How should the air lines between trailers be routed in a doubles or triples combination?

a.Dragging on the ground for easy inspection

b.Supported so they do not hang down and become tangled or caught

c.Wrapped tightly around the dolly frame

d.Left loose for flexibility

Explanation

Air lines between trailers should be properly supported so they do not sag, drag on the ground, or become tangled. Damaged or snagged air lines can cause loss of braking ability in the rear trailers.

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About the CDL Exam

The CDL (Commercial Driver License) exam tests your knowledge of commercial driving rules, safety procedures, and vehicle operation. You must score 80% or higher to pass the written knowledge test. The exam covers general knowledge, air brakes, combination vehicles, and various endorsements.

This question is from the Double/Triple Endorsement Test #1 section. Practice with more questions from this category to build confidence before taking the official DMV test.

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