One person was killed Friday in a single-vehicle crash on the southbound Costa Mesa (55) Freeway at MacArthur Boulevard in Irvine.
California Highway Patrol officers were called to the scene at about 1:20 a.m and discovered a vehicle crashed into the guard rail, according to a CHP dispatcher.
One person was killed, but it was unclear if the victim was a man or woman, the dispatcher said.
A SigAlert was issued for an unknown duration for the car pool lane on the southbound Costa Mesa (55) Freeway at the northbound San Diego (405) Freeway offramp.
The cause of the crash is under investigation.
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