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A building used to handle extra shipping traffic on your harbor coast.
When building a large number of piers to handle a lot of traffic on a coast, realize that the placement of the piers creates a queue ID for each pier. The lower pier IDs will be first in the queue of your ships approaching your harbor at each coastal zone.
A pier has a base loading speed of 2t of goods per second. Loading speed reduction items in Harbormaster buildings do not affect piers.