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Tire pressure monitoring systems have been required on new cars beginning 2008 due to the defective Firestone tire debacle that occurred in 2000.
The tire pressure monitoring systems are based on battery-powered radio frequency identification (RFID) tags affixed to each tire. An electronic control system within the car wirelessly queries each tire and they respond with their air pressure readings.
Scenarios such as the capture of tire sensor IDs by roadside tracking devices could be used to prove that a driver (or at least their automobile) visited potentially sensitive locales - medical facilities, bars, meetings, etc.