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In September of 1958 the Class D CB service was created on the 11-meter band at 27 Megacycles, and this band became what is popularly known today as CB (Citizen Band) Radio. Originally there were 23 CB channels until the 40-channel band plan was implemented in 1977. Channel 9 was designated for emergency use and channel 19 became widely adopted for truck drivers and highway traffic communication. [[File:arc_electronics-cb-nb-anl.png]]