An approximately three-hour long SigAlert shut-down the Sierra Highway off ramp and southbound 5 Freeway truck route in Santa Clarita after a semi-truck overturned down an embankment Saturday morning.  Around 7:30 a.m. Saturday, emergency responders received reports of an overturned semi-truck in the northbound truck lane of the Newhall Pass in Santa Clarita, according to the California Highway Patrol (CHP) ...

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