Proposals well advanced to require tyre pressure monitoring ICs in all 5
tyres of all new US cars.
80 million per annum market.

Hopefully this would see a drop in pressure sensor prices - or at least a
low relative cost for the associated ICs (each with integrated sensors &
typically 4 bit RISC processors and RF transmitter.

    http://www.eet.com/sys/news/OEG20031126S0044

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