The California Highway Patrol issued a Sig Alert this morning on the 71 Freeway in Chino due to a jackknifed tractor trailer.

The crash was reported at 6:33 a.m. on the northbound 71 at Grand Avenue. A big rig with a box trailer was blocking the carpool and fast lanes.

Officers issued a Sig Alert at 7:18 a.m., saying the carpool lane would be blocked at least an hour.


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