Iowa CDL Practice Test 2026 & Iowa DOT Rules
Prepare for your commercial driver's license with the official Iowa exam curriculum. TruckerPass combines the 985 federal FMCSA questions with Iowa-specific commercial vehicle limits, air brake testing, and the 2026 Modernized Pre-Trip inspection.
Iowa Agricultural Freight & Prairie Crosswinds
- High prairie crosswinds along I-80 frequently cause empty dry-van and refrigerated trailer rollovers; drivers must monitor wind advisories.
- Livestock and grain bulk haulers face specialized liquid surge and shifting weight center of gravity challenges.
- Iowa DOT Motor Vehicle Enforcement maintains fixed weigh stations and roving portable scale patrols on all state freight corridors.
- Iowa DOT requires 80% passing on the 50-question general knowledge test.
Official Iowa Test Format
- Licensing Agency: Iowa Department of Transportation (Iowa DOT)
- General Knowledge: 50 questions, 80% to pass (at least 40 correct).
- Air Brakes Endorsement: 25 questions, 80% to pass (required for air-equipped rigs).
- Combination Vehicles: 20 questions, 80% to pass (Class A tractor-trailers).
- Modernized Pre-Trip Inspection: 4-Zone component walkaround + 4-Step air brake test.
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