Ontario Provincial Police are on scene of a multi-vehicle pileup between Treton and Brighton.
The westbound lanes of Highway 401 are closed at County Rd. 40.
A tractor trailer reportedly jack-knifed and crashed into other vehicles.
One person has been airlifted to hospital.
Visibility has been poor in the area because of blowing snow.
UPDATE: #Hwy401 WB at County Rd 40 #Brighton #Trenton - All WB lanes remain closed at County Rd 40. ^kw
— OPPCommunicationsCR (@OPP_COMM_CR) February 13, 2019