Iowa CDL Practice Test 2026
The Iowa CDL knowledge test covers 50 questions on commercial vehicle operation, safety regulations, and pre-trip inspections. A 80% score is required to pass. Start with a free CDL practice test to gauge your readiness.
Last verified May 2026 · Iowa Commercial Driver's License Manual
How we help you prepare
9 CDL test sections - 33-159 questions each. Pick a section to start a focused practice test or drill - each one mirrors a real Iowa Iowa DOT CDL exam section.
Iowa requirement to pass
50 questions on the real test, 80% passing score (40 of 50), no time limit
Set your CDL goal
We'll focus your study path and IQ Readiness Score on what you actually need.
License class
Endorsements
Optional
Combined endorsements
Iowa CDL test sections
The Iowa CDL exam is made up of a general knowledge test plus separate endorsement and section tests. Pick a section to start a focused practice test or drill.
Practice Runs
Complete practice runs to test your knowledge. Runs 1-2 are free.
Iowa CDL Test 1: General Knowledge
Safe driving techniques, vehicle systems, cargo basics, hours of service
Iowa CDL Test 2: Air Brakes & Pre-Trip
Air brake systems, inspection procedures, stopping distances, pre-trip checklist
Pro Study Tools
Unlock the full learning system to maximize your chances of passing.
Iowa CDL Exam Simulator 2026
ProIQ Readiness Score™ Analysis
ProIowa CDL Quick Quiz
ProKnow exactly when you're ready
The IQ Readiness Score™ measures six dimensions of CDL test readiness: memory stability, test performance, content coverage, recent accuracy, difficulty mastery, and reaction speed.
About the Iowa CDL Knowledge Test
To obtain a Commercial Driver's License in Iowa, you must first pass the CDL general knowledge written test administered by the Iowa DOT. The general knowledge exam consists of 50 multiple-choice questions covering vehicle inspection, basic control, safe driving, transporting cargo, and federal regulations. A score of 80% or higher (40 correct) is required to pass.
CDL Classes and Endorsements
Iowa issues three CDL classes. Class A covers combination vehicles over 26,001 lbs GVWR when the towed unit exceeds 10,000 lbs - this is what you need for tractor-trailers and most heavy hauling. Class B covers single vehicles over 26,001 lbs such as straight trucks, large buses, and dump trucks. Class C covers vehicles designed for 16+ passengers or those carrying hazardous materials that don't meet Class A or B criteria.
Beyond the general knowledge test, you may need additional written tests for endorsements: Hazardous Materials (H), Tanker (N), Passenger (P), School Bus (S), Doubles/Triples (T), or the combined HazMat-Tanker (X). Each endorsement requires its own written exam, and HazMat also requires a TSA background check.
Entry-Level Driver Training (ELDT)
Since February 2022, federal law requires Entry-Level Driver Training (ELDT) through an FMCSA-registered training provider before you can take the CDL skills test for a Class A or B CDL. ELDT is also required before adding Hazardous Materials, Passenger, or School Bus endorsements. This applies in Iowa and every other state.
Where to Take the Test
The CDL knowledge test is taken at Iowa DOT service center, at participating schools, or at home through the Skip the Trip program. Walk-ins are typically accepted, though scheduling ahead is recommended. The test is available in English, Spanish, Arabic, Bosnian. Results are delivered immediate at dot offices. skip the trip home tests take 7–14 days to process.
Preparing for Your CDL Test
The CDL test draws from the Iowa CDL Manual and the federal Motor Carrier Safety Regulations. Key topics include pre-trip vehicle inspection procedures, air brake systems, coupling and uncoupling, cargo securement, hours-of-service rules, hazard perception, and accident procedures. Iowa-specific regulations on weight limits, required permits, and designated truck routes may also appear.
Taking practice tests before your appointment is one of the most effective ways to prepare. Focus on understanding road signs and the concepts behind each question rather than memorizing answers - the real test may phrase questions differently than what you studied.
Retake Policy
Can retake the next calendar day. Up to 3 attempts within 90 days of application. Must pay retest fee each time.
How hard is Iowa's CDL test, really?
7th easiest of 51.
Know exactly when you're ready
The IQ Readiness Score™ measures six dimensions of CDL test readiness: memory stability, test performance, content coverage, recent accuracy, difficulty mastery, and reaction speed.