Most of the accidents have taken place on National Road Four (Lahdenväylä) around the area of the Ring III highway, the agency said.
The Transport Agency's traffic duty officer Jarmo Eloranta said that the worst incident so far occurred on the Ring III highway in Vantaa on Tuesday afternoon, when three separate collisions shut down the motorway entirely. The cars have since been cleared, and traffic is reportedly running smoothly at that location again.
Other accidents were also reported on smaller roads in the cities of Vantaa, Espoo and Järvenpää, Eloranta said.
Since about 3 p.m., traffic appeared to be running a bit more calmly after rush hour, he said.
Eloranta said that the snow and very slippery road conditions have made driving on hills challenging and advised drivers to use caution.
According to the Finnish Meteorological Institute, driving conditions will be extremely poor in the area on Wednesday as well.
The snow is expected to stop on Tuesday night, but snowdrifts and icy roads will still pose dangers on the roads on Wednesday.