What are the barcodes for and how do they speed up delivery?
Barcodes are used to speed up mail sorting. They are in fact a machine-readable version of the ZIP (Postal) code. If there is a barcode printed on the envelope or mailing label, such mailpiece can be scanned and sorted by a machine, which is many time faster and more reliable, than a human. Otherwise, it has to be sorted manually and the delivery time increases.
