Crews in and around the city continue to work to deal with messy road and sidewalk conditions created by Thursday's snowfall.

As of 8 p.m., Environment Canada said that 17 centimetres of snow had fallen at Toronto Pearson International Airport, with much higher numbers reported in other parts of the city, including Toronto's Riverdale neighbourhood, which has reportedly had 24 centimetres.

A snowfall warning issued by the national weather agency early Thursday morning for Toronto and much of the Greater Toronto Area was ended shortly before 6 p.m.

In the city, Toronto plows were out beginning at around 4 a.m. to start clearing snow from city streets. A second round on main city streets was expected to be completed for around 4 p.m., Manager of Road Operations Hector Moreno said.

Three rounds of plowing have already been completed on the Gardiner Expressway, the Don Valley Parkway, Allen Road and Highway 27, Moreno added.

Plowing on smaller local roads began this afternoon, and is expected to take between 16 and 18 hours to complete.

Moreno said that he anticipates that snowplows and salters will be operating non-stop until sometime Friday evening.

Sidewalks should be cleared for around 7 a.m. Friday, he said.

The messy road conditions are contributing to a higher-than-normal number of collision calls, according to police agencies across the region.

As of 4 p.m., 200 collisions had been reported to Toronto police since 5 a.m.

At one point, police reported responding to about one collision every three minutes in the city.

North of the city, York Regional Police reported 38 collisions today and since midnight, Durham police said officers had responded to 18 collisions.

CAA South Central Ontario said that by 1 p.m. it had received approximately 2,500 calls for service from drivers. They expected the number to double by the end of the day.

As of 4:30 p.m., no fatal collisions had been reported in Toronto or the GTA.

Police continue to remind drivers to slow down and leave more time than usual to get to where you need to go.

School buses in York Region were cancelled for the day, as were buses to schools in Mississauga, Brampton and Caledon.

For a full, updated list of school bus cancellations and school closures click here.

GO Transit said that all GO bus routes experienced delays of up to 45 minutes Thursday morning, while York Region Transit warned riders of major delays system-wide.

The TTC reported some delays on surface routes.

The Greater Toronto Airport Authority is reminding those flying out of Toronto airports to check their flight status. Several delays have been reported for flights heading east.