Motorists are being told to expect icy positions and allow more era for travels in large parts of the UK, with temperatures due to drop overnight.
A Met Office yellow threatening for ice is in place from 18:00 GMT on Wednesday until 11:00 GMT on Thursday.
The warning deals much of Scotland and northern and eastern England.
The Met Office said temperatures could put as low-spirited as -7C overnight, with chilly showers and sleet expected and the possibility of snow in some areas.
It said temperatures of below freezing were expected in most places, eliminating Wales and south-west England, and clearly defined skies would make soggy skin-deeps to “freeze quite readily”.
There is also a chance of snow, mainly in areas above 200 m.
Met Office meteorologist Martin Bowles said those travelling on Thursday morning should allow more season for journeys and take additional care on untreated roads and pavements.
BBC weather presenter Ben Rich said that overnight wintry showers would move from Scotland across northern England, which could bring more snow in places, causing questions for the morning commuter period.