Ontario Provincial Police were busy with more than 200 calls Sunday as freezing rain made roads treacherous for motorists.

Most of the accidents were caused by people driving too fast for the conditions. Thankfully no one was seriously injured in the crashes.

"As soon as it started the calls started and there were collisions everywhere," said OPP Const. Dave Woodford.

In Burlington, four people were sent to hospital after a crash and in Toronto, two people were treated for injuries after four cars slid into each other near Jane Street and St. Clair Avenue.

Temperatures began to rise over the freezing mark around noon, making road conditions a little less dangerous for motorists, according to Environment Canada.

However, before the ice started to melt, police had to close off a section of Highway 401 for an hour so that they could salt the icy stretch.

Heavy rainfall was reported in Sarnia, London and Kitchener. The OPP warned people to stay off the roads as the freezing rain made for treacherous driving conditions around southwestern Ontario.

About 10 millimetres of rain was expected to fall in Toronto throughout the day and night.

A combination of the rain and warmer temeratures melted a big chunk of the snow mounds left over from a month's worth of snow storms. Police are warning people to keep pets and children away from streams and lakes where water levels are rapidly rising.

The city spent Sunday removing snow to help reduce the risk of flooding. Crews also cleaned out catch basins.

"I've got crews out (with trucks) who are picking up snow complaints and if they see ponds or puddles forming, they will open that up," said Peter Noehammer, Toronto's director of transportation services.

Some parts of the province were also expecting heavy snowfall this weekend.

Regions in eastern Ontario, including the Ottawa Valley north to Algonquin Park, will see the precipitation start out as snow with freezing rain in the evening. The area could see as much as 15 centimetres of snow by Monday morning.

Sections of northern Ontario, including Timmins and Sault Ste. Marie, are expected to receive between 20 and 30 centimetres of snow by Monday morning.

With a report from CTV Toronto's Naomi Parness