Surveillance via Tire Pressure Monitoring Systems

How do I surveille thee?* Let me count the ways...™

In April 2005, National Highway Traffic Safety Administration issued a rule requiring automakers to install TPMS sensors in all new passenger cars and trucks starting in September 2007... With minor limitations, TPMS can be used for the very purpose of tracking your vehicle in real time with no substantial investments! TPMS can also be used to measure the speed of your vehicle. Similarly to highway/freeway speed sensors that measure traffic speed, TPMS readers can be installed in pairs to measure how quick your vehicle goes over a predefined distance. Technically, it is even plausible to use existing speed sensors to read TPMS data!

[via Schneier]

* with apologies to Elizabeth Barrett Browning