Oklahoma (OK) CDL manual 2026

Practice the manual, chapter by chapter

State manuals are built on the same national model, chapter for chapter. One thing to know from each chapter, then real questions from it to answer — tap an option to check yourself.

1. 1

   Introduction

   Everyone

   You must notify your employer within 30 days of conviction for any traffic violations, except parking, no matter what type of vehicle you were driving.

   What penalty may a court impose for holding more than one license?

   1. AA fine of up to $1,000 and no jail time
   2. BA disqualification of exactly 30 days
   3. CA fine of up to $10,000 and no jail time
   4. DA fine of up to $5,000 or a jail term

   How quickly must you tell your employer that your license has been suspended?

   1. AWithin two business days
   2. BBefore your next dispatch
   3. CWithin seven days
   4. DWithin 30 days
   This chapter has 26 more questions. Practice them in the app and see your pass chance.
2. 2

   Driving Safely

   Everyone

   On rainy days, pedestrians may not see you because of hats or umbrellas; they may be hurrying to get out of the rain and may not pay attention to the traffic.

   When does the manual tell you to be especially alert for drunk and sleepy drivers?

   1. ALate at night
   2. BOn weekend afternoons
   3. CIn the hour after sunset
   4. DDuring the morning commute

   What should you do about an aggressive driver's gestures?

   1. ARecord them for the incident report
   2. BAcknowledge them so the driver calms down
   3. CReturn them once, to establish a boundary
   4. DIgnore them and refuse to react
   This chapter has 290 more questions. Practice them in the app and see your pass chance.
3. 3

   Transporting Cargo Safely

   Everyone

   Too much weight on the steering axle can cause hard steering and can damage the steering axle and tires.

   What does Gross Vehicle Weight Rating describe?

   1. AThe combined weight of a power unit and its trailer
   2. BThe weight transmitted to the ground by one axle
   3. CThe actual weight of the vehicle as loaded today
   4. DThe manufacturer's loaded weight for a single vehicle

   On a flatbed, what additional risk comes with a high center of gravity?

   1. AThe deck will flex and crack over time
   2. BThe trailer will ride nose-high when loaded
   3. CThe load may shift to the side or fall off
   4. DThe tie-downs will loosen as the trip continues
   This chapter has 26 more questions. Practice them in the app and see your pass chance.
4. 4

   Transporting Passengers

   P endorsement (bus)

   To get the passenger endorsement you must pass a knowledge test on Sections 2 and 4 of the manual.

   What does the manual say about the seat belt at the driver's position?

   1. AIt is required only when passengers are aboard
   2. BThe seat should have one, and you should always use it
   3. CIt is optional if the seat has an air suspension
   4. DIt is required only on interstate charter runs

   During your pre-trip inspection of a bus interior, which of these items must be in safe working condition before you drive?

   1. AOnboard entertainment screens and charging ports
   2. BHandholds, railings, and rider signaling devices
   3. CPassenger reading lamps and window shades
   4. DAir conditioning vents at every seat row
   This chapter has 98 more questions. Practice them in the app and see your pass chance.
5. 5

   Air Brakes

   Any vehicle with air brakes

   Controlled braking is braking as hard as possible without locking the wheels, with only small steering inputs.

   Your air compressor is belt-driven. What should you check about the belt during the pre-trip inspection?

   1. AThat the belt is in good condition and properly tight
   2. BThat the belt slips slightly to protect the compressor
   3. CThat the belt is loose enough to remove by hand
   4. DThat the belt has been coated with belt dressing

   You climb into an air-braked truck and cannot find an application pressure gauge. What does that mean?

   1. AThe vehicle uses wedge brakes instead of s-cam brakes
   2. BThe vehicle has a single rather than dual air system
   3. CThe gauge is not fitted to all vehicles
   4. DThe gauge has been removed and must be replaced
   This chapter has 148 more questions. Practice them in the app and see your pass chance.
6. 6

   Combination Vehicles

   Class A

   After raising the landing gear, the crank handle must be secured safely in its holder.

   Why is a fully loaded tractor-trailer more likely to roll over in a curve than a passenger car?

   1. AIts longer wheelbase makes the steering less responsive
   2. BIts brakes take longer to build application pressure
   3. CIts tires are wider and grip the pavement harder
   4. DIts cargo raises the center of gravity far above the road

   After the fifth wheel jaws lock during coupling, how do you confirm the connection with a tug test?

   1. APull forward gently in low gear with the trailer brakes locked
   2. BBack up firmly once more to reseat the kingpin
   3. CShake the release handle while a helper watches the jaws
   4. DRock the trailer sideways using the steering axle
   This chapter has 118 more questions. Practice them in the app and see your pass chance.
7. 7

   Doubles and Triples

   T endorsement

   Drivers of long combinations must look far ahead so maneuvers can be gradual.

   A converter dolly has no spring brakes. How do you release its brakes so it can be moved into position?

   1. AOpen the petcock on the dolly air tank
   2. BPull the release arm on the dolly's fifth wheel
   3. CPush in the trailer air supply knob on the tractor dash
   4. DCrank the dolly landing gear to its fully raised stop

   When hooking air lines between the first trailer and the converter dolly, how do you avoid crossing them?

   1. ATrace both lines back to the tractor before each trip segment
   2. BConnect only the emergency line, since the service line is optional
   3. CConnect whichever glad hand physically reaches its mate first
   4. DMatch service to service and emergency to emergency by color code
   This chapter has 98 more questions. Practice them in the app and see your pass chance.
8. 8

   Tank Vehicles

   N endorsement

   Tank vehicles come in many types and sizes; check the vehicle's operator manual to make sure you know how to inspect your tank vehicle.

   Inside cargo tanks, what is the key structural difference between a bulkhead and a baffle?

   1. AA bulkhead is removable for cleaning, while a baffle is welded in place
   2. BA bulkhead is solid and seals off compartments; a baffle has holes that let liquid pass
   3. CA bulkhead runs lengthwise along the tank, while a baffle runs across it
   4. DA bulkhead strengthens the tank shell, while a baffle only supports the piping

   What does the manual say wet roads do to normal stopping distance?

   1. AIncrease it by about one third
   2. BIncrease it by about half
   3. CDouble it
   4. DTriple it
   This chapter has 62 more questions. Practice them in the app and see your pass chance.
9. 9

   Hazardous Materials

   H endorsement

   Radioactive materials are assigned to hazard Class 7.

   What does the manual require for materials subject to spontaneous combustion or heating?

   1. AVehicles with sufficient ventilation
   2. BTransport only during daylight hours
   3. CA dedicated fire watch in the cargo area
   4. DRefrigerated transport at all times

   On a portable tank holding less than 1,000 gallons, how tall must the shipping name letters be?

   1. AAt least one inch
   2. BAt least three inches
   3. CAt least two inches
   4. DThere is no minimum for tanks that small
   This chapter has 234 more questions. Practice them in the app and see your pass chance.
10. 10

    School Buses

    S endorsement

    Position the convex mirrors to see the entire side of the bus up to the mirror mounts, the front of the rear tires touching the ground, and at least one traffic lane on either side of the bus.

    What does a sign mounted below the cross-buck tell you?

    1. AThe speed limit for crossing the tracks
    2. BThe number of tracks at the crossing
    3. CThe name of the railroad operating the line
    4. DThe distance to the next crossing

    When should you adjust the outside mirror system on your school bus?

    1. AWhile driving slowly during the first mile of the route
    2. BBefore starting the route, while the bus is safely parked
    3. COnly after a student reports something you failed to see
    4. DAt the first student stop, while the red lights are flashing
    This chapter has 98 more questions. Practice them in the app and see your pass chance.
11. 11

    Pre-Trip Vehicle Inspection

    Everyone (skills test)

    Low tread depth increases the effect of hydroplaning, reduces traction and increases stopping distance.

    What color must the reflectors mounted on the rear of a trailer be during your inspection?

    1. ABlue reflectors
    2. BRed reflectors
    3. CWhite reflectors
    4. DAmber reflectors

    What is the consequence of performing the hydraulic brake check incorrectly on the inspection test?

    1. AA point deduction from the total score
    2. BA warning noted on the score sheet
    3. CAn automatic failure of the test
    4. DA required retest of that item only
    This chapter has 200 more questions. Practice them in the app and see your pass chance.

The official Oklahoma CDL manual