TORONTO - Icy roads made driving treacherous Friday morning on Highway 400 south of Barrie.

Freezing drizzle left a thin glaze of ice on the highway, which resulted in several vehicles spinning off the road and into each other.

A stretch of Highway 400 from Highway 89 to Innisfil Beach Road was closed for about five hours.

There were four crash scenes along that stretch of roadway with one involving four vehicles. One vehicle flipped onto its roof, sending a woman to hospital with life-threatening injuries.

Meanwhile, much of the Greater Toronto Area is expected to get an early taste of winter driving as periods of light snow move in Friday night.

The forecast calls for one to two centimetres of snow for Toronto and most of the surrounding region but areas near Oakville, Burlington and Hamilton could get two to five centimetres or more due to lake enhancement.