  This document describes the application of a differentially private algorithm
to release public transport usage data from Transport for New South Wales
(TfNSW), Australia. The data consists of two separate weeks of "tap-on/tap-off"
data of individuals who used any of the four different modes of public
transport from TfNSW: buses, light rail, train and ferries. These taps are
recorded through the smart ticketing system, known as Opal, available in the
state of New South Wales, Australia.
