Transport for London to track Tube users in stations by their MAC addresses

‘Transport for London is to start a four week trial of reading Wi-Fi connection request data from London Underground passengers’ mobile phones.
The trial, which will last four weeks from 21 November, “will help give TfL a more accurate understanding of how people move through stations, interchange between services and how crowding develops,” according to the transport authority.
The idea is to develop a more accurate picture of how passengers make interchanges on the Tube network.
Data available to TfL at present only records where people enter the London Underground and where they leave it, meaning figuring out their movements in between those points is a matter of educated guesswork.’
Read more: Transport for London to track Tube users in stations by their MAC addresses