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Police say Highway 400 has fully reopened south of Barrie after multiple collisions on Thursday, including a 20-car pileup.

OPP Sgt. Kerry Schmidt said “multiple crashes” occurred all around the same time between Highway 88 and Innisfil Beach Road leading to a full closure.

“We had northbound and southbound lanes closed due to multiple collisions, a 20-car pileup … single-vehicle collisions, transport trucks involved,” he said.

Approximately 50 vehicles and six trucks were in crashes.

No injuries have been reported.

Schmidt said snow was falling in the area at the time of the crashes, but conditions have since improved.

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“This system came through, obviously made driving treacherous. Visibility was reduced and the roads were very slippery,” he said, adding that motorists need to slow down when severe weather hits.

1:34 Highway 400 south of Barrie reopens after multiple crashes Highway 400 south of Barrie reopens after multiple crashes

The highway fully reopened around 3:30 p.m. after being closed for approximately two-and-a-half hours.

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#Hwy400 reopened between Hwy88 and IBR after approx 50 vehicles and about 6 transport trucks involved in collisions. Fortunately no reports of injuries #SeeSnowGoSlow pic.twitter.com/8FbRSefCFL — Sgt Kerry Schmidt (@OPP_HSD) December 19, 2019