The operator of the myki system has given Victoria Police access to private information about the movements of smartcard users, it has been revealed.

The Transport Ticketing Authority today said police had made four requests about customers since December 2009.

The authority, however, was only able to provide information on two of those occasions.

Under the myki privacy policy, a police officer does not need to apply to a court for access to a myki user's private information, they can simply request it in writing.