On newer cars, there is actually a chip in there (the valve stem, where you put air in your tire) for the tire pressure monitoring system. It tells you what pressure each tire is at on the dashboard.
Oh yeah! I've seen that monitoring thingy in some cars like the ones that have a screen and stuff, I did wonder how it knew the pressure of the tires X3 ty for tye info! :>
Because each tire transmits a unique identifier, vehicles may be easily tracked using existing sensors along the roadway.[19] This concern could be addressed by encrypting the radio communications from the sensors but such privacy provisions were not stipulated by the NHTSA.
See the white, metal looking thing in the image? That's another tracking device from the government to track people wherever they do. They even put it in all 4 of your wheels so they will know when to issue you a traffic ticket. Remove them. /s