"Several trucks have been at a standstill. You can hardly count them anymore," Jimmy Halvarsson, a traffic reporter at Swedish Radio, said Friday. He said both small and big roads, like the E4 highway, had been affected.
There were several accidents in the Stockholm area Friday, causing massive pileups.
The SMHI weather service issued a class 1 warning for the Roslagen coastline, warning that between one and two decimetres of snow would fall there before Saturday morning, though most of the snow had already come down on Friday.
"On Saturday, the weather will be considerably calmer with light snowfall across the country," said Lisa Frost, a meteorologist at SMHI.
Still, drivers were cautioned to keep long distances between cars on the roads.
Saturday's temperatures should range from freezing in the south to minus 30 degrees Celsius in the northern mountain region.