The return of the cold weather previously experienced across the country in the run up to Christmas has caused dangerous driving conditions in some parts.
Three men were killed in a car crash on the M62 near Huddersfield in West Yorkshire, as snow once again covered northern England, as well as Wales and Scotland.
They were pronounced dead at the scene after their Mitsubishi saloon car left the carriageway and collided with a barrier, police said.
They have been named as Bilal Bholat, 24, Imran Bodi, 27, and Alnoor Rajani, 31, all from the Preston area.
Other roads have been blocked by accidents caused by the bad weather. Parts of the A14 in Suffolk, the A5 in Shropshire and the A628 in Greater Manchester have been closed following accidents.
Elsewhere, a tree fell on an empty car near Blaenavon, south Wales, blocking the Blaenavon-Cwmavon road.
Forecasters have predicated that temperatures could fall below freezing again in many areas.
The bad weather has also caused the death of three climbers, who were caught in two mountain avalanches.
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