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It is for the Traffic Program-the TP button on the radio is to bring in traffic conditions that are allegedly broadcast by some radio stations and interrupt whatever else you happen to be listening to. I only ever saw it work once, I was way South on the NJ Turnpike about 5 years ago and suddenly my radio tuned to my iPod FM transmitter was interrupted with a local traffic report. Most of the time the radio just randomly beeps and says NO TP unless the function is disabled.
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