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Smart Billboards
djdanlib writes "The New York Times ran this story Sunday about the Mobiltrak smart billboard system. It works by detecting what radio station you're listening to as you pass by a billboard, then displaying advertisements targeted at that station's demographic. It's kind of like a real-time Nielsen Ratings system for radio. And it's entirely passive, requiring no special hardware in your car - it receives the faint tuning signal generated by your radio." We've mentioned these before.
I agree, and you're most likely right. I'm one of those weird people that gets prepared before they go out.