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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 driving in very hot weather, you may have to:
decrease your following distance.
increase your speed until the tires cool off.
reduce your speed to prevent overheating.
2. Baggage and freight should be secured in a way that:
allows riders to quickly take their baggage with them in an emergency.
allows riders to exit by any window or door in an emergency.
allows riders to easily identify their baggage before they get off the bus in an emergency.
3. The driver's seat of a bus should have:
an emergency exit handle.
a seat belt.
a pocket for storage.
4. The header board, if equipped, should:
not be used in case of a crash or emergency stop.
never be used for cargo.
block the forward movement of any cargo you carry.
5. If you experience a tire failure, do NOT:
hold the steering wheel firmly.
stay off the brake (unless you're about to run into something).
apply the brakes as hard as you can.
6. To know if your vehicle is equipped with ABS, look for:
an ABS placard.
a yellow ABS malfunction lamps on the instrument panel.
the ABS logo on the steering wheel.
7. Buses must never carry:
emergency hospital supplies.
oxygen medically prescribed for, in the possession of a passenger, and in a container designed for personal use.
radioactive materials in the space occupied by people.
8. At railroad crossings, you must stop no closer than ___ feet and no farther than ___ feet from the nearest rail.
25; 75
50; 100
15; 50
9. Skids caused by acceleration can usually be stopped by:
applying the brakes firmly.
swerving to the right.
taking your foot off the accelerator.
10. To prevent getting sleepy while driving, you should:
drive alone whenever possible.
keep the cab warm.
keep cool by opening the window.
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IA CDL Bus Test

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