@lebronjames75 @alex @Moon @olmitch Funny bit in that is is how cars come with a lot of built-in transmission devices including phones, which various part of the world either made mandatory for new cars or wanted to.
And speed cameras and other license plate recording devices have existed for decades.

Tracking *everyone* walking/cycling is much harder as no everyone keeps their phone on themselves and thanks to smartphones it's shit that gets discharged frequently.