Snowfall overnight is making for a messy Monday commute in Toronto.

College and Spadina slush

Slush filled the roads early this morning, at College Street and Spadina Avenue.

The weather is causing reduced visibility and slippery roads across the GTA, where drivers are being urged to go slow and drive with extra caution.

Toronto Police says it's being called to attend accident once every 4.5 minutes this morning — and that does not include accidents that do not require police assistance.

CAA reports receiving approximately 2,000 calls for roadside service this morning in southern Ontario.

Bus cancellations 

Buses were cancelled in Caledon because of inclement weather, according to the Peel District School Board.

Buses were also been cancelled north of Highway 7 for both public and Catholic schools in the Durham Region

The windy, snowy weather is due to an Alberta clipper, or a fast-moving low pressure area, that is affecting southern Ontario.

The flurries are expected to end sometime in the morning, giving way to a mix of sun and cloud, according to Environment Canada.

Temperatures are expected to drop to - 14 C in the afternoon in what will be yet another extremely cold day.

Travel woes

Air Canada is warning of disruptions and possible delays due to strong winds today and Porter Airlines has advised all passengers to confirm their flight status before arriving at Billy Bishop Airport as delays and cancellations could occur.

The cold and snowy weather has been causing problems on roads across Ontario this weekend.

Snow late Sunday and overnight Monday caused reduced visibility, with multiple crashes on many roads.

Highway 404 express was closed after a collision involving a tractor-trailer and an SUV. A large overhead sign was struck and fell onto the highway.