Caltrans made the announcement on Twitter at approximately 9:15 p.m. Sunday and warned drivers to be patient and drive slow.
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The agency had already deployed snow plow crews to the area as a precaution, and those crews were expected to stay there overnight.
By Monday morning, the 5 Freeway remained open and drivers were no longer being escorted, but weather conditions were still rough.
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The snow sometimes fell sideways because of the wind.
Drivers traveling northbound on the freeway were still encourage to take it slow.