CDL General Knowledge Practice Test 2026: Test d’entraînement 6

1. Question 1 sur 25

   What does a round, black-on-yellow warning sign mean?

   • AA school is ahead
   • BA sharp curve is ahead
   • CSlow-moving vehicles are ahead
   • DA railroad crossing is ahead
   Voir la réponse

   Réponse: D. A railroad crossing is ahead

   The round yellow advance sign warns that a railroad crossing is ahead: slow down, look and listen.

2. Question 2 sur 25

   Your low trailer gets stuck on a raised railroad crossing. What should you do first?

   • AStay in the cab and honk
   • BGet out and away from the tracks, then call 911
   • CTry to rock the truck loose
   • DWalk down the track to look for a train
   Voir la réponse

   Réponse: B. Get out and away from the tracks, then call 911

   Get out and move away from the tracks. Call 911 and give the crossing's location and DOT number if posted.

3. Question 3 sur 25

   To avoid a crash with an obstacle ahead, which is usually faster?

   • AStopping
   • BSounding the horn
   • CSteering around it
   • DSpeeding up
   Voir la réponse

   Réponse: C. Steering around it

   You can almost always turn to miss an obstacle more quickly than you can stop.

4. Question 4 sur 25

   When you steer quickly to avoid a crash, what should you avoid?

   • AKeeping both hands on the wheel
   • BTurning only as much as needed
   • CCountersteering once you pass the hazard
   • DBraking while you turn
   Voir la réponse

   Réponse: D. Braking while you turn

   Do not brake while turning; it can lock the wheels and cause a skid.

5. Question 5 sur 25

   A driver coming toward you drifts into your lane. Which way should you move?

   • ATo your right
   • BTo your left
   • CSpeed up
   • DStay in your lane and brake hard
   Voir la réponse

   Réponse: A. To your right

   When an oncoming driver drifts into your lane, a move to your right is best.

6. Question 6 sur 25

   What is controlled braking?

   • ABraking with the clutch pushed in
   • BPumping the brakes as fast as possible
   • CUsing only the parking brake to stop
   • DBraking hard without locking the wheels
   Voir la réponse

   Réponse: D. Braking hard without locking the wheels

   In controlled braking you brake hard but not so hard that the wheels lock. Keep steering moves small.

7. Question 7 sur 25

   How do you do stab braking?

   • APump the brake pedal as fast as you can the whole time
   • BPull the parking brake on and off again and again
   • CBrake lightly and hold the pedal down until you stop
   • DBrake fully, release when wheels lock, reapply when they roll
   Voir la réponse

   Réponse: D. Brake fully, release when wheels lock, reapply when they roll

   In stab braking, apply the brakes fully, release when the wheels lock, and reapply as soon as they roll again.

8. Question 8 sur 25

   What does an antilock braking system (ABS) do?

   • AIt always makes you stop in a shorter distance
   • BIt stops wheel lockup so you can keep steering
   • CIt replaces the normal brakes when they fail
   • DIt lets you drive faster safely on slick roads
   Voir la réponse

   Réponse: B. It stops wheel lockup so you can keep steering

   ABS keeps the wheels from locking so you can steer. It does not always shorten stopping distance.

9. Question 9 sur 25

   The ABS warning lamp stays on while you drive. What does this mean?

   • AABS may not work, but normal brakes still do
   • BThe parking brake has been left on
   • CYour air pressure is much too high
   • DYou have no working brakes at all
   Voir la réponse

   Réponse: A. ABS may not work, but normal brakes still do

   If ABS fails you still have regular brakes. Drive normally and have the system checked soon.

10. Question 10 sur 25

    Who is responsible for the cargo you haul if someone else loaded it?

    • AOnly the shipper
    • BYou, the driver
    • CNo one, once the trailer is sealed
    • DOnly the loader
    Voir la réponse

    Réponse: B. You, the driver

    The driver is responsible for inspecting cargo and knowing it is safe, even if someone else loaded it.

11. Question 11 sur 25

    When must you first check your cargo and its securement after starting a trip?

    • AWithin the first 50 miles
    • BWithin the first 500 miles
    • COnly at the end of the trip
    • DWithin the first 150 miles
    Voir la réponse

    Réponse: A. Within the first 50 miles

    Check the cargo and securing devices within the first 50 miles and adjust them as needed.

12. Question 12 sur 25

    After the first check, how often must you re-check cargo securement?

    • AOnce a day, at the start of each shift
    • BEvery 3 hours or 150 miles, whichever comes first
    • COnly when a new driver takes over
    • DEvery 500 miles, or at each fuel stop
    Voir la réponse

    Réponse: B. Every 3 hours or 150 miles, whichever comes first

    Re-check cargo when your duty status changes, after 3 hours or 150 miles, whichever comes first.

13. Question 13 sur 25

    What is the gross vehicle weight rating (GVWR)?

    • AThe weight carried by a single axle of the truck
    • BThe weight of the empty truck with no fuel or cargo
    • CThe weight limit posted by each city for its streets
    • DThe maker's maximum weight for a vehicle and its load
    Voir la réponse

    Réponse: D. The maker's maximum weight for a vehicle and its load

    GVWR is the manufacturer's maximum for the vehicle plus its load.

14. Question 14 sur 25

    What is gross combination weight (GCW)?

    • AThe weight of the tractor alone, without its fuel
    • BThe weight of the trailer only, without any cargo
    • CThe weight of the cargo only, without any trailer
    • DThe total weight of the power unit, trailers and cargo
    Voir la réponse

    Réponse: D. The total weight of the power unit, trailers and cargo

    GCW is the total weight of the tractor or truck, its trailers, and the cargo.

15. Question 15 sur 25

    What does a bridge formula do?

    • ASets the height limit for bridges
    • BSets the speed limit on bridges
    • CAllows less weight on axles that are closer together
    • DAllows more weight on axles that are closer together
    Voir la réponse

    Réponse: C. Allows less weight on axles that are closer together

    Bridge formulas limit the weight on axles that are close together to protect bridges and roads.

16. Question 16 sur 25

    How should you load cargo to avoid a high center of gravity?

    • ALow, with heavy items under light ones
    • BAll the weight at the very back
    • CHigh, so it is easy to unload
    • DHeaviest items on top of the load
    Voir la réponse

    Réponse: A. Low, with heavy items under light ones

    Keep the load low and put heavy items under lighter ones to lower the center of gravity.

17. Question 17 sur 25

    What can happen if there is too little weight on the drive axles?

    • ABetter fuel use and a smoother ride
    • BPoor traction, so the drive wheels spin
    • COverheated brakes on long downgrades
    • DHard steering and a sore steering axle
    Voir la réponse

    Réponse: B. Poor traction, so the drive wheels spin

    Too little weight on the drive axles gives poor traction, especially in bad weather.

18. Question 18 sur 25

    What is the minimum number of tiedowns for cargo on a flatbed?

    • AOne per 10 feet of cargo, and at least two
    • BOne for any load, no matter how long
    • CFour for any load, no matter how short
    • DOne per 20 feet of cargo, at least one
    Voir la réponse

    Réponse: A. One per 10 feet of cargo, and at least two

    Use at least one tiedown for each 10 feet of cargo. Any cargo, no matter how small, needs at least two.

19. Question 19 sur 25

    Under federal rules, how strong must a cargo securement system be?

    • AIts working load limit must be one-tenth of the cargo's weight
    • BIts working load limit must equal twice the truck's weight
    • CAny strap that fits is strong enough for any load
    • DIts working load limit must be at least half the cargo's weight
    Voir la réponse

    Réponse: D. Its working load limit must be at least half the cargo's weight

    The aggregate working load limit of the securement system must be at least one-half the weight of the cargo.

20. Question 20 sur 25

    What does a header board (headache rack) do?

    • AHolds the license plate and lights
    • BStops the trailer from swaying
    • CProtects you from cargo sliding forward
    • DKeeps rain from reaching the cargo
    Voir la réponse

    Réponse: C. Protects you from cargo sliding forward

    The front-end structure protects the driver from the load moving forward.

21. Question 21 sur 25

    You are hauling a sealed load you cannot inspect. What must you still check?

    • AThat gross and axle weight limits are not exceeded
    • BThat the seal is the right color for the load
    • CNothing; the shipper is responsible for all of it
    • DThe value of the cargo, for insurance reasons
    Voir la réponse

    Réponse: A. That gross and axle weight limits are not exceeded

    You cannot inspect sealed loads, but you must still make sure you are within weight limits.

22. Question 22 sur 25

    Why does hanging meat need special care?

    • AIt is unstable and has a high center of gravity
    • BIt must always ride on an open flatbed
    • CIt must be kept below freezing by the driver
    • DIt is too light to need any tiedowns at all
    Voir la réponse

    Réponse: A. It is unstable and has a high center of gravity

    Hanging meat can swing and shift, making the vehicle less stable, especially on ramps and curves.

23. Question 23 sur 25

    When hauling less than a full load of livestock, what helps keep the animals from shifting?

    • AFalse bulkheads
    • BDriving faster
    • COpening the side doors
    • DTiedowns on each animal
    Voir la réponse

    Réponse: A. False bulkheads

    False bulkheads keep livestock bunched together so they do not shift the center of gravity.

24. Question 24 sur 25

    What do oversized loads usually need?

    • ANothing special if they are driven at night
    • BSpecial permits, and sometimes escort vehicles
    • COnly a Class C license and no permits
    • DOnly an extra set of mirrors on the cab
    Voir la réponse

    Réponse: B. Special permits, and sometimes escort vehicles

    Over-length, over-width or overweight loads need special permits and are often limited to certain times.

25. Question 25 sur 25

    Your load needs hazmat placards. What do you need on your CDL?

    • ANo endorsement
    • BA passenger (P) endorsement
    • CA hazmat (H) endorsement
    • DA tank (N) endorsement
    Voir la réponse

    Réponse: C. A hazmat (H) endorsement

    Any driver who hauls hazardous materials that need placards must have a hazmat endorsement.

Clavier : 1–4 pour répondre, Entrée pour la question suivante.

L’examen réel : Varies by state; usually 50 questions, with 40 correct needed (80%)