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Nowadays, many cities in the world have incorporated information technology to their public transport systems. Santiago, Chile is not an exception, and the new public transport system Transantiago has introduced GPS bus location and a smartcard payment system that provide an excellent opportunity for passive data collection. This is a rather new system, implemented only in 2007, and one important characteristic of the new system is that a very high percentage of the boardings are recorded in a huge Transactions database, and a significant percentage of users that use the same card in all his/her trips (transactions). This characteristic, which is not present in other public transport system, represents an excellent opportunity for public transport planners, as we can follow cards (users) through the system, and identify their travel patterns. This source of information has so much space-time detail that permits …