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Are not used on trucks.
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Are only used on tucks carrying hazardous materials.
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Allow drivers to stay in control when braking.
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Idaho CDL Permit Test - Double
(From the 2021 Idaho CDL driver handbook)
| Number of questions: | 20 |
| Passing score: | 16 |
Directions:
This endorsement is required if the driver will pull two or three trailers. To receive this endorsement, applicants must pass a test. The test consists of 20 multiple choice questions. To pass, the applicant must answer at least 16 questions correctly. Each question has three possible answer choices. Test questions come from the Idaho Commercial Driver’s License Manual. Questions come from chapters covering: Driving Safely, Transporting Cargo Air Brakes (if applicable), Combination Vehicles and Doubles and Triples. The Double/Triple endorsement can be used with the Class A CDL.
Passing grade —
4 or fewer errors
advertising
1.
Anti-Lock Braking Systems (ABS):
2.
When trying to put out an electrical fire, you should:
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Use water.
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Use a B:C extinguisher.
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Use an X extinguisher.
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3.
To help prevent a rollover, cargo should be:
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Placed as high as possible inside a trailer.
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Placed as low as possible inside a trailer.
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Placed on the driver’s side of a trailer.
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4.
A cracked rim should be:
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Repaired by welding.
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Relocated to one of a pair of dual tires.
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Replaced.
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5.
If you are feeling tired and yawning a lot while you are driving, you should:
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Pull over and take a nap.
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Get some coffee.
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Drive faster.
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6.
If there is a cargo fire in a box trailer:
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The trailer doors should be opened.
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The trailer doors should not be opened.
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A large, heavy blanket should be put over the trailer.
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7.
Always perform the steps of a pre-trip inspection in the same order each time because:
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You will be less likely to forget something.
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You will have more time to complete the inspection.
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It is required by law.
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