If the fifth wheel locking lever is not locked after the jaws close around the kingpin:

The coupling is not right and should be fixed before driving.. Section 6.4: The coupling is defective. Do not drive.

If the fifth wheel locking lever is not locked after the jaws close around the kingpin:

ANSWER BREAKDOWN
  • A. Incorrect. "The coupling is good." is not correct. The coupling is defective. Do not drive.
  • B. Correct. The coupling is defective. Do not drive.
  • C. Incorrect. "You should drive slowly." is not correct. The coupling is defective. Do not drive.
  • D. Incorrect. "Use a chain." is not correct. The coupling is defective. Do not drive.