As more snow fell in southwestern Ontario, Environment Canada issued a special weather statement for the region.
Forecasters say a fast-moving disturbance from west of the Great Lakes is tracking across the area and will move into northeastern Ontario by Wednesday night.
Around five centimetres of snow is expected in most of southern Ontario, though communities near the lakes could get more.
By early Wednesday evening OPP were reporting crashes and closures across the region on highways and county roads, with icy and windy conditions making driving difficult.
Many London drivers took to Twitter with the #LdnOnt hashtag to share stories of very long and frustrating drives, and to remind other motorists to slow down and be careful.
Meanwhile a blowing snow advisory is in effect for Huron, Perth, Grey, Bruce and Wellington County. A snow squall watch has also been issued for the Bruce Peninsula.
Environment Canada says flurries combined with brisk westerly winds are likely to produce frequent low visibilities east of Lake Huron beginning Wednesday evening, and continuing through Thursday.
Travel could be hazardous due to sudden reduced visibility in some locations.
