Is there any logic to the queueing system for car ferries?

The long-running series in which readers answer other readers’ questions on subjects ranging from trivial flights of fancy to profound scientific conceptsIs there any logic applied by the guardians of the ferry queues at a terminal? Why does lane 5 load after lane 11 or whatever? Why do the cars in a lane get paused halfway through, only for a totally different lane to get star treatment? No matter whether I arrive early or late, I always seem to end up being the last to board.George Foste