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What is a SigAlert? SigAlert this, SigAlert that ... SigAlert in progress SigAlert canceled ... too many SigAlerts
2011-02-01 14:56:09

	From the CHP (California Highway Patrol) official site:
The official Highway Patrol definition of a Sigalert is any unplanned event that causes the closing of one lane of traffic for 30 minutes or more, as opposed to a planned event like road construction, which is planned separately.

It is also a Commonly Used Abbreviation by the California Highway Patrol:
SIG ALERT = SPECIAL WARNING FOR TRAFFIC TIE UP OF 30+ MINUTES
SIGLRT = SIG ALERT

Where did the name come from ... not from Signal Alerts .. Official DMV FAQ page has it as :
"Sig-Alerts" are unique to Southern California. They came about in the 1940s when the L.A.P.D. got in the habit of alerting a local radio reporter, Loyd Sigmon, of bad car wrecks on city streets. These notifications became known as "Sig-Alerts." Later Mr. Sigmon developed an electronic device that authorities could use to alert the media of disasters. Caltrans latched on to the term "Sig-Alert" and it has come to be known as any traffic incident that will tie up two or more lanes of a freeway for two or more hours. 

And here is a list of current SigAlerts

This is the CHP Traffic Incident Information Page with all kinds of accidents listed. 

more info here than needed 



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