Tire Pressure Monitoring Systems (TPMS) are comprised of sensors that are designed to measure the tire pressures on a vehicle and then wirelessly transmit the data to a monitoring computer, which will then alert the driver when the tire pressure is incorrectly set.
At the Toorcon conference, Jared Boon has given a talk showing how he used an RTL-SDR and a GNU Radio program that he developed to reverse engineer the TPMS wireless protocol, and read the data that is sent. Jarod also notes that TPMS is potentially a security risk that could be used to track cars. The talk has been uploaded to YouTube and is shown below.
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