The Thunder Bay Expressway was down to two lanes Tuesday morning between Oliver Road and John Street, after a collision involving three vehicles.
Ontario Provincial Police reported only minor injuries, after a southbound SUV lost control and drove into the northbound lane, colliding with another SUV. One of the vehicles was then struck by a tractor-trailer. The two people injured included a 2-year-old child and a 54-year-old woman.
"Early mornings, sometimes the highways appear to be dry and bare," said Thunder Bay OPP spokesperson Diana Cole.
"But with the frost that we've been having, moisture in the air, the cold temperatures, and the wind-chill factor, the roads actually are quite icy."
In addition to the three-vehicle accident, Cole said several other vehicles drove off the road during the morning rush hour.
She said OPP are asking drivers to "take it easy, slow down. Give yourself some more time to reach your destination in the morning."
The expressway is now open in both directions.