Autofahrer-Rundfunk-Informationssystem
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Autofahrer-Rundfunk-Informationssystem (ARI, German for: Automotive-Driver's-Broadcasting-Information) was a system for indicating the presence of traffic information in FM broadcasts used by the German ARD network of FM radio stations from 1974.cite-ref-1[1] Developed jointly by IRT and Blaupunkt,cite-ref-2[2] it indicated the presence of traffic announcements through manipulation of the 57kHz subcarrier of the station's FM signal.cite-ref-3[3]
ARI was rendered obsolete by the more modern Radio Data System and the ARD stopped broadcasting ARI signals on March 1, 2005.cite-ref-4[4]
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