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The Ministry of Transportation says multiple westbound lanes of Highway 401 are blocked through Woodstock this afternoon.
A collision happened near the Woodstock ONroute, prompting the lane closures.
There's no word on when those lanes will reopen, so expect heavy delays in the meantime and plan an alternate.
Through Milton near James Snow Parkway, MTO reports three left lanes are closed as well due to a crash.
Expect heavy traffic in both areas today.
