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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. ABS malfunction lamps are located:
on the driver'door.
under the hood.
on the instrument panel.
2. Bus drivers:
are exempt from wearing a seat belt.
are required to wear a seat belt only when transporting passengers.
must wear a seat belt at all times.
3. Your vehicle has air brakes. To stop, you should:
pull the parking brake control knob out.
push the brake pedal down.
release the accelerator, push in the clutch, and shift to Neutral at the same time.
4. If your vehicle is hydroplaning, you should:
accelerate to get through the water as quickly as possible.
use the brakes to slow down.
release the accelerator and push in the clutch.
5. After stopping, you should:
Activate the alternating red lights and ensure the stop arm is extended.
Turn on the right turn signal indicator.
Have the students board the school bus as quickly as possible.
6. The area to the left of the bus is always considered dangerous because of:
blind spots.
passing vehicles.
parked vehicles.
7. You should position convex mirrors to see:
the entire side of the bus up to the mirror mounts.
the front of the rear tires touching the ground.
All of the above.
8. Select the best answer. Danger zones are located:
on all sides of the bus.
to the sides of the bus.
in the front of the bus.
9. When unloading students, a bus driver should:
tell students to exit the bus and walk to a position where they can plainly see the driver.
check around and underneath the bus.
count the number of students to confirm the location of all of them before pulling away from the stop.
10. Active railroad crossings:
do not have any type of traffic control device at the crossing.
have a traffic control device installed at the crossing to regulate traffic.
require drivers to recognize the crossing, search for any train and decide if there is sufficient space to cross safely.
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IA School Bus Test

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