The structure is a brand name turned generic noun, combining "Sig" (short for "signal" or from founder Loyd Sigmon) with "Alert" (warning). It is used in California, especially Southern California, to describe a traffic alert or warning, typically issued for accidents, major congestion, or roadway hazards on freeways. People typically say "There's a SigAlert on the 405" or "SigAlert issued for the 10 freeway."

Definición y significado de "SigAlert"en inglés

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