Police have warned of “hazardous” conditions for travel as falling temperatures overnight may have left widespread icy patches.
It follows the Met Office issuing a yellow weather warning for overnight snow and ice across most of mainland Scotland. This has now expired.
Forecasters said further wintry showers were expected, with snowfall on higher ground, leading to icy surfaces.
Police Scotland urged people to take “extra caution”.
Drivers across Scotland already faced hazardous conditions when much of the country was blanketed by snow and ice on Thursday.
The Met Office said the unsettled weather would stay around over the next four or five days, although conditions were not expected to be as severe as during the past week.
Thursday’s snow saw a total of 29 high schools, primaries and nurseries in the Highlands and 10 schools in Perth and Kinross close.
Several schools in South Lanarkshire also delayed opening.
On the roads, Traffic Scotland said snowy conditions affected much of the central belt, the A9 around Slochd and the A90 around Dundee.
A number of rail and ferry services were also impacted by heavy snow.
Meanwhile, a house in Ardroil, Uig on the Isle of Lewis, was struck by lightning and caught fire during the adverse weather.
The Met Office said there was a small chance that snow showers could be accompanied by frequent lightning, which could impact power supplies.
This could affect some places outside of the yellow warning area.