There are warnings of further snowfall in the UK on Friday, as the cold spell continues to cause disruption.
The Met Office has issued an amber warning of snow, meaning be prepared, across much of Scotland, northern and eastern England and the Midlands.
In addition, rain and melting snow are expected to lead to rising water levels in rivers in south-west England.
A father has died after his car and a second vehicle his wife was driving crashed into a river in Derbyshire.
The fire brigade said the weather "certainly contributed" to the accident, which took place as two cars carrying four members of the same family crashed on the A6 near Buxton.
The Environment Agency has two flood warnings and around 30 alerts in place.
A yellow warning for snow, which means be aware, has been issued by the Met Office for Wales, London and the south-east and south-west of England.
It warned that strong winds will also lead to drifting and blizzard-like conditions, particularly over higher level roads in the north.
Forecasters are warning of a weather front which will bring heavy rain in western parts of the UK on Friday morning which, combined with snow melt, could cause flooding.
This weather is expected to fall as snow as it moves into eastern Scotland, northern England and the Midlands, with 5-10cm (2-4in) possible on higher ground.
But it is due to become milder over the weekend, with temperatures set to return to normal levels for the end of January.
"It's all change over the weekend as mild air gushes eastwards, displacing the cold, and we will see significantly higher temperatures. But these weather fronts will also bring rain," BBC forecaster John Hammond said.
In other developments:
The Environment Agency has warned of the risk of minor localised flooding in some areas due to the rapid thaw.
Flood risk manager Phil Rothwell said: "We are closely monitoring the situation and have teams ready to respond to any potential flooding. People should check out if they are in a flood risk area, and sign up to free flood warnings on the Environment Agency website."
The AA said it was gearing up for a busy day on Friday as it had received 9,000 call-outs, including 80 cars stuck in snow by 14:00 GMT on Thursday.
Head of special operations Darron Burness said: "It's difficult for forecasters to know the extent of the snowfall, so check the local weather and traffic reports before heading out and be prepared for possible disruption. Take extra care, particularly on higher ground, and allow extra time for your journey."
Steve Crosthwaite, head of the Highways Agency's national traffic operations centre, said: "We have been working hard to keep motorways and major A-roads running throughout winter, and particularly over the last couple of weeks. With another flurry of snow expected, we ask people to remain alert and continue to take care when travelling.
"As always, we ask people to give our winter fleet the space they need to do their job and, during periods of particularly severe weather, to consider delaying their journeys until conditions improve."