Transport for London is to start capturing depersonalised wi-fi connection data from millions of London Underground passengers’ phones from early July.
TfL ran a four-week pilot of capturing wi-fi data in 2016 and has developed the system in-house.
When a device such as a smart phone has wi-fi enabled, it continually searches for a wi-fi network by sending out a unique identifier – known as a Media Access Control address – to nearby routers.
TfL said...
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