Since when does your car have civil liberties? The driver isn't being tracked, or the passengers, (or the contents of the vehicle for that matter). The vehicle could be operated by anyone, and contain anyone or anything. However, if (and only if) the whereabouts of a particular car becomes of interest (IE it is connected with a crime,) then the information that has been gathered can be searched to determine the movement of that vehicle. Otherwise, no one wants to know that your car was seen parked in front of the topless bar at 2 am. No one is looking at or for that piece of information. No one cares.
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Since when does your car have civil liberties? The driver isn't being tracked, or the passengers, (or the contents of the vehicle for that matter). The vehicle could be operated by anyone, and contain anyone or anything. However, if (and only if) the whereabouts of a particular car becomes of interest (IE it is connected with a crime,) then the information that has been gathered can be searched to determine the movement of that vehicle. Otherwise, no one wants to know that your car was seen parked in front of the topless bar at 2 am. No one is looking at or for that piece of information. No one cares.