Greetings,
How i see this matter,is one AI vessel leaves the quay,and the other,which started from another quay,would arrive.
You with your vessel,cannot moor there,because their are no moorings for your vessel,and if your in the way of the AI vessel,which arrive.The system will be temporarly stoped.
I hope you see my vision on this,afther my explaination.
Regards
Marc