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Serious collisions closed down sections of highways in eastern Ontario on Monday, as freezing rain made driving treacherous in some parts of the province.

Both Highway 401 westbound and Highway 7 were closed in sections at times, leaving frustrated commuters stuck in back-to-back traffic with delayed or cancelled plans between Ottawa and Toronto.

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Highway 401 westbound at Brighton was closed for hours due to numerous collisions, including a tractor trailer that dumped diesel fuel, but reopened shortly before 7 p.m.

Highway 7, which had been closed since mid-afternoon between Highway 37 and Highway 41, also reopened to traffic shortly after 9 pm.