Road transport services are likely to face further disruption, as weather forecasters warn of more snow and ice across the country.
According to MeteoGroup, the weather division of the Press Association, freezing conditions could continue to cause travel chaos as people begin to resume work after the Christmas holiday.
Roads may be icy in several parts of the UK including Scotland, North East England, the Yorkshire and Humber region and eastern parts of Northern Ireland.
Mid Wales is expected to witness the worst of the snow, with freezing conditions continuing in the Midlands, Greater Manchester and South Yorkshire.
Predicting there could be as much as 30cm of snow, forecaster Tom Tobler said: "There could be several centimetres in places, enough to cause some problems."
However, emergency plans have been kept ready by the Welsh Assembly Government to keep main roads open during the extreme weather.
Meanwhile, areas such as Grampian, Orkney and Shetland, Highlands and Eilean Siar also could suffer severe weather, as temperatures are expected to fall as low as minus 15C in parts of Scotland and minus 8C in the north of England.
The south of England is expected to face heavy rainfall.
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