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The school bus endorsement applies to applicants who wish to drive a school bus in any Class A or B CDL. To add an S endorsement to your CLP/CDL, you must pass the Washington school bus test, and you must also pass skills tests in a school bus. The WA CDL bus test consists of 20 questions, and you'll need at least 16 correct answers to pass (80%). The knowledge test covers the following sections of the Washington CDL Manual: School Buses, Vehicle Inspection Test, Basic Control Skills Test and Road Test. After studying, take this WA CDL practice test to prepare for the actual bus test!
1. After unloading at the school, you should walk through the bus to:
to check for items left by students and hiding or sleeping students.
close the door.
make sure no students are returning to the bus.
2. Emergency brakes must be held on by:
mechanical force.
air pressure.
hydraulic pressure.
3. Emergency roof hatches:
may be partially opened for fresh air.
must never be opened while driving.
should be left opened as a regular practice.
4. How does ABS help you?
ABS makes stab braking more effective.
ABS replaces your normal brakes and helps you  to stop faster.
ABS helps you avoid wheel lock up and maintain control when you brake hard on slippery surfaces.
5. If your school bus is equipped with ABS, it will have:
a yellow ABS malfunction lamp on the instrument panel.
an ABS certification on the driver’s side area of the bus.
None of the above.
6. When stopping, drivers should bring the school bus to a full stop with the front bumper at least ______ away from students at the bus stop.
10 feet
50 feet
30 feet
7. You are driving a school bus, When approaching a railroad crossing you should:
activate the 4-way emergency flashers.
cross the tracks in a high gear.
stop no closer than 5 feet from the tracks.
8. Road surfaces where water collects can create conditions that cause a vehicle to hydroplane. Which of the following is an indication of standing water?
Clear reflections
Tire splashes
All of the above.
9. Students should board the bus:
only when signaled by the driver.
only if the driver knows their names.
10. When you are about to pass a vehicle, you should:
slow down.
assume they don't see you.
make gestures.
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WA CDL Bus Test

Number of questions: 20
Correct answers to pass:16
Passing score:80%
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