Green Light CDL → Iowa CDL Practice Test
🗺️ Iowa · All Endorsements · Lifetime Access

Pass Your Iowa CDL
Written Test on the First Try

Iowa is the heart of American agriculture, and its CDL market reflects that. The state produces more corn, hogs, and eggs than virtually any other — creating massive demand for grain hopper, livestock, and refrigerated hauling. I-80 runs east-west across the state connecting the coasts, while I-35 runs north-south connecting Texas to Minnesota, making Iowa a natural freight corridor. Wind energy is a booming sector, with Iowa generating more wind power per capita than almost any state — creating demand for heavy oversize-load haulers moving turbine blades and tower sections. Iowa Premium, Tyson, and JBS all operate major packing plants requiring steady inbound livestock hauling. Green Light CDL's 482 questions prepare you to pass on your first visit to the Iowa DOT Motor Vehicle Division.

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About the Test

About the Iowa CDL Knowledge Test

📋 Who Administers It

The Iowa CDL knowledge test is administered by the Iowa Department of Transportation (DOT) – Motor Vehicle Division. You must schedule and take your knowledge test at an authorized testing location before receiving your Commercial Learner's Permit (CLP).

📍 Testing Locations

CDL knowledge tests are available at driver licensing offices throughout Iowa, including locations in Des Moines, Cedar Rapids, Davenport, Sioux City, Iowa City and other cities. Check the Iowa DOT Motor Vehicle Division website for the nearest location.

📝 What to Bring

  • Valid government-issued ID or current driver's license
  • Proof of state residency (utility bill, lease, etc.)
  • Social Security card or SSN verification
  • Completed CLP application form
  • Application and testing fee (cash or card)
  • DOT medical examiner's certificate (if required at your stage)

🎓 CDL Classes Available

  • Class A — Combination vehicles (tractor-trailer, doubles, triples). Required for most over-the-road trucking jobs.
  • Class B — Single vehicles over 26,001 lbs (dump trucks, buses, straight trucks).
  • Class C — Vehicles carrying 16+ passengers or HazMat placards not covered by A or B.
📊
General Knowledge: 50 questions — need 40 correct (80%) to pass
Endorsement tests: 20–30 questions each, all requiring 80% to pass. You take only the sections for the endorsements you want.
Start Studying — $79
Test Breakdown

Iowa CDL Test Section Breakdown

All CDL knowledge tests follow AAMVA federal standards. Here's every section you might face — along with question counts and passing scores.

Test Section Questions Need to Pass Pass Rate Who Needs It
✅ General Knowledge 50 40 80% All CDL applicants — required
Air Brakes 25 20 80% Required to remove air brake restriction
Combination Vehicles 20 16 80% Class A CDL applicants
HazMat 30 24 80% H endorsement (requires TSA background check)
Tanker Vehicles 20 16 80% N endorsement
Doubles & Triples 20 16 80% T endorsement
Passenger Transport 20 16 80% P endorsement (buses, shuttles)
School Bus 20 16 80% S endorsement
Complete Coverage

How Green Light CDL Covers Every Section

Our 482-question bank isn't random trivia. Every question maps directly to an AAMVA CDL manual section so you learn exactly what the Iowa DOT Motor Vehicle Division tests.

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General Knowledge

Covers all 166 pages of the AAMVA manual — vehicle inspection, shifting, coupling, hazards, and more. The biggest section; our test bank gives it the most questions.

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Air Brakes

Dual air circuits, slack adjusters, brake fade, and the air brake check procedure — explained clearly so you can answer every question cold.

☢️

HazMat

Placarding rules, shipping papers, bulk/non-bulk packaging, emergency response, and routes — everything for the 30-question HazMat endorsement test.

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Combination Vehicles

Coupling/uncoupling, rearward amplification, rollover risk, and converter dollies — the foundation of the Class A test.

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Tanker & Doubles/Triples

Surge, baffles, high center of gravity, and the unique coupling procedures for triples — covered in full detail for the N and T endorsement tests.

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Personal Study Bank

Every question you miss gets saved. You drill your weak spots until your Study Bank is empty. That's when you're ready to walk in and pass.

Iowa Requirements

Iowa CDL Requirements

Before you can take the knowledge test, you need to meet these Iowa CDL eligibility requirements set by the Iowa DOT Motor Vehicle Division and federal regulations.

🎂 Age Requirements

  • 18 years old — intrastate CDL (within Iowa only)
  • 21 years old — interstate CDL (cross state lines)
  • 21 years old — any HazMat endorsement, regardless of route type

🩺 DOT Medical Certificate

All CDL applicants must pass a DOT physical exam performed by a licensed medical examiner listed on the FMCSA National Registry. You must maintain a valid medical certificate throughout your CDL career. Common disqualifiers include uncontrolled diabetes, vision below 20/40 corrected, or certain cardiovascular conditions.

📚 ELDT — Entry-Level Driver Training

Since February 7, 2022, all first-time CDL applicants must complete ELDT (Entry-Level Driver Training) from an FMCSA-registered training provider before taking their CDL skills test. ELDT covers theory and behind-the-wheel training. The knowledge test (what Green Light CDL prepares you for) is separate from ELDT.

🏠 Residency & Licensing

  • Must be a legal Iowa resident with a valid Iowa driver's license
  • You can only hold a CDL from one state at a time
  • Must provide proof of Iowa domicile (address)
  • Existing non-CDL license must be surrendered upon CDL issuance
Pricing

One Price. No Subscriptions. No Games.

Everything you need to pass your Iowa CDL written test — for one flat price.

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Complete Practice Test Access

Was $149
$79
  • 482 practice questions from the official AAMVA manual
  • Personal Study Bank — drill your weak spots
  • Section filters & shuffle mode
  • All 50 states including Iowa
  • All endorsement sections covered
  • Instant feedback on every answer
  • Works on any device — phone, tablet, laptop
  • Lifetime access — pay once, use forever
  • First-Try Pass Guarantee
Get Instant Access — $79

Instant digital access. No shipping. Cancel-free — it's a one-time purchase.

🛡️

First-Try Pass Guarantee

Complete the full test bank and fail your Iowa CDL written exam — we'll refund you in full. No questions asked.

FAQ

Iowa CDL — Common Questions

Yes — every question was pulled directly from the official 166-page AAMVA CDL manual, which is the same manual Iowa uses for its knowledge test at the Iowa DOT Motor Vehicle Division. No filler, no made-up questions — just the real content you'll be tested on.
Yes. The CDL knowledge test is based on the federal AAMVA manual, which is consistent across all 50 states including Iowa. One purchase covers every state and every endorsement — forever.
The Iowa General Knowledge test has 50 questions and requires 40 correct (80%) to pass. Endorsement tests (Air Brakes, HazMat, Tanker, etc.) have 20–30 questions each, all requiring 80% to pass. Green Light CDL's 482-question bank covers every section.
Every question you get wrong gets saved to your Personal Study Bank permanently. You retake those specific questions until you nail them. Remove them when you feel confident. When your Study Bank is empty — you're ready to walk into the Iowa DOT Motor Vehicle Division and pass.
No. The CDL knowledge test (written test) is 100% self-study. CDL schools charge $5,000–$10,000 to teach the skills test portion, but Green Light CDL gives you everything you need for the written test for $79. You can study on your phone, tablet, or laptop — no classroom required.
All of them — General Knowledge, Air Brakes, HazMat, Combination Vehicles, Doubles & Triples, Tanker Vehicles, Passenger Transport, and School Bus. Whether you're going for a Class A, B, or C CDL in Iowa, everything is included.
Class A covers combination vehicles over 26,001 lbs where the towed unit exceeds 10,000 lbs — this is your tractor-trailer license. Class B covers single vehicles over 26,001 lbs (dump trucks, buses, straight trucks). Class C covers vehicles carrying 16+ passengers or HazMat placards not otherwise covered by A or B.
ELDT (Entry-Level Driver Training) has been required since February 2022 for all first-time CDL applicants. It covers both theory instruction and behind-the-wheel training from an FMCSA-registered provider. The CDL knowledge test (what Green Light CDL prepares you for) is taken before your ELDT is complete — at the CLP stage. ELDT is required before you take your final CDL skills test.
Lifetime. Pay once, use it forever. Come back when you need a refresher, when you're adding an endorsement, or if you need to retest. No subscription, no expiration.
Simple: complete the full 482-question test bank and fail your Iowa CDL written exam — we'll refund you in full, no questions asked. We've built the bank from the official manual; if you master it and still fail, we want to make it right.

Ready to Pass Your Iowa
CDL Written Exam?

482 questions. Personal Study Bank. First-Try Guarantee. $79 — yours forever.

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Instant access · Lifetime license · Works on any device