If the fifth wheel locking lever is not locked after the jaws close around the kingpin:
A. The trailer will not swing on the fifth wheel.
B. The hand valve is released and you may drive away.
C. The coupling is not correct and should be corrected before driving the coupled unit.
Answer: C. The coupling is not correct and should be corrected before driving the coupled unit.
If the answers is incorrect or not given, you can answer the above question in the comment box. If the answers is incorrect or not given, you can answer the above question in the comment box.