Iowa CDL Manual
Read the official manual from IA DOT directly. Download the PDF for offline study or read it online.
Official Resource
This handbook is sourced directly from IA DOT.
Testing at a Glance for Iowa
Once you've read the handbook, here's what to expect at the IA DOT knowledge test.
35
80%
No time limit
Documents You'll Need When You Take the 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-Specific Rules Covered in This Handbook
Rules unique to Iowa that IA DOT weights heavily in the knowledge test — you'll see these in the handbook chapters.
- 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
After You Pass: Iowa License Renewal
8 years
$32
Up to 180 days before expiration
More Iowa Driving Resources
Iowa Handbook FAQ
Is this the official Iowa CDL handbook?
Yes. The handbook mirrored above is the same document IA DOT publishes on its official website — we host it here for faster mobile loading and cleaner reading.
Should I upgrade to a REAL ID version of my Iowa license?
Obtaining or upgrading to a REAL ID-marked card requires an in-person visit with identity, SSN, and two residency documents; cannot be done online.
Can I get a printed copy of the Iowa handbook?
Some IA DOT field offices distribute free printed copies while supplies last — availability varies by location. If none are stocked, you can print the PDF at any office-supply or public library.
Should I read the Iowa handbook as a PDF or HTML?
PDF preserves the state's page layout and images; HTML is faster on mobile and searchable via Ctrl-F. Most students find HTML best for study, PDF best for a final read-through before test day.
Can I read the Iowa handbook on my phone?
Yes. Both the official PDF and our mirrored HTML version work on mobile. HTML loads faster on cellular and is easier to search — use the reader above for study sessions on the go.
How current is this Iowa handbook version?
IA DOT updates the handbook when state law changes — usually once per year, sometimes more when major legislation passes. Our copy is refreshed against the state site as soon as a new edition drops.
Which CDL endorsements does this Iowa manual cover?
Typically all federally recognized endorsements: Hazmat (H), Tank (N), Doubles/Triples (T), Passenger (P), and School Bus (S). Each endorsement has its own chapter and its own separate written knowledge test.
Do I have to read the whole Iowa handbook to pass the test?
The IA DOT test has 35 questions and you need 28 correct (80%) to pass. All questions come from the handbook, but strategic readers focus on Signs, Right-of-Way, and Signaling first — those chapters carry the most test weight.