Police in Saskatoon say a major highway south of the city has been closed after a traffic accident involving a semi-trailer.

Saskatoon Police Service officers said northbound traffic was closed near Blackstrap Lake on Highway 11 on Tuesday morning.

Police said conditions were extremely icy and drivers needed to take extra care.

Officers advised drivers to slow down and allow extra driving time.

Police also advised drivers allow for extra stopping distance when approaching intersections and other vehicles.