Smart cards track commuters
Under the new system, Transport for London will be able to track a commuter's movements and it plans to retain information on journeys made for "a number of years".
Each card has a unique ID number linked to the registered owner's name, which is recorded together with the location and time of the exchange every time the card is used.
The data, retained for business purposes, could be released to law enforcement agencies under certain conditions.
Anyone hoping to use a monthly or annual season ticket will have to register their details with Transport for London, although anonymous cards will be available to those willing to pay per journey.
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