MISSISSAUGA, Ont. -- The Ontario government will widen a four-kilometre stretch of Highway 401 in Mississauga to 12 lanes from six.

The Canadian Press has learned Premier Kathleen Wynne is expected to make the announcement later Friday morning.

Wynne says the project will cost $81 million and be completed by 2019 and support 800 construction jobs.

She says the project will span Hurontario Street to Credit River and will have two high-occupancy lanes.

The government says the expansion is one of 230 highway construction projects that are expected to begin this year.