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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. When your route is finished, you should conduct a post-trip inspection of the bus. The inspection should include all of the following except:
Opening windows and doors
Looking for articles left on the bus
Looking for sleeping students
2. Carry-on baggage:
must be left in the aisle.
should not be left in the aisle.
may be left in the aisle.
3. Rough acceleration:
improves gas mileage.
can cause mechanical damage.
is necessary to warm up the engine.
4. The overhead inside rearview mirror is used to:
perform a safe stop at designated unloading areas.
monitor passenger activity inside the school bus.
monitor the blind spot area directly behind the driver’s seat.
5. Pre-trip inspections:
should not be done when a vehicle inspection report is available.
should always be done in the same order.
should not be done unless the vehicle has problems that could cause a breakdown.
6. How many drinks per hour can be handled by the liver?
About 3 drinks per hour.
About 1 drink per hour.
About 2 drinks per hour.
7. When students are boarding the school bus, you should do all of the following except:
count the number of students at the bus stop and ensure all board the bus.
ask the students to board in pairs.
monitor all mirrors continuously.
8. If your bus has a manual transmission:
never change gears while crossing railroad tracks.
cross the railroad tracks in a low gear.
All of the above.
9. When approaching a traffic light that has been green for a long time, you should:
speed up to get through the light.
start slowing down and be ready to stop.
maintain your current speed.
10. The heavier the vehicle:
the more work the brakes must do to stop it.
the less work the brakes must do to stop it.
the higher the center of gravity will be.
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WA CDL School Bus Test

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