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the OP explains it all quite clearly - you should reread the post.

But in a nutshell his point is that by its very nature GPS data collected over a constant time period cannot be anonymized. If your car is located >50% of the time in one of two places, chances are one is your home and one is your office. I now know where you live (and thus your identity) and I know where you work.

How do you know they give continuous position on a per car basis? They could break everything up into chunks, or simply give out statistics on average speeds and usage for every road.

Everyone here is assuming anonymize means to remove name but keep everything else intact. I see no indication that this is the case. If there is reason to believe otherwise, point me in that direction.

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