A Sig Alert is defined by the California Highway Patrol (CHP) as "any unplanned event that causes the closing of one lane of traffic for 30 minutes or more." Sig Alerts are issued by the CHP and are posted on their website, broadcast on radio and television stations throughout California, and signalled to motorists via electronic message signs on the freeways. The term was added in 1993 to the New Shorter Oxford English Dictionary. (In practice, there is no standard spelling; the CHP Web site uses "SIG Alert," "SigAlert," and "Sigalert," all on the same page.)
Read more about Sig Alert: The Origin of The Sigmon Traffic Alerts, The Early Use of The Sigalert, The CHP Era and Current Usage
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