Traffic is being diverted around the intersection of Highway 1 and Highway 39 about four kilometres east of Moose Jaw.
A semi rolled at the intersection early Thursday morning before 7:30 a.m.
Moose Jaw RCMP are on the scene diverting traffic into the eastbound lane. The westbound lane of Highway 1 will be closed until approximately 1 p.m.
Drivers are reminded to slow to 60 km/hr when passing emergency vehicles.