Travel chaos could be on the way for thousands after the Met Office issued another weather warning.
Challenging icy fog is expected in many parts of the UK, with 15 hours of problems predicted.
As well as poor visibility on the roads, they say slower journey times with delays to bus and train services are also likely.
The Met Office meanwhile suggest delays or cancellations to flights could be possible. Their yellow warning has been issues for much of the east coast of England.
It covers from Tyneside down to Suffolk - with much of Yorkshire also told to expect the difficult conditions.
Peterborough, Birmingham and most of the Midlands are also covered by the warning.
Dense fog will not clear for many until late on Friday.
Met Office forecaster Clare Nasir said: “If you are travelling over the next few days, it is worth noting that you could run into some fog which could be stubborn, so causing poor visibility on the roads.
“The air is dank, lots of clouds trapped under this area of high pressure which extends across the country."
The Met Office have meanwhile said things are expected to turn very cold next week in the build up to Christmas.
Temperatures about to tumble as a big freeze is about to sweep in from the Arctic.
Their long-range forecast from December 20 reads: “In general, cloud amounts will tend to reduce with time, with a corresponding increase in the risk of overnight fog and frost, which may be slow to clear by day in some areas.
“Towards the middle of the period, there is an increasing chance of more unsettled and windier weather affecting the UK, with rain, and perhaps snow, possible for some places.
“Temperatures will generally be near to below normal, perhaps rather cold in the south, feeling chilly where any fog persists, and locally mild in the north and northwest.”
