Anyone using Google Now is already sending all the data that constitutes the article's undesirable dystopic vision to Google. And anyone running Android, I suppose, <i>could</i> get an update that began surreptitiously phoning home data. If that's a thing Google wanted to start doing.<p>Short of being in a faraday cage, we also already know cell phones have a habit of not really rendering you 'untrackable' even when lay users think they've turned them off.<p>And, frankly, the phone is a superior vector in the first place, as the car has little idea who's driving it, no real idea who the other occupants might be, and little idea where the occupants <i>actually</i> go when they get out. [1]<p>Yet this article chooses to worry about the cars?<p>I don't see a huge delta between "I have to leave my phone at home to be <i>sure</i> it can't be used to track me" and "I can't use my 'smart' car, if I want to be sure it can't be used to track me".<p>[1] The Gym, the massage parlor and the pizza joint might be in the same strip mall. Your car can't know one or ones you go to, whether you get into a subsequent vehicle and go somewhere else entirely, etc. Your phone can know <i>exactly</i> where you're going, and for how long. The car's data is far inferior. Rather than being a data detectives <i>dream</i>, it seems more like a "better than nothing" fall-back, if the tracked-individual happened to <i>actually</i> leave their phone at home or properly disable it.<p>And anyone smart/aware enough to prevent themselves from being tracked by their phone is smart/aware enough to take a different vehicle, or take the Google car to a transit station/park-and-ride/alibi-establishing-alternate-location/etc.