Free 2026 IA DMV Practice Tests
Based on the official Iowa Driver's Handbook. Get ready for your IA DOT written exam with our comprehensive practice tests.
IA CDL General Knowledge
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Commercial Driver's License (CDL)
What to Expect on the Iowa CDL Test
Computer at Iowa DOT driver's license service center or county treasurer's office.
No time limit
Schedule an appointment at an Iowa DOT driver's license service center or county treasurer's office; an at-home online option exists for applicants under 18.
Unlimited, one attempt per calendar day.
1-day wait between attempts.
English, Spanish
Documents to Bring to Your Iowa Test
Primary proof of identity, proof of Iowa residency, and proof of Social Security number at the driver's license service center or county treasurer's office.
Iowa Rules You'll See on the Test
Rules unique to Iowa that appear on the IA DOT knowledge test more than others.
- gavel Move Over or Slow Down law applies to all vehicles with flashing hazard lights
- gavel Slow-moving vehicle emblem rules for farm equipment
- gavel Moped operator licensing and equipment rules
- gavel GDL restrictions for drivers under 18 including nighttime driving limits
- gavel Rural gravel road right-of-way and yielding rules
Iowa DMV Test FAQ
How many questions are on the Iowa CDL permit test?
The IA DOT CDL knowledge test has 35 multiple-choice questions drawn from the official state handbook — covering road signs, traffic laws, right-of-way, and safe-driving procedures.
Do I need an appointment for the Iowa knowledge test?
Schedule an appointment at an Iowa DOT driver's license service center or county treasurer's office; an at-home online option exists for applicants under 18.
What's a Iowa-specific rule that shows up on the test?
One example: Move Over or Slow Down law applies to all vehicles with flashing hazard lights Rules like this are drawn straight from the state handbook and are the ones out-of-state applicants most often miss.
Should I go with my first instinct on the Iowa test?
Usually yes. Research on multiple-choice exams shows changing an answer helps only when you realize you misread the question — not when you simply feel uncertain. Read carefully once, commit, move on.
What's a passing score on the Iowa DMV knowledge test?
You need 28 out of 35 correct — 80% — to pass. The result is displayed immediately after you submit.
Can I take the Iowa DMV test in a language other than English?
Yes. IA DOT offers the knowledge test in 2 languages including English, Spanish. Ask when scheduling if your language is available at your chosen office.
What passing score does Iowa require on the CDL test?
Federal FMCSA regulations set the passing score at 80% on the General Knowledge test and every endorsement test. IA DOT follows this federal baseline for all CDL applicants — states cannot lower it.
How many practice tests can I take on this site?
Unlimited. There's no login, no daily cap, and no payment gate. Take one, review your mistakes, take another. Free practice tests are how we help — we make our money from ads, not from the tests.
If I fail, can I retake the Iowa test the same day?
Typically no — most states enforce a waiting period between attempts. See the retake FAQ item above (if we have specific data for your state) or ask the office when they schedule your retake.
Should I read the whole Iowa handbook before taking practice tests?
Not necessarily. Most successful test-takers skim the handbook once, then drill practice tests. When they miss a question they jump back to that chapter. This is far more efficient than a cover-to-cover read.