From the comparison of each indicator, queuing system (2) is superior to queuing system (1).
The conclusion can be made: under the similar stevedoring condition and depth of water in one port, ships should
better be form a line by arriving the pilot anchorage, and then berth alongside successively to load or unload the
cargoes, rather than to form the line in the pilot anchorage ahead of each dock which will form the three independent
queues. The latter queuing form will generate unreasonable usage of stevedoring resources which will ultimately
bring about low probability of the stevedoring equipment, long waiting time and high cost of stevedoring.