Ambulance bosses say motorists are risking their lives by ignoring advice not to drive in the extreme weather.
Martyn Callow of South West Ambulance Service says crews are having to make needless and sometimes dangerous journeys because of drivers' stupidity.
He says that with overnight ice forecast, people should take extra care:
Has the snow forced your school to close? Find the latest information for your area here.
Devon has been hit by heavy snow and blizzards this morning. Neighbouring Cornwall has missed the snow but there are reports of flooding.
The Met Office have predicted heavy snow in some areas from early in the morning continuing throughout the day and into the night.