From the comparison of each indicator, queuing system (2) is superior to queuing system (1).
The conclusion can be made: under the similar stevedore 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 stevedore resources which will ultimatelybring about low probability of the stevedore equipment, long waiting time and high cost of stevedore.