What is it?

What exactly is the CDL General Knowledge Test?

CDL General Knowledge Test — Transportation, Aviation & Maritime credential from State Driver Licensing Agencies (AAMVA model curriculum)

Core written test taken by every commercial driver applicant, covering vehicle inspection, safe operating procedures, cargo and hours of service. Offered by State Driver Licensing Agencies (AAMVA model curriculum), it is designed for candidates who need to demonstrate verified competence in the Transportation, Aviation & Maritime field. The credential is commonly used for career entry, advancement, regulatory compliance, or employer requirements. Candidates should review the official handbook for eligibility, exam format, and scoring before registering.

The path in brief

1. Confirm you meet any eligibility or prerequisites
2. Review the official handbook and study materials
3. Register and pay through the awarding body or authorized provider
4. Schedule and take the exam (test center or online proctoring)
5. Receive your score and, if passed, your credential

Before you book

Who is eligible to sit the CDL General Knowledge Test?

Eligibility varies; many credentials are open to all, while others require coursework, work experience, or sponsorship.

Who it is for: Professionals and candidates seeking to validate Transportation, Aviation & Maritime competence.

The test itself

What is the format of the CDL General Knowledge Test?

The CDL General Knowledge Test is administered by State Driver Licensing Agencies (AAMVA model curriculum) and runs ~45-60 minutes (state-set).

The fine print

What are the retake and renewal rules for the CDL General Knowledge Test?

Proctoring & delivery

Proctored, computer-based delivery (test center or remote online proctoring), varying by exam.

Retake policy

Varies by credential — most bodies permit retakes after a waiting period and full or partial fee.

Score reporting

Scores are reported per the body’s timeline, typically electronically after the exam.

Recertification

Varies; many credentials require renewal every 2–3 years via continuing education or a recertification exam.

What it pays

How much does this credential pay?

$57,440 median for heavy and tractor-trailer truck drivers (BLS, May 2024)

The General Knowledge Test is not itself a job credential — it is the first gate to a Commercial Learner’s Permit (CLP) and, after a skills test, to a Class A or Class B CDL — but the occupation it leads to is the single largest driving job in the country, so BLS data is the right way to size the payoff. The closest official occupation is Heavy and Tractor-trailer Truck Drivers (SOC 53-3032), because a Class A CDL is what that role requires; there is no BLS occupation called "CDL driver", and any salary page that quotes one is quoting a job-board aggregate rather than government data. That occupation had a May 2024 median of $57,440, with the lowest 10 percent under $38,640 and the highest 10 percent over $78,800. The spread matters for how you read this test: a General Knowledge pass alone does not put you at the median, because the median reflects experienced drivers with a clean record and, often, years of route seniority — but it does remove the licence barrier that stands between an entry applicant and the middle of the distribution. The employment base is enormous: 2,235,100 jobs in 2024, projected to grow about 4 percent to 2,324,400 by 2034, adding roughly 89,300 net jobs, with about 237,600 openings a year arising from both growth and replacement. That replacement figure is the durable argument for treating the CDL as a recession-resistant credential: freight does not stop moving when the economy softens. Note carefully that BLS does not isolate CDL class in its wage series, so these numbers describe the occupation, not the licence, and a bus or straight-truck (Class B) driver may sit below the Class A median; the School Bus Drivers series (SOC 53-3051) carries a lower median and is covered separately where relevant.

Job growth.+4% projected change 2024-34 (growth), ~237,600 openings a year; the General Knowledge Test is the universal gateway to this occupation regardless of trailer type or endorsement.

Source: BLS Occupational Outlook Handbook — Heavy and Tractor-trailer Truck Drivers

Your schedule

How long should I study for it?

15-30 hours of reading and timed practice of focused study

The General Knowledge Test draws on the first sections of your state’s CDL manual — almost always Section 1 (Driving Safely), Section 2 (Carrying Cargo Safely), and, if you intend to drive a bus, Section 3 (Transporting Passengers). The exact chapter order and the number of questions vary by state, but the federal knowledge areas are fixed in 49 CFR 383.111(a)(1) through (a)(20): they run from basic vehicle control and visual search, through speed and space management, hazard perception, emergency control of a stopped vehicle, skid control and recovery, railroad-highway grade crossings, and inspection, to cargo documentation and securement. The first planning decision is whether the General Knowledge Test is all you need. If you will drive a combination (Class A) or an air-braked vehicle, you must also pass the Combination Vehicles and/or Air Brakes knowledge tests, which are separate exams and are covered in their own depth files — but you typically sit them on the same CLP application, so build the study block to cover all three if your vehicle requires them. The plan below assumes a computer-delivered, multiple-choice exam of roughly 50 questions needing 40 correct (80 percent), and it assumes you have already cleared ELDT if you are a first-time applicant, because the DMV will refuse the test otherwise. Total elapsed time is short — this is a reading-and-recall exam, not a skills exam — but most failures come from reading the wrong manual or skipping the cargo and hazard sections, so the schedule weights those heavier than candidates expect.

1. Week 14-6 hrs

   Section 1 — Driving Safely, part 1

   • Download the CDL manual from the DMV/SDLA of the state that will issue your CLP — not a generic app — and read Section 1 through visual search and space management
   • Master the speed/space rule: below 40 mph leave one second per 10 feet of vehicle length; above 40 mph add one extra second (minimum 4 seconds total for a bus)
   • Work the speed-management material: total stopping distance = perception + reaction + braking distance, and why it grows with the square of speed
   • Take your state’s official practice test for Section 1 and record every miss by topic
2. Week 24-6 hrs

   Section 1 — Driving Safely, part 2 (hazards and emergencies)

   • Hazard perception and the "what if" scanning habit; distracted, drunk and drowsy driving rules and the federal hours-of-service backdrop
   • Skid control and recovery: identify which axle is skidding and how to correct a front- vs rear-wheel skid
   • Railroad-highway grade crossings, bridge and overpass clearance, and emergency control of a stopped vehicle (parking, stalled, fire)
   • Night, winter, rain, fog and mountain driving; managing the space around you in adverse conditions
3. Week 34-6 hrs

   Section 2 — Cargo, and Section 3 if applicable

   • Cargo weight distribution, axle limits and the driver’s responsibility for securement; inspect within 25 miles of starting, every 3 hours or 150 miles, and after every break
   • Documentation: the driver vehicle inspection report and what you must know before moving loaded cargo
   • If you will drive a bus, read Section 3: passenger loading, aisle and emergency-exit rules, and the 100-foot signalling rule for turns
   • Do not conflate this with the Air Brakes or Combination tests — those are separate and listed as such on your CLP
4. Week 44-6 hrs

   Full-length practice and gap closing

   • Three timed 50-question practice exams using your state’s question bank or an official-equivalent set
   • Re-read only the chapters where you missed questions; this exam rewards knowing the manual’s wording, not general road sense
   • Drill the cargo-inspection intervals and the space/speed rule until they are automatic
   • Confirm ELDT is logged in the Training Provider Registry before booking, and bring the CLP identity documents on test day

What to buy

Which study resources are worth paying for?

The buying decision here is mostly "free vs convenience." The authoritative source — your state’s CDL manual and its official practice tests — costs nothing, and for most candidates it is sufficient. Paid resources earn their place only as repetition engines or as structured courses for people who will not otherwise sit down with the PDF. Beware any product that quotes a "CDL pass rate," since that figure is not published by any government and is the vendor’s own practice-test metric.

Prices checked 2026-08 in USD before tax and vary by state and provider. State DMV manuals and practice tests are free and authoritative; commercial "pass rate" claims are vendor-internal and not official. We do not rank by commission.

What you'll face

What question types will I see?

The General Knowledge Test is multiple-choice and delivered by computer at a state DMV/SDLA; there is no practical or performance component at the knowledge stage — that comes later at the skills test. The federal baseline is an 80 percent pass under 49 CFR 383.135, with states setting the exact question count; a common configuration is 50 questions requiring 40 correct, but verify your state’s number because it is not federal. Under 49 CFR 383.133 the state must use FMCSA pre-approved (AAMVA 2005 CDL Test System) items, may offer the test in another language or orally, but may not use a translator. Items are single-best-answer by design, though some states include true/false or multiple-response variants; the worked samples below are editor-written illustrations of the published blueprint, not live exam items, and they track the actual knowledge areas in 49 CFR 383.111(a). The pacing implication is simple: because there is no curve, your only job is to push the correct count above the 80 percent line, so answer the quick items immediately and return to hard ones rather than stalling.

Samples are editor-written illustrations of the published blueprint (49 CFR 383.111 knowledge areas), not live exam items.

Reference

What are the key facts about the CDL General Knowledge Test?

CDL General Knowledge Test is a exam credential; awarded by State Driver Licensing Agencies (AAMVA model curriculum); the exam fee is State-set, commonly $10-$100 for the knowledge test; typical preparation is Varies.

In short

Is the CDL General Knowledge Test worth it?

• CDL General Knowledge Test is awarded by State Driver Licensing Agencies (AAMVA model curriculum).
• Validates job-ready competence in Transportation, Aviation & Maritime.
• Registration is through the awarding body or an authorized test provider.
• Renewal and retake policies vary — confirm before scheduling.

Worth comparing

How does the CDL General Knowledge Test compare with similar credentials?

• CDL Air Brakes Knowledge Test State Driver Licensing Agencies (AAMVA model curriculum)
• CDL Combination Vehicles Knowledge Test State Driver Licensing Agencies (AAMVA model curriculum)

Trust

Where does this information come from?

Everything above is taken from the awarding body's own published material. Fees, question counts and domain weights are revised regularly — check the official page before you pay.

Research confidence: low · Last reviewed 2026-08