Free Iowa CDL Practice Tests — Your Complete Study Guide
Pass your Iowa CDL permit exam with 80%+ on the first try
What You Need to Study
General Knowledge
The foundation of your CDL exam. Covers traffic laws, safe driving techniques, vehicle inspection procedures, cargo handling, and federal regulations every commercial driver must understand.
Combination Vehicles
Essential for driving tractor-trailers. Covers coupling and uncoupling procedures, rollover prevention, inspecting combination vehicles, and safely maneuvering with attached trailers.
Air Brakes
Required for any vehicle equipped with air brakes. Covers how air brake systems work, dual air brake systems, inspecting air brakes, and using them safely in all conditions.
Endorsement Tests
HazMat
Required for transporting hazardous materials. Covers placarding, labeling, loading procedures, emergency response, and compliance with federal hazmat regulations.
Tanker
Required for driving tank vehicles used to transport liquids or gases in bulk. Covers safe loading, unloading, and driving techniques specific to tanker operations.
Doubles & Triples
Required for pulling double or triple trailers. Covers coupling and uncoupling multiple trailers, safe driving practices, and inspection procedures for multi-trailer rigs.
Passenger
Required for operating vehicles designed to transport 16 or more passengers. Covers passenger safety, loading, emergency exits, and pre-trip inspection requirements.
What Are You Preparing For?
Select one or more options so we can show you exactly which tests you need to take.
What You Need to Study
General Knowledge
16 sections · 800 questions
The foundation of your CDL exam. Covers traffic laws, safe driving techniques, vehicle inspection procedures, cargo handling, and federal regulations every commercial driver must understand.
Combination Vehicles
9 sections · 180 questions
Essential for driving tractor-trailers. Covers coupling and uncoupling procedures, rollover prevention, inspecting combination vehicles, and safely maneuvering with attached trailers.
Air Brakes
6 sections · 150 questions
Required for any vehicle equipped with air brakes. Covers how air brake systems work, dual air brake systems, inspecting air brakes, and using them safely in all conditions.
Endorsement Tests
Additional endorsements you may need depending on the type of vehicle or cargo you plan to operate.
HazMat
9 sections · 202 questions
Required for transporting hazardous materials. Covers placarding, labeling, loading procedures, emergency response, and compliance with federal hazmat regulations.
Tanker
6 sections · 133 questions
Required for driving tank vehicles used to transport liquids or gases in bulk. Covers safe loading, unloading, and driving techniques specific to tanker operations.
Doubles & Triples
7 sections · 144 questions
Required for pulling double or triple trailers. Covers coupling and uncoupling multiple trailers, safe driving practices, and inspection procedures for multi-trailer rigs.
Passenger
6 sections · 123 questions
Required for operating vehicles designed to transport 16 or more passengers. Covers passenger safety, loading, emergency exits, and pre-trip inspection requirements.
Your Path to a Commercial Driver's License
To get a CDL, you must first study for and pass the permit exam at the DMV. After you receive your permit, you can take commercial vehicle driving classes and complete the required training. The final step is passing the official driving exam to earn your CDL. Our practice tests help you prepare for the DMV permit exam with real-style questions, and we also provide extra study materials and helpful resources to guide you through the process.
To obtain a CDL in Iowa, you must pass three written permit tests — General Knowledge, Combination Vehicles, and Air Brakes — at the Iowa Department of Motor Vehicles. Similar to a regular driver's license permit exam, these are timed, multiple-choice tests based on the official Iowa CDL handbook.
All of our practice material is built from the official Iowa CDL handbook and federal resources, and curated by professionals with over 10 years of experience in the commercial transportation industry. Studying with practice tests that mirror the real exam format is one of the most effective ways to pass on your first try.
On this page you'll find free practice tests for all three sections. For the full question bank and additional study features, download the CDL Help app.
CDL Requirements in Iowa
- To obtain a Commercial Driver License (CDL) in Iowa, you must meet the following eligibility requirements:
- Must be at least 18 years old for intrastate (within Iowa) commercial driving.
- Must be at least 21 years old for interstate commercial driving or to transport hazardous materials.
- Must hold a valid Iowa driver's license.
- Must be a U.S. citizen or lawful permanent resident.
- Must be an Iowa resident.
- Must complete a medical examination and provide a valid Medical Examination Report (MCSA-5875) and Medical Examiner's Certificate (MCSA-5876). Medical exams must be renewed every two years.
- Must pass the General Knowledge written test and any applicable endorsement knowledge tests.
- Must obtain a Commercial Learner's Permit (CLP) before taking the CDL skills test; the CLP must be held for at least 14 days.
- Must pass a three-part skills test: pre-trip vehicle inspection, basic vehicle control, and on-road driving.
- Entry Level Driver Training (ELDT) is required for all original Class A and Class B CDL applicants, as well as those adding Passenger (P), School Bus (S), or Hazmat (H) endorsements.
- Must not have a "prohibited" status in the federal Drug & Alcohol Clearinghouse (DACH).
- Must pass a TSA security threat assessment for Hazmat endorsement.
- CDL classes: Class A (combination vehicles over 26,001 lbs GCWR), Class B (single vehicles over 26,001 lbs GVWR), Class C (vehicles designed to transport 16+ passengers or hazmat).
- Endorsements available: H (Hazmat), N (Tank), P (Passenger), S (School Bus), T (Double/Triple Trailers), X (Hazmat + Tank).
- Iowa CDL fees: $8 per year of validity.
- Iowa CDLs are valid for up to 5 years (or 2 years if under 21).
Official Iowa CDL Handbook
The official Iowa Commercial Driver's License Manual covers every topic tested on the state's CDL knowledge exam — but it reads like a dense reference manual, not a structured study guide. A more effective way to prepare is with our General Knowledge practice tests. Our free Iowa CDL permit practice test mirrors the format and content of the official exam and is fully up to date as of February 2026. Each practice test features 20 questions covering essential topics such as vehicle inspection, safe driving techniques, air brakes, cargo securement, driving emergencies, hazardous conditions, and Iowa-specific commercial driving regulations. Unlike the official test, every practice question comes with a helpful hint and a detailed explanation of the correct answer — so you actually learn from every question you answer.
- Complete CDL regulations and Iowa-specific requirements
- Safe driving techniques, vehicle inspection, and cargo handling
- All endorsement categories and testing requirements
Non-Domiciled CDL Information
Important information about non-domiciled commercial driver's licenses in Iowa.
Federal regulations on non-domiciled CDLs are changing rapidly. The information below reflects the latest known state actions.
Iowa DOT explicitly confirms its non-domiciled CDL program. Individuals who are not U.S. citizens, lawful permanent residents, or citizens of Canada/Mexico may present an unexpired Employment Authorization Document (EAD) or an unexpired foreign passport with an I-94 form for issuance of a non-domiciled CDL. Citizens of Mexico or Canada (except DACA-recipient Mexican citizens) cannot obtain or renew a non-domiciled CDL per 49 CFR 383.71 and 383.23. Under the FMCSA final rule published on February 13, 2026 (effective March 16, 2026), eligibility for non-domiciled CLPs and CDLs is further restricted to H-2A, H-2B, and E-2 visa holders, and EADs will no longer be accepted. Note: The September 2025 interim final rule was stayed by the D.C. Circuit Court of Appeals (November 10-13, 2025). The February 2026 final rule has been challenged in federal court but no stay has been granted on it as of this writing. Affected drivers should contact the Iowa DOT for the most current information.[FMCSA Final Rule]
English Language Proficiency (ELP)
Federal ELP enforcement applies to all CDL holders nationwide.
Federal ELP enforcement applies to all CDL holders nationwide. Here is how it is enforced in Iowa.
Iowa does not currently administer a separate state-level English Language Proficiency (ELP) test for CDL applicants. However, all Iowa CDL holders are subject to federal ELP enforcement, which took effect on June 25, 2025. Under this enforcement, roadside inspectors conduct a two-step assessment: first, a conversational interview in English — no interpreters or translation tools are permitted — to evaluate whether the driver can communicate sufficiently in English; second, the driver must demonstrate the ability to read and interpret standard U.S. traffic signs. Drivers who fail either step of the assessment are placed out of service under CVSA guidelines. Iowa CDL applicants should be prepared to demonstrate English proficiency during any roadside inspection or compliance review.