Sig alert, Sig-alert or Sigalert in California, as well as other parts of the United States, means an incident that significantly disrupts road traffic. The term was originally the name of a pioneering system of automated radio broadcasts regarding traffic conditions, introduced in the 1950s and named after its inventor, Loyd Sigmon. The term was added in 1993 to the New Shorter Oxford English Dictionary. In practice, there is no standard spelling; the CHP website uses "SIG Alerts" and "Sigalert" while Caltrans uses "Sig-Alert".
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