Earlier quoted context omitted.
No, they argued these records are akin to a record of the person's travel history. > As Google puts it, and no one seriously disputes, Location History serves as a “diary” or map “of a person’s travels.” "Diary" is a red herring here. They're referring to a location log, just like what Flock produces.
Flock produces a record of a car's travel history. 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 every passenger using public transit without a warrant.
You have a reasonable expectation of privacy for the contents of your trunk, your backpack, and your travel history. The police cannot search your trunk without a warrant just because you are driving on public roads. They should not be able to search your travel history either.