Motorists have been warned of dangerous conditions and air travellers of potential disruption to flights after snow and ice struck parts of Britain.
Thousands of people were also left without power overnight, and the Met Office has warned of the risk of slips and falls on icy surfaces.
The southbound carriageway on the M1 was closed after a lorry crashed near Lutterworth, while another jack-knifed on the M5 near Gloucestershire in heavy snow.
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Birmingham Airport warned passengers flights could be affected by snow.
The Met Office has issued a yellow warning for ice across Northern Ireland, large parts of Scotland and the north-east coast of England.
A yellow warning over snow and rain was also triggered for the Midlands, London and the South East, the North West, South West and Yorkshire and the Humber. It will remain in place until 11am on Wednesday.
