Primary function areas.
Primary function areas. For purposes of this part, the primary function of the Postal Service is to provide mail service for its customers, that is to accept, distribute, transport and deliver the mail. Two essential facilities for fulfilling these functions are customer lobby areas where customers conduct their retail transactions, access mail depositories and post office boxes and work room areas where postal employees distribute the mail and perform other core postal operations. Therefore, for purposes of the accessibility guidelines applicable to the Postal Service under the Architectural Barriers Act, two primary function areas are identified: Customer Lobbies and Workroom Areas.