Before a tight right turn, a truck driver is considering swinging far left on the approach. What traffic hazard can that create?

    Correct answer: A following driver may try to enter the opening on the truck's right

    A wide left swing before a right turn can invite another vehicle into the space on the truck's right. Plan the turn for the actual space and keep watching for traffic; this is not permission to use a lane unlawfully.

    Source: Virginia Commercial Driver's License Manual, Modernized Testing System, Version 07/20/2026; Section 2 Driving Safely, physical 36, printed 2-18; 2.7.6 Space for Turns—Right Turns. ↗

  23. A long, heavily loaded straight truck is waiting to cross a road from a stop. Why might a gap that works for a car be inadequate for this truck?

    Correct answer: The truck accelerates more slowly and takes longer to clear the entire roadway

    Large, heavy vehicles generally need larger traffic gaps because of slower acceleration and greater length. The gap must allow the entire vehicle to clear, not just the cab.

    Source: Virginia Commercial Driver's License Manual, Modernized Testing System, Version 07/20/2026; Section 2 Driving Safely, physical 37, printed 2-19; 2.7.7 Space Needed to Cross or Enter Traffic. ↗

  24. A small cardboard box is in the truck's path. It looks light, but the driver cannot see inside it. What is the sound assessment?

    Correct answer: It may conceal a solid object capable of damaging the truck

    An apparently light container may hide something solid. Road debris can damage tires, wheels, or vehicle components, so do not assume it is safe to run over.

    Source: Virginia Commercial Driver's License Manual, Modernized Testing System, Version 07/20/2026; Section 2 Driving Safely, physical 37, printed 2-19; 2.8.2 Hazardous Roads—Foreign Objects. ↗

  25. The paved lane ends beside a soft shoulder that is lower than the roadway. Why does that edge deserve special attention in a tall truck?

    Correct answer: A wheel dropping off can tilt the truck toward nearby overhead objects

    A road-edge drop can tilt a truck, potentially bringing its upper body into branches or other objects. This question concerns recognizing the hazard, not a universal recovery maneuver.

    Source: Virginia Commercial Driver's License Manual, Modernized Testing System, Version 07/20/2026; Section 2 Driving Safely, physical 37, printed 2-19; 2.8.2 Hazardous Roads—Drop Off. ↗

  26. A nearby car varies its speed and drifts within its lane while its driver repeatedly looks down. How should the truck driver treat that situation?

    Correct answer: Leave extra room and expect the car may drift without noticing the truck

    Visible distraction and inconsistent vehicle position call for more room. The other driver may not be aware of the truck and may move into its path.

    Source: Virginia Commercial Driver's License Manual, Modernized Testing System, Version 07/20/2026; Section 2 Driving Safely, physical 42, printed 2-24; 2.9.7 Watch Out for Other Distracted Drivers. ↗

  27. A driver is unfamiliar with the day's destination and has not entered it into the navigation system. When should that setup be completed?

    Correct answer: While safely parked before beginning the trip

    Review the route and program navigation before driving. A low speed or apparently simple traffic situation does not remove the distraction of entering a destination.

    Source: Virginia Commercial Driver's License Manual, Modernized Testing System, Version 07/20/2026; Section 2 Driving Safely, physical 42, printed 2-24; 2.9.6 Don't Drive Distracted. ↗

  28. An impatient driver gestures angrily and tries to get ahead of the truck. There is a safe way to let the vehicle go. What should the truck driver do?

    Correct answer: Let the driver go without competing or responding to the gestures

    Do not challenge an aggressive driver by competing for position or reacting to gestures. Use a safe opportunity to let that vehicle move away.

    Source: Virginia Commercial Driver's License Manual, Modernized Testing System, Version 07/20/2026; Section 2 Driving Safely, physical 42, printed 2-24; 2.10.3 What You Should Do When Confronted by an Aggressive Driver. ↗

  29. In fog, a truck driver sees a pair of taillights ahead but cannot clearly see the roadway around them. Why is simply following those lights unsafe?

    Correct answer: The vehicle showing the lights may be stopped off the roadway

    Lights seen through fog may belong to a vehicle beside the road. They are not reliable proof of the lane's path or a safe route; reduce speed and seek a safe place to wait if visibility is inadequate.

    Source: Virginia Commercial Driver's License Manual, Modernized Testing System, Version 07/20/2026; Section 2 Driving Safely, physical 46, printed 2-28; 2.12 Driving in Fog. ↗

  30. A truck is fitted with radiator shutters and a winterfront. A driver proposes closing them as much as possible because the weather is very cold. What risk is being overlooked?

    Correct answer: Too little cooling airflow can still overheat the engine

    Even in winter, frozen-shut shutters or an excessively closed winterfront can restrict cooling enough to overheat the engine. Use the configuration appropriate to that vehicle and its manufacturer guidance.

    Source: Virginia Commercial Driver's License Manual, Modernized Testing System, Version 07/20/2026; Section 2 Driving Safely, physical 47, printed 2-29; 2.13.1 Vehicle Checks—Radiator Shutters and Winterfront. ↗

  31. A truck's tires were set correctly when cold. After highway travel in hot weather, the pressure is higher, and a coworker suggests releasing air to restore the cold reading. Why should the driver reject that suggestion?

    Correct answer: Releasing air while hot can leave the tires underinflated after cooling

    Tire pressure rises as tires warm. Do not bleed a normally warmed tire down to its cold specification; that can leave too little pressure when it cools. Follow the applicable cold-pressure specification.

    Source: Virginia Commercial Driver's License Manual, Modernized Testing System, Version 07/20/2026; Section 2 Driving Safely, physical 47, printed 2-29; 2.14.1 Vehicle Checks—Tires. ↗

  32. The coolant-temperature gauge on a conventional diesel truck rises above the manufacturer's highest safe temperature during travel. What is the appropriate response?

    Correct answer: Stop driving as soon as safely possible and have the cause investigated

    An above-safe coolant temperature can indicate a serious problem. Safely stop and investigate through the appropriate vehicle procedure or qualified assistance; this does not authorize opening a hot pressurized cooling system.

    Source: Virginia Commercial Driver's License Manual, Modernized Testing System, Version 07/20/2026; Section 2 Driving Safely, physical 48, printed 2-30; 2.14.1 Vehicle Checks—Engine Coolant. ↗

  33. A train has just cleared one of two parallel tracks at a crossing. What danger must the truck driver still check for before crossing when permitted?

    Correct answer: Another train may have been hidden on the other track

    A train on one track can conceal a second train. Continue to obey crossing controls and make sure all tracks are clear before proceeding.

    Source: Virginia Commercial Driver's License Manual, Modernized Testing System, Version 07/20/2026; Section 2 Driving Safely, physical 50, printed 2-32; 2.15.3 Driving Procedures—Double Tracks Require a Double Check. ↗

  34. A driver knows a long, steep downgrade is ahead in a conventional geared truck. What should be settled before the truck starts down?

    Correct answer: The appropriate safe speed and low gear for that vehicle and grade

    Choose the proper speed and gear before descending. A late downshift can fail or damage the transmission, and the suitable descent gear is vehicle-specific.

    Source: Virginia Commercial Driver's License Manual, Modernized Testing System, Version 07/20/2026; Section 2 Driving Safely, physical 51, printed 2-33; 2.16.2 Select the Right Gear before Starting Down the Grade. ↗

  35. A truck's ABS is working, but a known mechanical brake defect has not been corrected. Which statement best describes the protection ABS provides?

    Correct answer: ABS cannot make the defective service brakes mechanically sound

    ABS supplements the normal brakes; it does not repair defects or compensate for poor brake maintenance. A functioning ABS system is not evidence that the underlying brakes are sound.

    Source: Virginia Commercial Driver's License Manual, Modernized Testing System, Version 07/20/2026; Section 2 Driving Safely, physical 55, printed 2-37; 2.18.8 Safety Reminders. ↗

  36. A truck's yellow ABS malfunction lamp comes on during the trip, well after its normal startup check. What does that signal mean?

    Correct answer: ABS control may be lost even though the regular brakes still work

    A new ABS malfunction indication can mean loss of anti-lock control. Normal brake functions may remain, but the fault needs attention; follow the vehicle's warning instructions and have the system serviced.

    Source: Virginia Commercial Driver's License Manual, Modernized Testing System, Version 07/20/2026; Section 2 Driving Safely, physical 55, printed 2-37; 2.18.7 Braking If ABS Is Not Working. ↗

  37. A truck driver who was not involved in a crash has a safe place to stop and assist. Why should the truck be parked away from the immediate crash area?

    Correct answer: Emergency vehicles may need the space next to the crash

    If stopping to help, avoid occupying the space immediately around the crash. Responders need access, and the truck should not create another obstruction or hazard.

    Source: Virginia Commercial Driver's License Manual, Modernized Testing System, Version 07/20/2026; Section 2 Driving Safely, physical 56, printed 2-38; 2.20.1 Protect the Area. ↗

  38. An interstate CMV driver is moving in traffic. Dispatch asks for an ordinary scheduling call using a phone held in the driver's hand. No emergency is involved. Which statement applies?

    Correct answer: The carrier may not require or allow that hand-held call while driving

    Federal rules prohibit a motor carrier from requiring or allowing hand-held mobile-telephone use while driving a CMV. Routine business urgency is not the necessary emergency-services exception.

    Source: Virginia Commercial Driver's License Manual, Modernized Testing System, Version 07/20/2026; Section 2 Driving Safely, physical 40, printed 2-22; 2.9.4 Cell/Mobile Phones; current 49 CFR 392.82(a)(2). Current corroboration, read 2026-09-13: https://www.ecfr.gov/current/title-49/subtitle-B/chapter-III/subchapter-B/part-392/subpart-H/section-392.82 (full section, including the necessary emergency-services exception). ↗

  39. An interstate CMV is temporarily stopped at a red light with its engine running. The driver wants to type a routine text to dispatch. How does the federal texting rule treat this situation?

    Correct answer: The temporary traffic stop is still driving for the texting prohibition

    For the federal CMV texting rule, driving includes an engine-running vehicle temporarily stopped for traffic or a traffic-control device. A routine dispatch message does not qualify for the emergency-services exception.

    Source: Virginia Commercial Driver's License Manual, Modernized Testing System, Version 07/20/2026; Section 2 Driving Safely, physical 41, printed 2-23; 2.9.5 Texting; current 49 CFR 392.80(a),(c),(d). Current corroboration, read 2026-09-13: https://www.ecfr.gov/current/title-49/subtitle-B/chapter-III/subchapter-B/part-392/subpart-H/section-392.80 (full section; engine-running temporary stop and nonemergency text specified). ↗

  40. An interstate CMV driver is safely parked but is too fatigued to begin the next leg safely. Dispatch says the delivery deadline cannot move. No grave emergency exists. What must the driver do?

    Correct answer: Remain out of operation until able to drive safely

    A driver must not operate, and a carrier must not require or permit operation, when fatigue makes driving unsafe. A deadline, familiar route, or available driving hours does not override that duty.

    Source: Virginia Commercial Driver's License Manual, Modernized Testing System, Version 07/20/2026; Section 2 Driving Safely, physical 44, printed 2-26; 2.11.2 Driver Factors—Warning Signs of Fatigue (heading begins physical 43); current 49 CFR 392.3. Current controlling corroboration, read 2026-09-13: https://www.ecfr.gov/current/title-49/subtitle-B/chapter-III/subchapter-B/part-392/subpart-A/section-392.3 (full section; grave-emergency exception excluded by the scenario). ↗

  41. A truck's exhaust pipe is still firmly mounted, but a joint is leaking near the cab. Why does secure mounting alone not make this condition safe?

    Correct answer: Leaking exhaust can allow harmful fumes into the cab or sleeper

    A broken or leaking exhaust system can admit harmful fumes into the cab or sleeper. Firm mounts do not seal a leaking joint. This concern is separate from exhaust parts rubbing against fuel-system components.

    Source: Virginia Commercial Driver's License Manual, Modernized Testing System, Version 07/20/2026; Section 2 Driving Safely, physical 21, printed 2-3; 2.1.3 What to Look For—Exhaust System Defects. ↗

  42. A truck is safely parked after startup. Its engine oil pressure stays below the manufacturer's normal range and the low-pressure warning remains on. What should the driver do?

    Correct answer: Stop the engine and have the low-pressure condition investigated

    Operating oil pressure should reach the vehicle's normal range after startup. A persistent low-pressure warning calls for stopping the engine and investigating the fault, not continuing to run it. A satisfactory oil-quantity check does not establish adequate operating pressure.

    Source: Virginia Commercial Driver's License Manual, Modernized Testing System, Version 07/20/2026; Section 2 Driving Safely, physical 22, printed 2-4; 2.1.5 Seven-step Inspection Method—Step 3, Look at the Gauges; Figure 2.5 oil-pressure warning (generic PSI values not used). ↗

  43. In a clear loading yard, either of two approved approaches would let a driver back the same truck into a space. Why favor the approach that turns toward the driver's side?

    Correct answer: It gives the driver a better view of the rear through the side window

    Driver-side backing generally provides a better direct view of the rear of the vehicle. That visibility advantage does not eliminate blind spots, the need to use both mirrors, or the vehicle's normal turning geometry.

    Source: Virginia Commercial Driver's License Manual, Modernized Testing System, Version 07/20/2026; Section 2 Driving Safely, physical 27, printed 2-9; 2.2.4 Backing Safely—Back and Turn Toward the Driver's Side; Use Mirrors on Both Sides. ↗

  44. A driver and a yard helper have not worked together before. Before the truck begins backing, what should they establish about hand signals?

    Correct answer: That both understand the signals, including a clear stop signal

    Before backing with a helper, the driver and helper should agree on signals both understand, especially the signal to stop. Guessing at an unfamiliar gesture once the vehicle is moving leaves an avoidable communication gap.

    Source: Virginia Commercial Driver's License Manual, Modernized Testing System, Version 07/20/2026; Section 2 Driving Safely, physical 27, printed 2-9; 2.2.4 Backing Safely—Use a Helper. ↗

  45. On an unlit road, a truck's low beams reveal less roadway than the distance it would need to stop at its present speed. What adjustment is needed?

    Correct answer: Reduce speed so the truck can stop within the roadway the driver can see

    At night, speed must allow the truck to stop within the distance the driver can actually see ahead. A posted limit or distant lights do not supply enough visible stopping space. The principle does not depend on a universal headlight-range number.

    Source: Virginia Commercial Driver's License Manual, Modernized Testing System, Version 07/20/2026; Section 2 Driving Safely, physical 45, printed 2-27; 2.11.3 Roadway Factors—Poor Lighting; 2.11.4 Vehicle Factors—Headlights; corroborating qualitative principle at physical 33, printed 2-15, 2.6.4. ↗

  46. An approaching vehicle's headlights create glare on a dark two-way road. A right edge marking is visible. Where should the truck driver direct their view instead of staring into those headlights?

    Correct answer: Slightly to the right toward the available lane or edge marking

    The manual advises avoiding a direct stare into oncoming headlights and looking slightly right toward an available lane or edge marking. This is a visual-reference choice, not an instruction to turn onto the shoulder or stop watching the road.

    Source: Virginia Commercial Driver's License Manual, Modernized Testing System, Version 07/20/2026; Section 2 Driving Safely, physical 45, printed 2-27; 2.11.5 Night Driving Procedures—Avoid Glare from Oncoming Vehicles. ↗

  47. After unloading a box truck, a driver will leave a sheltered tunnel into strong side winds. What should the driver recognize about the lighter vehicle?

    Correct answer: Strong side winds can make the lighter truck harder to keep in its lane

    Strong winds can make lane control difficult, and the problem is usually worse for lighter vehicles. Leaving a tunnel can expose the truck abruptly to those winds. Being inside the sheltered section does not establish the conditions outside.

    Source: Virginia Commercial Driver's License Manual, Modernized Testing System, Version 07/20/2026; Section 2 Driving Safely, physical 36, printed 2-18; 2.7.3 Space to the Sides—Strong Winds. ↗

  48. A truck enters water or slush and begins hydroplaning. Why may its steering and brakes no longer respond normally even though the controls still work?

    Correct answer: Water or slush has separated the tires from the road, reducing traction

    During hydroplaning, the tires lose contact with the road and have little or no traction. Working controls cannot provide normal steering or braking without that tire-road grip. This identifies the mechanism; it is not a vehicle-specific recovery procedure.

    Source: Virginia Commercial Driver's License Manual, Modernized Testing System, Version 07/20/2026; Section 2 Driving Safely, physical 33, printed 2-15; 2.6.2 Matching Speed to the Road Surface—Hydroplaning. ↗

  49. After hearing a possible tire blowout, a driver has brought a truck with dual rear tires to a secure place where an outside inspection can be made safely. The truck did not fishtail. What should happen next?

    Correct answer: Check all the tires; one failed dual may not have caused obvious handling changes

    A failure of one tire in a dual set may not produce an obvious handling change. Once safely stopped in a suitable place, the driver should check all the tires rather than treat stable handling as proof that none failed.

    Source: Virginia Commercial Driver's License Manual, Modernized Testing System, Version 07/20/2026; Section 2 Driving Safely, physical 54, printed 2-36; 2.17.4 Tire Failure—Check the Tires; preceding Recognize Tire Failure, physical 53, printed 2-35. ↗

  50. A truck's brakes have failed on a long downgrade. A designated truck escape ramp is available ahead and its entrance is clear and reachable. Which choice fits that emergency?

    Correct answer: Use the available escape ramp rather than pass it hoping for a better option

    If brakes fail on a downgrade, an available escape ramp is a purpose-built escape option. Delaying while continuing downhill can add speed and make stopping harder. The scenario assumes the ramp is clear and reachable; it does not prescribe an equipment-specific brake-control sequence.

    Source: Virginia Commercial Driver's License Manual, Modernized Testing System, Version 07/20/2026; Section 2 Driving Safely, physical 53, printed 2-35; 2.17.3 Brake Failure—Brake Failure on Downgrades and escape-ramp continuation; adjacent ramp context at physical 51, printed 2-33, 2.16.4. ↗

  51. A truck's front tires have lost their grip in a turn. The front of the truck keeps sliding nearly straight even as the driver adds steering angle. What explains this behavior?

    Correct answer: The front tires cannot direct the truck normally while their traction is lost

    In a front-wheel skid, the front of the vehicle can continue in a straight line despite additional steering input. The problem is lost tire-road grip; turning the wheel farther does not by itself restore it. This is recognition of a front-wheel skid, not a complete recovery drill.

    Source: Virginia Commercial Driver's License Manual, Modernized Testing System, Version 07/20/2026; Section 2 Driving Safely, physical 56, printed 2-38; 2.19.3 Front-wheel Skids (Figure 2.19 below depicts a different, rear-tractor jackknife condition). ↗

  52. A driver is assigned a truck with working ABS and suggests reducing the usual safe following gap because the truck must now stop in less distance. Which response is sound?

    Correct answer: Keep adequate following space; ABS does not guarantee a shorter stopping distance

    ABS helps preserve control when wheels are about to lock, but it does not necessarily shorten the stopping distance. Working ABS is not a reason to follow more closely or reduce the space needed for the actual road, speed and traffic conditions.

    Source: Virginia Commercial Driver's License Manual, Modernized Testing System, Version 07/20/2026; Section 2 Driving Safely, physical 55, printed 2-37; 2.18.8 Safety Reminders—ABS won't allow closer following and won't necessarily shorten stopping distance; preceding ABS introduction at physical 54, printed 2-36. ↗

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CDL general-knowledge questions marathon

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