Iowa CDL Endorsements
Endorsements are add-ons to your Iowa CDL that authorize specific vehicle types or cargo. Each requires a separate knowledge test, taken through Iowa Department of Transportation, and the endorsement codes are federal, so a Iowa endorsement is recognized in every state. With grain and agribusiness, pork and food processing, wind energy equipment shaping Iowa freight, the examples under each endorsement show where that endorsement pays off locally.
Not all endorsements apply to every CDL class. Use the CDL Selector to find what you need.
When It's Required in Iowa
In Iowa (IA), required to transport any quantity of hazardous materials that require placarding under federal HazMat regulations.
What to Study for the IA Test
For the Iowa (IA) Hazardous Materials test, study shipping papers, placard and label selection, safe loading and segregation, emergency response procedures, and security-awareness requirements under federal law.
Hazardous Materials in Iowa (IA)
- Grain and agribusiness: anhydrous ammonia and crop chemicals under placards
When It's Required in Iowa
In Iowa (IA), required for vehicles designed to transport liquids or gases in a tank permanently or temporarily attached to the vehicle, with individual tank capacity of more than 119 gallons.
What to Study for the IA Test
For the Iowa (IA) Tank Vehicles test, study liquid surge and baffled tanks, outage allowances, inspections, high-center-of-gravity handling, and rollover prevention strategies.
Tank Vehicles in Iowa (IA)
- Grain and agribusiness: liquid fertilizer and anhydrous ammonia tanks for the growing season
- Farm machinery: juice, wine, and liquid food tankers where the crop calls for it
When It's Required in Iowa
In Iowa (IA), required for commercial vehicles designed to carry 16 or more passengers including the driver: charter buses, transit coaches, and similar vehicles.
What to Study for the IA Test
For the Iowa (IA) Passenger test, study passenger safety protocols, controlled loading and unloading, emergency door operation, on-road passenger management, and distracted-driving rules.
Passenger in Iowa (IA)
- Farm machinery: farm labor crew buses carrying 16 or more workers
- Transit agencies, charter companies, and church or community buses across Iowa
When It's Required in Iowa
In Iowa (IA), required for any driver transporting school-age students in a vehicle classified as a school bus under federal or state law.
What to Study for the IA Test
For the Iowa (IA) School Bus test, study student loading zones, stop-signal arm procedures, railroad crossing rules, mirror adjustment, emergency evacuation drills, and state-specific school bus regulations.
School Bus in Iowa (IA)
- Iowa school districts and their contractors: every route driver needs S plus P
- Activity and athletics trips, which use the same S-endorsed drivers
When It's Required in Iowa
In Iowa (IA), required to pull double or triple trailers where permitted by state law. Common in regional and long-haul freight operations.
What to Study for the IA Test
For the Iowa (IA) Doubles & Triples test, study coupling and uncoupling double and triple combinations, pull-out stability, off-tracking behavior, full combination inspections, and safe following distance.
Doubles & Triples in Iowa (IA)
- Grain and agribusiness: double grain hoppers at harvest where the state allows them
When It's Required in Iowa
In Iowa (IA), required for any vehicle equipped with an air brake system, which covers most Class A tractor-trailers and many Class B straight trucks.
What to Study for the IA Test
For the Iowa (IA) Air Brakes test, study air brake components, dual-circuit systems, inspection procedures, warning devices, pressure gauges, and stopping distance at highway speeds.
Air Brakes in Iowa (IA)
- Pork and food processing: livestock and reefer tractors on air brakes
- Wind energy equipment: heavy-haul tractors on wind projects
- Almost every Class A and Class B vehicle in Iowa; skip this test and your CDL carries an L restriction
When It's Required in Iowa
In Iowa (IA), essential for Class A drivers operating tractor-trailers, lowboys, and other multi-unit combinations over federal weight thresholds.
What to Study for the IA Test
For the Iowa (IA) Combination Vehicles test, study coupling and uncoupling procedures, air line connections, trailer handling characteristics, off-tracking, and full combination vehicle inspections.
Combination Vehicles in Iowa (IA)
- Grain and agribusiness: grain hoppers from elevators to processors and terminals
- Pork and food processing: livestock trailers and refrigerated meat loads
- Wind energy equipment: oversize wind-turbine blade and tower loads on specialized trailers
- Farm machinery: refrigerated produce loads to distribution centers and out of state
Not sure which Iowa CDL endorsements you need?
Answer a few questions about your vehicle and operation, and the Iowa CDL Selector Tool pinpoints the endorsements you need in Iowa.