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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 Oklahoma school bus test, and you must also pass skills tests in a school bus. The OK 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 Oklahoma CDL Manual: School Buses, Vehicle Inspection Test, Basic Control Skills Test and Road Test. After studying, take this OK CDL practice test to prepare for the actual bus test!
1. Never refuel your bus:
while the windows are open.
in a closed building with riders on board.
with a higher grade of fuel.
2. Brake fade results from:
excessive use of the service brakes.
excessive speeding.
excessive wear.
3. The header board, if equipped, should:
never be used for cargo.
block the forward movement of any cargo you carry.
not be used in case of a crash or emergency stop.
4. If a student is believed to have suffered a neck or spinal injury, you should:
stay as far away from the student as possible.
move the student off the bus.
not move the student.
5. What factors can cause brakes to fail or fade?
Excessive use of the service brakes
Brakes out of adjustment
All of the above.
6. When a tire suddenly blows out while you are driving, what should you do first?
Hold the steering wheel firmly and stay off the brakes.
Brake lightly and hold the steering wheel firmly.
Use controlled or stab braking.
7. A passive railroad crossing is one that:
has a traffic control device installed at the crossing to regulate traffic.
does not have any type of traffic control device.
requires you to stop and wait until the traffic control device installed at the crossing tells you to proceed.
8. To know if your vehicle is equipped with ABS, look for:
an ABS placard.
the ABS logo on the steering wheel.
a yellow ABS malfunction lamps on the instrument panel.
9. When going down a hill, you should downshift:
as you go downhill.
after starting down a hill.
before you start going downhill.
10. When changing lanes, you should:
turn sharply.
do it quickly so other vehicles won't get into the lane.
do it slowly, so a driver you did not see may have a chance to honk their horn.
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OK CDL Bus Test

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