Iowa School Bus CDL Practice Test

This is a free 20-question practice test for the School Bus portion of the Iowa Commercial Driver's License knowledge exam. Questions are pulled from a pool of 55 drawn from the AAMVA CDL Manual, which is the source document the Iowa Department of Transportation Motor Vehicle Division uses to write its actual exam.

How it works: Click an answer. The correct choice highlights in green, and you'll see a short explanation. Aim for 85% or better before you sit for the real test in Iowa.

Question 1 of 20

After unloading at the end of the route, the driver must:

Walk through the bus to check for sleeping or hiding students, lost items, damage
Skip the walkthrough
Lock and leave
Only check the front

Correct. Always walk every aisle and check every seat. Sleeping children left aboard a parked bus is a recurring tragedy that the post-trip walk prevents.

Question 2 of 20

Student management is important because:

Distracted driving by managing students causes crashes
It does not affect driving
Only the bus matters
Students never affect safety

Correct. Distracted driving from student-management issues is a leading cause of school-bus crashes. Pull off safely to address behavior.

Question 3 of 20

Before resuming travel after a stop, the driver should:

Mirror-check, count students, verify all are clear of the danger zone, deactivate the lights, then proceed slowly
Drive immediately
Only check the rear
Skip the count

Correct. Mirror sweep, count crossing students, verify clear danger zone, deactivate lights and stop arm, proceed slowly.

Question 4 of 20

After delivering students to school in the morning:

Walk through the bus to verify no students remain
Lock and leave immediately
Only walk if requested
Skip the walk

Correct. Walk every aisle, every seat. Confirm bus is empty before leaving for the day or for the next trip.

Question 5 of 20

A school bus must stop at every railroad crossing:

Yes, with limited exceptions
No, never
Only if a train is in sight
Only at night

Correct. School buses must stop at every railroad crossing 15 to 50 feet from the nearest rail. Open the entrance door and driver window, look and listen, then proceed without shifting gears.

Question 6 of 20

The school bus stop arm:

Extends to signal traffic to stop while children load or unload
Is decorative
Is for parking
Is optional

Correct. The stop arm signals approaching traffic to stop. Drivers who pass a stopped school bus with red lights flashing face heavy fines.

Question 7 of 20

When a school bus is involved in a crash:

Render aid as you can, secure the area, notify dispatch and authorities, evacuate students if there is danger of fire or further crash
Continue route
Skip notification
Drive on

Correct. Render aid, secure the area with warning devices, notify dispatch and authorities. Evacuate students if there is danger of fire, fuel spill, downed lines, or secondary crash.

Question 8 of 20

During a fire on the bus, you should:

Stop in a safe area, evacuate students upwind from the fire, move them to a safe distance, call 911
Continue driving
Only fight the fire
Have students stay aboard

Correct. Stop, evacuate upwind to a safe distance (≥100 feet off the road), call 911. Use extinguisher only on small fires you can safely manage.

Question 9 of 20

When you arrive at a school for unloading, you should:

Stop in the designated unloading area, set parking brake, follow school traffic-control instructions
Stop in the road
Drive into the school yard
Honk to clear traffic

Correct. School unloading is at designated stops with school staff and traffic-control patterns. Follow them.

Question 10 of 20

A school bus must have functioning:

Emergency exits, all signal lights, stop arm, mirrors, fire extinguisher, first-aid kit, body-fluid clean-up kit, reflective triangles
Only the engine
Only seats
Only brakes

Correct. School-bus equipment list is more extensive than other CMVs. All items must be in working order.

Question 11 of 20

The minimum distance the front bumper of a stopped school bus should be from waiting students at the stop:

At least 10 feet
As close as possible
At least 1 foot
At least 50 feet

Correct. Stop with the front bumper at least 10 feet from waiting students so they have to walk forward to enter the bus, ensuring the driver can see them.

Question 12 of 20

A "post-trip" inspection of the school bus should include:

Walk every aisle, check every seat, check restrooms or rear compartments where applicable
Skip the walk-through
Look only at front
Skip seats

Correct. Post-trip = walk every aisle, check every seat, all compartments. Document on DVIR.

Question 13 of 20

A school bus evacuation is required when:

Fire is on or in the bus, the bus is in danger of fire (downed wires, fuel spill), the bus is on or near tracks, the bus is in path of a train, or the bus is in danger of being hit
Only when the bus is empty
Only at night
Only after a flat tire

Correct. Evacuate for fire, danger of fire, on/near railroad tracks, in path of a train, or danger of being hit by another vehicle.

Question 14 of 20

A school bus driver who notices fluid leaks during pre-trip:

Should determine the type and source, and not put the bus in service if any safety-critical leak is found
Ignore them
Only address oil leaks
Address only at end of day

Correct. Identify what is leaking. Brake-fluid, fuel, or coolant leaks render the bus unsafe. Repair before service.

Question 15 of 20

When the bus must stop because of crossing students, you should also:

Use the crossing-control arm (if equipped), signaling students to walk far enough in front of the bus to be seen
Skip the crossing arm
Have them walk behind
Have them run

Correct. The crossing-control arm extends in front of the bus, forcing students to walk where the driver can see them.

Question 16 of 20

Drivers transporting students with special needs should:

Receive additional training, use proper lifts and securement, follow individualized plans (IEPs)
Have no special training
Skip securement
Drive faster

Correct. Special-needs transport requires extra training, equipment use, and adherence to individual plans (IEPs / 504 plans).

Question 17 of 20

Bullying or fighting on the bus:

Pull off safely if behavior is dangerous, address per district policy, report incidents
Continue route
Encourage peers to intervene physically
Speed up

Correct. Pull off safely if behavior endangers driving. Address verbally and document per district policy. Notify school administration.

Question 18 of 20

When a school bus is on a divided highway with a barrier or median:

Some states allow vehicles on the opposite side not to stop when the bus is stopped — verify state law
Always require stop
Always require pass
Are not regulated

Correct. Most states exempt opposing traffic on divided highways with a physical barrier. Some require all traffic to stop. Know your state law.

Question 19 of 20

The "danger zone" around a school bus is generally:

10 feet in front, on each side, and behind the bus, plus any area required for the bus to maneuver
Only behind the bus
Only in front
5 feet on each side

Correct. The danger zone extends 10 feet in front, 10 feet on each side, and 10 feet behind the bus, plus the area needed to maneuver. Most students killed by their own bus are in this zone.

Question 20 of 20

When approaching the bus stop, you should activate the alternating amber warning lights:

About 200 feet in advance (more in 50+ mph zones)
At the stop
After unloading
Only at night

Correct. Activate amber warning lights about 200 feet before the stop (further in higher-speed zones), giving traffic time to slow.

About the Iowa School Bus exam

Most states administer 20 School Bus questions and require 80% to pass. The exam emphasizes loading and unloading procedures, the danger zone around the bus, emergency exit and evacuation procedures, railroad-highway crossings, and student management.

The Iowa Department of Transportation Motor Vehicle Division follows the federal CDL standards established by FMCSA. To earn the School Bus credential, you must answer at least 80% of the questions correctly. Many candidates score lower the first time because the test pulls from a large pool — refreshing this page will give you a different mix of questions, drawn from the same authoritative source.

Want more practice? Try the full School Bus question bank or browse all Iowa CDL practice tests.