Police report HWY 400 SB at south Gibson Lake Road in Georgian Bay now has one OPEN lane. traffic remains slow there. In the meantme, traffic remains slow at another section of the HWY 400 SB near Crooked Bay Road and Muskoka Road in Gravenhurst. A tractor trailer is in the ditch there and its blocking the SB lanes. Police ask that you take an alternate route for the time being.