Earlier quoted context omitted.
> Automobiles are highly regulated and driving is a privilege. There is no _right_ to drive a vehicle from point A to point B, in secret or not. If we accept your premise that the government can spy on you simply because an activity is regulated, then the Fourth Amendment is effectively dead. Under that logic, the state could mandate interior cameras in every heavily regulated business, or search the backpack of ever…
We probably all agree that a cellphone is closely associated with you and acts as a surrogate brain, so it gets treated as "you", at least as much as the _inside_ of your house or car. You the right of free travel (with or without your phone). Automobiles are different. You can't take it everywhere; you can't park it everywhere; you can't move it about in secret (plates MUST be displayed, always). You have an expecta…
Your understanding of privacy misapplies the plain view doctrine. Plain view allows the state to seize evidence provided that the officer seizing the evidence has a lawful right to access or observe the seized object. (Collins v. Virginia)
An officer glancing through a car window is performing a constitutional act.
However, were the state to compile a history of your car's location, which it does, that exposes your "familial, political, professional, religious, and sexual associations." (Jones) This compilation of data is an action legally defined as a search, since it turns up data NOT readily available in plain view. And this search takes place without warrant.