Transportation
CDL General KnowledgeCommercial Driver's License — General Knowledge
The CDL General Knowledge test is the foundational written exam every commercial driver's license applicant — Class A, B, and C — must pass to get a Commercial Learner's Permit. Built from the AAMVA/FMCSA model CDL manual and given by each state's DMV, it covers safe vehicle operation, inspection, space and hazard management, and cargo basics.
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Exam facts
Everything you need to know about the CDL General Knowledge exam.
- Passing score
- 80% (typically 40 of 50)
- Format & length
- ~50 multiple-choice questions (varies by state)
- Voucher cost
- Bundled into state CLP/CDL fees (~$10–$100; varies by state)
- Prerequisites
- Valid driver's license; 18+ intrastate / 21+ interstate; DOT medical certification
- Validity
- Passing earns the Commercial Learner's Permit (valid 180 days); 14-day hold before the skills test
Exam facts sourced from the official FMCSA (Commercial Driver License Program) certification page. Last reviewed June 2026.
What’s tested
Key topics on the CDL General Knowledge exam.
The Cert Climb question bank is mapped to every domain on the official CDL General Knowledge exam blueprint, so what you study is what the test asks.
- Vehicle Inspection
- Basic Control & Shifting
- Seeing, Space & Hazard Management
- Driver Behavior & Fitness
- Adverse Conditions
- Emergencies & Braking (ABS)
- Hazmat Awareness
- Cargo, Weight & Balance
Who it’s for
Built for the people taking this exam.
Aspiring commercial truck and bus drivers, and career-changers entering trucking, transit, delivery, or construction driving.
Why it matters in 2026
The career signal.
It is the required gateway for every CDL class and endorsement — you cannot start behind-the-wheel training without it. With ~3.8M active CDL holders and ~400,000 new CDLs a year plus high turnover, it is the front door to a high-demand trade.
Sample question
What a CDL General Knowledge question looks like.
What is the main reason a commercial driver performs a pre-trip inspection before every trip?
See the answer & explanation
Correct: B. To find problems that could cause a crash or breakdown before driving
Why: The purpose of the pre-trip inspection is safety: catching mechanical problems before they cause a crash or a breakdown on the road.
What you get
Everything you need to actually pass.
Full question bank
70 questions covering every objective on the official CDL General Knowledge exam blueprint, with detailed explanations on every option — right and wrong.
Quiz modes
Timed exam simulation, missed-only review, topic drills, and a daily question of the day. Practice the way you study best.
Flashcards
Spaced-repetition flashcards generated from each topic. Pull them up on a phone in the gap between meetings.
Progress tracking
See per-topic accuracy and answered counts. Find weak areas before they cost you on test day.
Per-category premium
Unlocking CDL General Knowledge unlocks every other Transportation exam in the Cert Climb catalog — pay once, stack credentials.
No-fluff explanations
Every wrong answer comes with a 2-3 sentence explanation of why it’s wrong, not just “the correct answer is X.” Pattern recognition is the whole game.
Read while you study
CDL General Knowledge articles & study guides
CDL General Knowledge Study Guide 2026: Pass the Written Test
The CDL General Knowledge test is the one written exam every commercial driver — Class A, B, and C — has to pass to get a permit. Here's what's on it, the highest-yield rules to memorize, and a 1-2 week plan to pass at 80%.
How to Pass the CDL General Knowledge Test in 2026 (80% to Pass)
The fastest route to passing the CDL General Knowledge test: focus on inspection and space/hazard management, drill practice questions, clear the 80% bar, and get your permit. Here's the plan.
FAQ
Frequently asked questions about CDL General Knowledge
What is the CDL General Knowledge exam?
The CDL General Knowledge test is the foundational written exam every commercial driver's license applicant — Class A, B, and C — must pass to get a Commercial Learner's Permit. Built from the AAMVA/FMCSA model CDL manual and given by each state's DMV, it covers safe vehicle operation, inspection, space and hazard management, and cargo basics.
How many questions are on the CDL General Knowledge exam, and how long is it?
~50 multiple-choice questions (varies by state)
What is the passing score for the CDL General Knowledge exam?
80% (typically 40 of 50)
How much does the CDL General Knowledge exam cost?
Bundled into state CLP/CDL fees (~$10–$100; varies by state)
Are there prerequisites for the CDL General Knowledge exam?
Valid driver's license; 18+ intrastate / 21+ interstate; DOT medical certification
How long is the CDL General Knowledge certification valid?
Passing earns the Commercial Learner's Permit (valid 180 days); 14-day hold before the skills test
How many questions does the CDL General Knowledge bank have?
70 questions, organized into 8 subject areas mapped to the official exam objectives.
Is the free trial really free?
Yes. 30 questions, no credit card, no email-trap, no “activate by Friday or pay” spam. You either upgrade because the bank’s good, or you don’t.
What does premium cost?
Premium is sold per category and unlocks every Transportation exam in the Cert Climb catalog. Plans are 1-month, 3-month, or 12-month — see the upgrade modal for current pricing.
How current is the CDL General Knowledge content?
We track exam version updates and refresh the bank within weeks of new objectives. Where the version of an exam matters (e.g. CompTIA SY0-701 vs. SY0-601), question explanations call it out.
Can I cancel my subscription anytime?
Yes. Cancellation is one click from your profile. Your access continues through the end of the period you’ve already paid for.
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