 Each P&DC sorts mail for a given region (typically with a radius of around ) and connects with the national network for interregional mail.The USPS has consolidated mail sorting for large regions into the P&DCs on the basis that most mail is addressed to faraway destinations, but for cities at the edge of a P&DC's region, this means all locally addressed mail must now travel long distances (that is, to and from the P&DC for sorting) to reach nearby addresses.At the P&DC, mail is emptied into hampers which are then automatically dumped into a Dual Pass Rough Cull System (DPRCS).