Travellers in some parts of Britain are being advised to re-route or postpone their journeys as the UK braces itself for more freezing weather and snow.
Temperatures are due to rise over the weekend
Snow fell in the west on Thursday but the most severe weather will affect eastern England and Scotland later.
The Highways Agency urged drivers to check forecasts before setting out, amid predictions of driving winds.
Forecasters say the worst of the current cold snap will have passed by the end of the day.
Rain is forecast in most western parts of the country, where temperatures are higher.
The north-east of England is expected to have some of the most persistent snow.
The Royal Society for the Prevention of Accidents has warned people to stay off frozen waterways and to keep dogs on leads.
The dangers of playing on icy lakes and ponds was highlighted by police in Scotland, who ordered around 10 youngsters from a frozen boating pond in Dingwall, near Inverness.
A force spokesman said: "It cannot be stressed strongly enough the dangers of persons walking or playing on ice over an area of open water.
"We would encourage the assistance of parents to advise their children accordingly."
Roger Vincent, of the Royal Society for the Prevention of Accidents, said at least 20 people had died over the last decade after falling through ice over open water.
"With that figure in mind, it's madness to even test the thickness of ice with your toes," he said.
Temperatures in many parts of the country, including Nottingham, York and County Durham, remained below zero on Thursday.
Train services have been largely unaffected by the weather
In the West Midlands a man in his 40s is thought to have frozen to death.
Police said he was found by a passer-by in the doorway of West Bromwich Town Hall on Wednesday.
East Anglia, eastern Kent and East Sussex have so far seen the worst conditions, with heavy snowfalls leaving some roads impassable and causing delays to train services.
And with more ice and snow forecast, South Eastern Trains warned there might be further disruption to its services.
GNER and Virgin train services through Berwick-upon-Tweed in Northumberland were affected by power supply problems on Thursday.
But services remained largely unaffected by the weather on Thursday, said Network Rail.
Meanwhile 75 complaints have been made in south-east Kent about snowballs hitting people, cars and houses - almost a fifth of all calls received during Wednesday night, said police.