Motorists are being told to expect icy conditions and allow more time for journeys in large parts of the UK, with temperatures due to drop overnight.
A Met Office yellow warning for ice is in place from 18:00 GMT on Wednesday until 11:00 GMT on Thursday.
The warning covers much of Scotland and northern and eastern England.
The Met Office said temperatures could drop as low as -7C overnight, with wintry showers and sleet expected and the possibility of snow in some areas.
It said temperatures of below freezing were expected in most areas, excluding Wales and south-west England, and clear skies would cause wet surfaces to “freeze quite readily”.
There is also a chance of snow, mainly in areas above 200m.
Met Office meteorologist Martin Bowles said those travelling on Thursday morning should allow more time for journeys and take extra 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 problems for the morning commuter period.
Icy conditions caused travel disruption to some parts of the country earlier on Wednesday.
The worst-affected area was north-west England, where flights and rail services were hit by delays and cancellations.
The runway at Liverpool Airport was temporarily closed due to icy conditions while passengers using Manchester Airport also faced delays because of thick freezing fog.
Merseyrail said there was severe disruption to its services caused by ice preventing electricity from reaching the trains. It said services had now returned to normal, with the exception of replacement buses operating between Hooton and Ellesmere Port.
Icy conditions also caused a number of incidents on motorways in north-west England, with the M61, M53 and M6 all affected.
Dyfed Powys Police said it had received “several reports” of crashes due to ice while North Wales Police said snow was causing “treacherous” conditions.
There was a serious crash in Neath Port Talbot and a 10-car crash in Swansea on Wednesday morning.
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