The CHP Era and Current Usage
In 1969, when the CHP assumed responsibility for freeway traffic from the LAPD, they took control of the SigAlert system as well. It is now used throughout California and limited to traffic situations only. Messages are still broadcast, but most radio stations now read the information from the CHP's Web service rather than rebroadcasting the police dispatchers' voices. CalTrans latched on to the term "SigAlert", and it has now come to be commonly defined as any traffic incident that will tie up two or more lanes of a freeway for two or more hours.
As of 2007 not all stations choose to use this term. For example, in Los Angeles, radio station KABC uses the term "KABC Traffic Alert", while radio stations KNX, KFI-AM, KRLA, and KCRW still use the original term.
Read more about this topic: Sig Alert
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