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RFID stuff is getting good. I have a little sticker on the windshield of the car that is RFID... When I drive under the sensor on the toll roads in OK it knows it is me, and deducts the proper toll from my account balance....
Sticker is like 3x3 and and has one spot that is a bit thicker, I've yet to go too fast for it to read, and the sensor is high enough up there that trucks pass under it...
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