Missouri CDL Endorsements
Endorsements are add-ons to your Missouri CDL that authorize specific vehicle types or cargo. Each requires a separate knowledge test, taken through Missouri Department of Revenue, and the endorsement codes are federal, so a Missouri endorsement is recognized in every state. With agriculture and grain, automotive assembly, beer and beverage distribution shaping Missouri 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 Missouri
In Missouri (MO), required to transport any quantity of hazardous materials that require placarding under federal HazMat regulations.
What to Study for the MO Test
For the Missouri (MO) 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 Missouri (MO)
- Agriculture and grain: anhydrous ammonia and crop chemicals under placards
- Beer and beverage distribution: cleaning agents, batteries, and other placarded retail freight
When It's Required in Missouri
In Missouri (MO), 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 MO Test
For the Missouri (MO) Tank Vehicles test, study liquid surge and baffled tanks, outage allowances, inspections, high-center-of-gravity handling, and rollover prevention strategies.
Tank Vehicles in Missouri (MO)
- Agriculture and grain: liquid fertilizer and anhydrous ammonia tanks for the growing season
- Beer and beverage distribution: beverage, dairy, and food-grade liquid tankers
When It's Required in Missouri
In Missouri (MO), 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 MO Test
For the Missouri (MO) Passenger test, study passenger safety protocols, controlled loading and unloading, emergency door operation, on-road passenger management, and distracted-driving rules.
Passenger in Missouri (MO)
- Transit agencies, charter companies, and church or community buses across Missouri
When It's Required in Missouri
In Missouri (MO), 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 MO Test
For the Missouri (MO) 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 Missouri (MO)
- Missouri 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 Missouri
In Missouri (MO), 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 MO Test
For the Missouri (MO) 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 Missouri (MO)
- Agriculture and grain: double grain hoppers at harvest where the state allows them
- Beer and beverage distribution: twin 28-foot LTL trailer sets on the interstates
When It's Required in Missouri
In Missouri (MO), 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 MO Test
For the Missouri (MO) 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 Missouri (MO)
- Automotive assembly: the tractors and straight trucks on every plant route
- Aerospace components: the heavy-haul tractors and straight trucks on aerospace plant routes
- Almost every Class A and Class B vehicle in Missouri; skip this test and your CDL carries an L restriction
When It's Required in Missouri
In Missouri (MO), essential for Class A drivers operating tractor-trailers, lowboys, and other multi-unit combinations over federal weight thresholds.
What to Study for the MO Test
For the Missouri (MO) Combination Vehicles test, study coupling and uncoupling procedures, air line connections, trailer handling characteristics, off-tracking, and full combination vehicle inspections.
Combination Vehicles in Missouri (MO)
- Agriculture and grain: grain hoppers from elevators to processors and terminals
- Automotive assembly: just-in-time parts loads between assembly plants and suppliers
- Beer and beverage distribution: regional and over-the-road tractor-trailer distribution runs
- Aerospace components: oversize aircraft sections and aerospace components on specialized flatbed and step-deck trailers
Not sure which Missouri CDL endorsements you need?
Answer a few questions about your vehicle and operation, and the Missouri CDL Selector Tool pinpoints the endorsements you need in Missouri.