The fifth wheel locking lever is not locked after the jaws close around the kingpin. This means that
a) The coupling is not right and should be fixed before you drive the coupled unit
b) The trailer will not swivel on the fifth wheel
c) The parking lock is off and you may drive away
Answer: a) The coupling is not right and should be fixed before you drive 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.