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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 Iowa school bus test, and you must also pass skills tests in a school bus. The IA 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 Iowa CDL Manual: School Buses, Vehicle Inspection Test, Basic Control Skills Test and Road Test. After studying, take this IA CDL practice test to prepare for the actual bus test!
1. When confronted by an aggressive driver you should not:
make eye contact.
try to get out of their way.
put aside your pride.
2. Service brakes should:
be checked before each trip.
only be checked by a mechanic.
always be checked before applying the brakes.
3. You must have at least _____ inch tread depth in every major groove on front tires.
4. A school bus driver must evacuate the bus when:
the ABS is not working properly.
the bus is stalled on a railroad crossing.
you have pull off the road and stop.
5. When approaching a vehicle with a distracted driver, you should:
quickly pass the vehicle.
change lanes quickly.
maintain your safe following distance.
6. To make the brakes work, air brakes use:
compressed air.
hydraulic air.
7. How does ABS help you?
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.
ABS makes stab braking more effective.
8. Which of the following statements about fueling a bus with riders is true?
Fueling your bus with riders on board should be avoided unless absolutely necessary.
It should only be done during trips more than 150 miles long.
Before fueling your bus with riders on board you should tell passengers about the refueling.
9. The posted speed for a curve:
may not be safe for a bus.
is safe for a bus.
is always safe for all vehicles.
10. The driver MUST evacuate the bus when:
there is a threat of a fire.
the position of the bus may change and increase the danger.
All of the above.
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IA School Bus CDL Test

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