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Free Oklahoma CDL practice test online

Take a free Oklahoma CDL practice exam online with clear explanations—no sign-up. Coverage includes general knowledge, vehicle systems, combination vehicles, cargo, and endorsements. Then verify current requirements with Service Oklahoma.

CDL knowledge tests are federally regulated, so the passing score in Oklahoma is the same as everywhere else: 80% correct on every knowledge test. You must also hold a commercial learner’s permit for 14 days before the skills test.

Start practice Exam-style run

New to the knowledge test? CDL endorsements explained · One-week study plan

Practice coverage
Complete a run to establish your baseline.
600questions
23topics
80%federal pass mark

49 CFR 383.135(a)(1) sets the CDL knowledge-test passing score at 80%. Reaching it here is not a prediction of your official result.

Requirements before you test

Oklahoma CDL test requirements

80%
Passing score
49 CFR 383.135(a)(1)
14 days
CLP held before skills test
Service Oklahoma
18
Min. age (in-state)
Service Oklahoma
21
Min. age (interstate)
49 CFR 391.11(b)(1)

Commercial licensing is largely federal. Any figure above credited to a 49 CFR section applies in every state — see 49 CFR 383.135(a)(1) and 49 CFR 383.25(e). A figure credited to Service Oklahoma is Oklahoma’s own, and may be stricter than the federal floor. Test length, fees, and scheduling are set by Service Oklahoma (official source).

Entry-Level Driver Training comes first

Since February 7, 2022, a new Class A or Class B CDL, a class upgrade, or a first passenger, school bus, or hazardous materials endorsement requires training from a provider on the FMCSA Training Provider Registry (49 CFR 380.600). Practice questions are study material and do not satisfy that requirement.

FMCSA Training Provider Registry

You need a Oklahoma licence first

A commercial learner’s permit only counts if you already hold an ordinary licence from the same state (49 CFR 383.25(a)(2)). The Oklahoma non-commercial knowledge test runs 20 questions and needs 15 correct, with permits issued from age 15.

Oklahoma permit practice test
Quick practice
10 balanced questions with feedback after every answer.
Practice now
Topic review
Focus on one knowledge area before returning to mixed practice.
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Exam-style run
Answer the full starter bank before seeing your results.
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What you will practice

Build coverage topic by topic.

Each question carries a topic, difficulty, explanation, and source section so your review has context.

General knowledge29 reviewed questionsMountain driving12 reviewed questionsAir brakes61 reviewed questionsCombination vehicles54 reviewed questionsVehicle systems9 reviewed questionsCargo18 reviewed questionsTank vehicles47 reviewed questionsDoubles and triples43 reviewed questionsHazardous materials71 reviewed questionsSchool bus48 reviewed questionsPassenger vehicles45 reviewed questionsSafe driving6 reviewed questionsSpace management14 reviewed questionsVehicle inspection15 reviewed questionsEmergencies23 reviewed questionsHours of service14 reviewed questionsBasic control11 reviewed questionsSeeing hazards15 reviewed questionsWeather18 reviewed questionsNight driving7 reviewed questionsDriver fitness8 reviewed questionsSpeed management17 reviewed questionsCommunication15 reviewed questions

Sample questions

5 Oklahoma CDL practice questions

Try these Oklahoma sample questions now — each shows the correct answer with a plain-language explanation and a source section. The full 600-question bank is in the practice run.

  1. 1. Blocking is used in front, back, or sides of cargo to:

    • Keep cargo from sliding by fitting snugly and securing to the deck
    • BReplace all tiedowns permanently
    • CCover cargo from rain only
    • DRaise the center of gravity

    Answer: Keep cargo from sliding by fitting snugly and securing to the deck. Bracing from the upper cargo to the floor or walls also limits movement in transit.

    Source: Commercial Driver License Manual — Securing cargo — blocking and bracing

  2. 2. ABS is best described as:

    • AA replacement for normal brakes that always shortens stops
    • An addition that helps prevent wheel lock during hard braking without replacing normal brake capability
    • CA system that only works under 20 mph
    • DA substitute for following distance

    Answer: An addition that helps prevent wheel lock during hard braking without replacing normal brake capability. ABS activates when lockup is about to occur. You may not stop shorter, but you should keep steering control.

    Source: Commercial Driver License Manual — Antilock braking systems — how ABS helps

  3. 3. A student who was crossing disappears from your view. You should:

    • Secure the bus, take the key, and go look for the student
    • BWait 30 seconds and then proceed
    • CAsk students aboard to look out the windows
    • DSound the horn and pull away slowly

    Answer: Secure the bus, take the key, and go look for the student. Never move while a child is unaccounted for. Setting the brake and taking the key makes it impossible for the bus to roll while you search.

    Source: Commercial Driver License Manual — School buses — student loading

  4. 4. Drivers say liquid shifting is a problem with anything other than:

    • ABaffled only
    • BHalf full
    • Full or empty
    • DPressurized only

    Answer: Full or empty. Partial loads need the most careful speed, braking, and direction control—especially on ramps.

    Source: Commercial Driver License Manual — Tank vehicles — partial loads

  5. 5. A full tank of a dense liquid (such as some acids) may:

    • ARequire no outage
    • BEliminate surge entirely
    • CAlways be legal at any volume
    • Exceed legal weight limits, so you may only partially fill

    Answer: Exceed legal weight limits, so you may only partially fill. How much to load depends on expansion (outage), liquid weight, and legal weight limits.

    Source: Commercial Driver License Manual — Tank vehicles — how much to load

Practice all 600 questions

CDL knowledge areas

Classes and endorsements, organized.

Each area below scopes the reviewed question bank to one knowledge test. The material is federal, so it applies in Oklahoma just like everywhere else — the endorsement guide explains how the codes fit together.

General knowledge

The foundation for commercial driving: inspections, space, speed, communication, hazards, and safe operation.

  • Pre-trip inspection
  • Space and speed management
  • Railroad crossings
  • Emergency procedures
Practice general knowledge
Air brakes

Understand air-brake components, inspections, warning devices, stopping distance, and controlled braking.

  • Dual air systems
  • Low-air warnings
  • Brake lag and fade
  • Applied-leak and static checks
Practice air brakes
Combination vehicles

Prepare for safe coupling, inspection, turning, backing, and handling of tractor-trailer combinations.

  • Fifth-wheel inspection
  • Coupling and uncoupling
  • Off-tracking
  • Trailer skid prevention
Practice combination vehicles
Hazardous materialsEndorsement H

Study hazard communication, shipping papers, placards, loading rules, parking, and emergency response responsibilities.

  • Hazard classes
  • Placards and labels
  • Shipping papers
  • Loading and segregation
Practice hazardous materials
Tank vehiclesEndorsement N

Learn how liquid surge, outage, bulkheads, and high centers of gravity change vehicle handling.

  • Liquid surge
  • Outage requirements
  • Smooth braking
  • Rollover prevention
Practice tank vehicles
Doubles & triplesEndorsement T

Practice converter-dolly inspection, coupling order, rearward amplification, and stability principles.

  • Coupling sequence
  • Converter dollies
  • Rearward amplification
  • Space management
Practice doubles & triples
Passenger vehiclesEndorsement P

Prepare to inspect, load, and operate buses while keeping passengers, aisles, and exits safe.

  • Vehicle inspection
  • Passenger loading
  • Emergency exits
  • Prohibited practices
Practice passenger vehicles
School busEndorsement S

Review student loading, danger zones, mirrors, emergency procedures, and special railroad-crossing duties.

  • Danger zones
  • Student loading
  • Mirror use
  • Railroad crossings
Practice school bus
Official source hub
Verify current rules before your test.

QuizLane’s starter material points learners back to the agency responsible for licensing in Oklahoma. Rules and manuals can change; the official agency remains authoritative.

Visit Service Oklahoma
Our accuracy promise
Original wording—not scraped competitor questions
A source section attached to every reviewed item
A correction path when something looks wrong
Read our methodology

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Common questions

What this practice can—and cannot—tell you.