Reply to post:

TfL to track Tube users in stations by their MAC addresses

phuzz Silver badge

Unless the MAC is changing halfway through a journey, they'll probably still be able to get the data they're after.

If they know that (for example) between 08:35 and 08:40 at Liverpool St. a lot of people who've travelled in from affluent neighbourhoods are passing between the Circle line and the Hammersmith and City, they can sell premium advertising at that time, on that junction.

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