Iowa CDL Practice Tests
Free commercial driver license practice tests for Iowa.
General Knowledge Practice Test
Study general CDL knowledge including vehicle inspection, basic control, safe driving, and cargo handling.
Air Brakes Practice Test
Learn about air brake systems, components, inspection procedures, and emergency braking techniques.
Combination Vehicles Practice Test
Practice questions on coupling/uncoupling, rollover prevention, and safe operation of combination vehicles.
Hazmat Practice Test
Prepare for the hazardous materials endorsement covering handling, placards, shipping papers, and emergency procedures.
Tanker Vehicles Practice Test
Study tanker vehicle operations including liquid surge, baffled vs unbaffled tanks, and safe driving techniques.
Passenger Practice Test
Practice for the passenger endorsement exam covering loading, unloading, emergency exits, and passenger safety.
School Bus Practice Test
Prepare for the school bus endorsement covering student loading zones, railroad crossings, and emergency procedures.
Doubles & Triples Practice Test
Study doubles and triples operations including coupling, turning, inspecting, and safe driving practices.
Pre-Trip Inspection Practice Test
Master the pre-trip inspection process covering all vehicle components you must check before driving.