CDL General Knowledge practice test

Real numbers

What the rules say

Sources: FMCSA (49 CFR 383, official CDL manual) + O*NET OnLine / U.S. BLS OEWS — verified 2026-09-21. State-specific numbers per the state DMV's published guidance.

The General Knowledge test is the written gatekeeper for every CDL class, so it pays to be systematic. Work through the handbook topics in order — vehicle inspection, basic control, cargo, and emergencies — before you time yourself on practice sets. The two-part exam structure (knowledge then skills) means a solid written pass also leaves you free to focus training time on the three skills-test parts.

General Knowledge is the one test every CDL applicant takes, regardless of class. Its 20 topic areas come from 49 CFR 383.111(a) and cover the daily realities of commercial driving: vehicle inspection, basic control, shifting, cargo, emergencies and the rules of the road.

A common mistake is to treat General Knowledge as a memorisation exercise. In practice the questions are scenario-based — they ask what you would do in a skid, on a downgrade or with a tire blowout. Answering scenario questions well requires understanding why the rule exists, not just recalling it.

Because the same federal areas are tested in every state, a solid federal-level foundation transfers anywhere. Once you are scoring well on the core set here, the only state-specific work left is learning your state's question count, passing score and any local additions to the handbook.

Use this page together with the Class A, Class B and endorsement pages: General Knowledge gives you the base, and the endorsement tests layer the specialist rules on top. Practice the base until it is automatic before adding specialist material.

A useful self-check: after each practice set, write down the topics you missed. If the same area — say, cargo securement or emergency braking — keeps appearing on your miss list, go back to the handbook section for that topic before your next set. This targeted loop beats re-reading the whole manual.

When you review a missed question, ask yourself whether the error was a knowledge gap or a reading error. If you knew the rule but misread the question, slow down and read the stem twice — scenario questions often hide a key word like 'except' or 'when' that changes the answer entirely.

Here is how the General Knowledge test fits into the bigger picture. The written exam you will sit at the DMV is built from the federal list of knowledge areas, and General Knowledge is the largest single block of them. It is also the gatekeeper: until you pass it, you cannot hold a commercial learner's permit, and without the permit you cannot take the driving lessons or the skills test that lead to the full CDL. For that reason, studying General Knowledge first — before endorsements, before the skills curriculum — is the standard order used by most training schools. The topics themselves are practical: how to inspect a vehicle before a trip, how to control it on grades and curves, how to handle cargo so it stays put, and how to respond when something goes wrong, from a skid to a blowout to a brake failure. None of it is abstract theory; every question traces back to a real driving situation you will face. Because the same federal areas are tested in every state, the work you do here transfers everywhere, and the only state-specific part is the question count and passing score. Practice until the scenarios feel familiar, and the real test stops being an unknown and becomes a formality.

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