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Stop harder than you would otherwise.
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Use extra braking force to ensure the ABS kicks in.
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Brake as you normally would.
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Brake using less pressure than you would otherwise use.
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Illinois CDL Permit Test - Combination
(From the 2021 Illinois CDL driver handbook)
| Number of questions: | 20 |
| Passing score: | 16 |
Directions:
All applicants who are applying for a Class A CDL should be prepared to take the Combination test. This test covers information found in Section 6 of the Illinois Commercial Driver's License Study Guide. Section 6 provides the information needed to safely operate tractor-trailers, doubles, triples, and straight trucks with trailers. The test is made up of 20 multiple-choice questions, and applicants will need to correctly answer a minimum of 16 questions to pass. The Combination test is not a replacement for the Double/Triple endorsement test.
Passing grade —
4 or fewer errors
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1.
When driving a tractor-trailer equipped with ABS, you should:
2.
To test the trailer service brakes, you should:
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Move the vehicle forward slowly and apply the brakes with the brake pedal.
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Reverse the vehicle slowly and apply the brakes with the hand control.
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Reverse the vehicle slowly and apply the brakes with the brake pedal.
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Move the vehicle forward slowly and apply the brakes with the hand control.
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3.
A trailer will be most likely to swing around when:
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It is full.
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Traveling in a straight line.
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It is empty.
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The wheels are rotating.
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4.
The emergency air line:
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Is controlled by the foot brake.
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Is connected to the relay valves.
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Supplies air to the trailer air tanks.
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Prevents skids.
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5.
Compared to other commercial motor vehicles, combination vehicles need more space on the road because they are longer and they:
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Need more space to turn and stop.
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Drive more slowly.
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Are twice the width.
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Swerve more often.
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6.
Using the trailer hand brake while experiencing a trailer jackknife will:
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Stop the skid.
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Straighten the trailer.
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Increase traction.
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Continue the skid.
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7.
Which of the following types of vehicles is most prone to the “crack-the-whip" effect?
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An automobile
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A three-axle tractor
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A bobtail tractor
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A triple combination
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