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COMMERCIAL DRIVING · US GENERAL KNOWLEDGE

Free CDL practice test.
Build safer driving knowledge.

Try eight original CDL general-knowledge questions below. Create a free account for more AI-generated multiple-choice practice, explanations, and basic progress tracking.

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✓ No account needed for the 8 samples✓ Answers explained✓ State manual guidance
Practice previewCheck the risk before taking the road.
VEHICLE INSPECTIONLearning example
A pre-trip inspection reveals a damaged steering part that makes the truck unsafe. What should happen before departure?
✓Get the unsafe defect corrected
Understand the reason.

Correct the unsafe defect before operating the truck.

Practice. Understand. Review.

Published by PrepForCerts · Editorial responsibility and sources · Updated

Original AI-assisted learning samples prepared by PrepForCerts and checked against the linked sources. These are not actual issuer exam items or a claim of clinical or practical competence.

Start with eight CDL general knowledge questions

This free CDL practice test focuses on general knowledge: inspections, backing, road hazards, cargo, fatigue, following space, and route planning. Choose one answer for each situation and review the explanation before you move on.

Use this sample as a study starting point. It does not reproduce a state test or establish a passing score. Air-brake, combination-vehicle, passenger, school-bus, tanker, and hazardous-material knowledge require separate preparation when they apply to your license and vehicle.

States issue CDLs and set their testing procedures. General-knowledge practice cannot replace entry-level driver training, supervised vehicle practice, or a skills test. Use the manual and requirements for the state where you will apply.

Try 8 free CDL practice questions

Choose an answer, then check it. Explanations also open without JavaScript. These original samples support learning; their results do not predict your exam score.

QUESTION 1 OF 8 · VEHICLE INSPECTION

A pre-trip inspection reveals a damaged steering part that makes the truck unsafe. What should happen before departure?

Show answer and explanation

Answer: B. Correct the unsafe defect before operating the truck. Reduced speed or a plan to inspect later does not make an unsafe steering system acceptable. An inspection has value only when the defects it identifies lead to appropriate action.

Source: Oregon CDL manual §2.1.5: final safety check

QUESTION 2 OF 8 · BACKING SAFELY

Before backing, you cannot confirm the space behind the truck. What is the best next action?

Show answer and explanation

Answer: D. Check the path and clearance when they are uncertain. Mirrors can leave areas unseen; a horn does not confirm that the space is clear. Use the backing procedures and support appropriate to the site.

Source: Oregon CDL manual §2.2.4: backing path

QUESTION 3 OF 8 · RAILROAD CROSSINGS

Traffic beyond a railroad crossing leaves too little space for your entire truck. What should you do?

Show answer and explanation

Answer: C. Do not enter a crossing without enough room for the entire vehicle on the far side. A truck stopped partly on the tracks remains in danger even when the cab has crossed. Judge the available space before committing to the crossing.

Source: Oregon CDL manual §2.15.5: clearance beyond tracks

QUESTION 4 OF 8 · CARGO RESPONSIBILITY

A warehouse crew loads an accessible, unsealed cargo area. Who remains responsible for the driver’s required load-safety checks?

Show answer and explanation

Answer: A. Having someone else load the vehicle does not remove the driver’s required cargo-safety responsibilities. Check the load and securement as required. Sealed or inaccessible loads have additional inspection considerations; follow the applicable rules.

Source: Oregon CDL manual §3.1: cargo inspection

QUESTION 5 OF 8 · LOAD POSITION

Heavy cargo is stacked above lighter items, raising the load’s center of gravity. What is the main handling concern?

Show answer and explanation

Answer: B. A higher center of gravity increases rollover risk. Consider load position together with weight distribution, securement, curves, and steering maneuvers. A load can be within a weight limit and still create a handling hazard.

Source: Oregon CDL manual §3.2.3: center of gravity

QUESTION 6 OF 8 · FATIGUE

During an ordinary delivery, fatigue makes you unable to drive safely. What should you do?

Show answer and explanation

Answer: D. Do not operate when fatigue makes driving unsafe. Fresh air or a delivery deadline does not remove that duty. Plan a safe place to stop and obtain rest rather than trying to compensate for fatigue while driving.

Source: FMCSA Safety Planner §6.3.1: illness or fatigue

QUESTION 7 OF 8 · FOLLOWING SPACE

Rain reduces visibility and makes the road slippery. What should happen to your following gap?

Show answer and explanation

Answer: C. More space provides time to respond when visibility and traction worsen. Adjust speed and following space to the conditions. A fixed gap that was suitable in dry conditions may no longer provide enough margin.

Source: FMCSA: following-distance guidance

QUESTION 8 OF 8 · TRUCK ROUTE PLANNING

A car navigation app suggests a route for your commercial truck. What must you check before relying on it?

Show answer and explanation

Answer: A. A car route may omit restrictions relevant to a commercial vehicle. Check the route against the truck’s dimensions, weight, and applicable restrictions. The shortest or fastest car route is not automatically suitable for the truck.

Source: FMCSA: truck and bus route-planning tips

Keep practicing for your CDL general-knowledge test.

Add your state, CDL class, and general-knowledge test to your account. Continue with AI-generated multiple-choice quizzes, review explanations, and track your study alongside your state manual.

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Account practice is separate from these public samples. It is not an approved ELDT course or a practical skills evaluation.

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Connect each practice answer to your CDL manual

Oregon’s live manual provides the labeled general-knowledge examples used here. Your own state manual is the full study reference. Do not assume that every state has the same test length, wording, or administration rules.

QUESTIONS 1 & 2

Inspection and vehicle control

Review the purpose of inspections, action on unsafe defects, observation limits, and safe backing. Then practice vehicle-control skills with the required supervision.

QUESTIONS 3, 7 & 8

Space, hazards, and routes

Study crossing clearance, following space, changing road conditions, and truck-specific restrictions. Explain the risk before choosing a response.

QUESTIONS 4 & 5

Cargo safety

Review securement, distribution, inspection responsibilities, and center of gravity. Match requirements to the load and vehicle; this is not a hazmat endorsement lesson.

QUESTION 6

Driver readiness

Know how fatigue and illness affect safe operation. Include rest planning and the applicable hours-of-service material in your full study plan.

Add the other general-knowledge subjects in your state manual, such as braking fundamentals, emergencies, fires, and communication. These examples are not a complete chapter checklist.

CDL knowledge, training, and skills have different roles

Start with your state licensing agency. Confirm the class, vehicle type, restrictions, and endorsements you need before selecting study materials or booking a test.

Knowledge-test planning

General knowledge
Core commercial-driving concepts
Additional tests
Depend on class, vehicle, and endorsements
Test count and time
Check your state’s current requirements

Oregon’s manual lists general knowledge for all applicants. Its separate chapters show why one general sample cannot cover every test.

Read Oregon’s test overview

Practical preparation

CLP
Supervised practice with a qualified CDL holder
Skills evaluation
Inspection, basic controls, and road driving
ELDT
Required for covered applications and endorsements

FMCSA describes a 14-day CLP holding period before skills testing and applicable training requirements. Confirm your specific route and exceptions.

Read FMCSA’s CDL steps

Put your study plan into practice.

Add your CDL general-knowledge test to a free account for AI-generated multiple-choice practice and basic progress tracking.

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Build a CDL study routine around the vehicle you will drive

  1. Identify the licensing route

    Record your state, license class, planned vehicle, and endorsements. Download the current state manual and mark the chapters required for your tests.

  2. Read one manual topic before checking a sample

    Use the sample to test whether you can apply the rule. For a missed answer, return to the exact manual section rather than memorizing a letter.

  3. Separate knowledge errors from practical skills

    A wrong cargo or hazard answer identifies something to study. It does not measure backing, inspection performance, or on-road control. Arrange practical preparation through the required training and supervised practice.

  4. Confirm the requirements before booking

    Check state documents, medical and eligibility rules, test procedures, CLP timing, and any ELDT requirements. Do not use another state’s sample question count as your appointment plan.

Three practice mistakes to avoid

Start your practice for your CDL general-knowledge test with a free account.

Enter your state, CDL class, and knowledge-test scope when you set up practice. For example, use the format below and replace the state with your own. Review AI-generated multiple-choice questions beside your state manual.

Example exam name: CDL Class A — [your state] — general knowledge

Account practice is separate from these original samples. It is not an approved ELDT course, a skills evaluation, or a substitute for practical instruction.

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View plans and question limits

CDL practice FAQs

Is this CDL practice test free?

Yes. The eight questions and explanations can be used without an account. Separate account features and limits are listed on the pricing page.

Does this page cover my state’s exact test?

It covers general concepts with labeled Oregon manual references and federal guidance. Use your own state’s current manual for full coverage, fees, test rules, and administration details.

How many questions are on the CDL general knowledge test?

Check your state licensing agency. This page intentionally does not present one question count or time limit as a nationwide rule.

Does it include air-brakes or hazmat preparation?

No. These eight examples focus on general knowledge. Study the separate required chapters and tests for your vehicle and endorsements.

Can this satisfy ELDT or replace the skills test?

No. Covered applicants need the required training from a provider on FMCSA’s registry and the applicable licensing tests. Written practice does not demonstrate driving skills.

Official sources and content review

The linked references support exam facts and learning principles. They do not indicate that the exam provider approved our questions. Samples are original review drafts, not copied live exam items.

Oregon’s online chapters were checked October 11, 2026; no edition date was displayed. Federal training and truck-safety pages were also checked. The linked following-distance page is older, so the sample uses its general safety principle rather than dated statistics. Qualified driving-safety review is pending. Follow applicable laws, training, employer procedures, and your state manual.