Regulation-backed learning

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A question bank is only as current as the rule it was written from, and most never tell you which rule that was. CertQuestUSA cites the regulation behind every one of its questions, and explains why each wrong answer is wrong, so you can check what you are learning against the rule itself.

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✓ Real regulations cited✓ Audio on every question✓ Timed exam simulator✓ Updated Sep 2026

CDL General Knowledge · Question 4/10

Diagnostic

Under the federal tire tread depth standard, what is the minimum tread depth allowed in any major tread groove on a steering axle tire?

A. 1/32 inch

B. 4/32 inchCorrect

C. 2/32 inch

D. 6/32 inch

Why: Front-wheel tires on a bus, truck or truck tractor need at least 4/32 inch in a major tread groove under 49 CFR 393.75(b). The 2/32 minimum in subsection (c) applies to other tires; 1/32 is below either minimum, and 6/32 is not the required minimum.

775

practice exams

83,709+

questions, each citing its rule

regulated-work verticals

state/DC jurisdictions

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Studying for a securities license? See the securities exams: SIE, Series 7, 63, 65, 66 and SAFE MLO, with fees and passing scores.

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The CertQuestUSA difference

Free practice sites guess. Course bundles charge $200–$500 and still don’t cite their sources. We show you the exact rule behind every answer.

Every answer cites its regulation

49 CFR, 29 CFR, 40 CFR, state statutes, the exact section, quoted, so you can verify us. Nobody else does this at scale.

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Audio narration on every question

Commute mode, gym mode, hands-free review. Every question and answer read aloud, with variable speed.

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Timed exam simulator

Full-length papers under real time pressure, with the same domain weighting as the real exam.

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Missed-question retest

Every wrong answer queues for spaced retesting until it’s locked in, not just "reviewed once."

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AI study assistant

Ask why an answer is right, in plain English, grounded in the cited rule, not generic chatbot fluff.

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How it works

Step 1

Take a free practice test

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Step 2

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Your breakdown becomes a guided plan: cited questions, audio review, and retests on what you miss.

Step 3

Pass under real conditions

Full timed papers with real domain weighting, walk into the testing center having already done this.

Every question is traceable to its source

49 CFR · CDL & FMCSA29 CFR · OSHA Standards40 CFR · EPA14 CFR · FAAState Licensing StatutesFINRA & NASAA Rules

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349,745+

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$6,485

average initial OSHA penalty

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of citations at sites under 100 employees

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569+

real exams mapped to real BLS occupation data

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Why test-takers switch to CertQuestUSA

The three complaints we hear most, and how we answer them.

Free question banks rarely say which rule they were written from.

Our questions are written to the actual regulation and cite the exact rule, so what you study is what you sit.

Studying everything evenly is how people run out of time.

The free diagnostic shows your weakest domains before you pay a cent, then builds your plan around them.

Most people preparing for these exams are already working full time.

Audio on every question, offline mode, commute-friendly sessions. Study in the gaps your day already has.

These are the objections we hear most often, not customer reviews. Real reviews are collected after every pass and will appear here as they come in.

Frequently asked questions

Is the diagnostic really free?

Yes -- on almost every exam you can take one full-length practice test free, built to the real exam’s domain weights, with every answer explained and a weak-spot breakdown at the end. No sign-up and no card. You only pay if you want more papers, the timed simulator, or drills on what you missed.

Where do the questions come from?

Every question is written directly from the real regulation -- 49 CFR for CDL and FMCSA, 29 CFR for OSHA, 40 CFR for EPA, 14 CFR for FAA, real state licensing statutes for insurance and real estate, and FINRA/NASAA rules for securities -- with the exact section cited so you can verify it yourself.

Can I buy just one exam instead of subscribing?

Yes -- a 30-day pass for one exam is $14.99 with no renewal, or $39.99 gets lifetime access to a single exam: full papers, audio, the timed simulator, missed-question retests, and the AI study assistant, no recurring charge. Or $19.99/month covers every exam in every vertical.

What if I fail the real exam?

Every plan carries a 7-day money-back guarantee, no conditions. And on a subscription plan, if you score 90%+ on two full practice papers and still don’t pass the real exam, email us and we’ll extend your access free until you do. One-time exam purchases already keep their access for good, so the pass promise does not apply to them.

Is my state or endorsement covered?

51 states are covered today, each verified against its own real statute where the license depends on state law -- plus every real CDL endorsement, and 775 exams total across 8 regulated-work verticals.

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Ten real questions, your weakest domains, a plan to fix them. No sign-up, no card, two minutes.

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Sitting it again costsmore than studying twice.

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Popular practice tests

Study the whole path, not just one test

The CertQuestUSA difference

How it works

Pay for one exam, or own them all

Rated 5 / 5 by 1 verified buyer

Why test-takers switch to CertQuestUSA

Frequently asked questions

Find out where you stand, free.

Sitting it again costs
more than studying twice.