Virginia CDL Double/Triple Trailers Practice Test

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A driver disconnects the emergency line first while uncoupling and the trailer moves unexpectedly. What procedural issue is involved?

Air and brake control were not managed in a safe uncoupling sequence with the trailer secured Emergency lines are decorative only Disconnecting emergency first always releases all parking brakes safely The landing gear caused the trailer to accelerate

Correct Answer:

Air and brake control were not managed in a safe uncoupling sequence with the trailer secured

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