Drivers are being warned to be on their guard as widespread freezing fog and icy conditions descend on the UK.
Large parts of the country are expected to experience adverse weather after one of the coldest nights of the year so far.
Julian Mayes, forecaster for MeteoGroup, said central England, as well as Wales and East Anglia, had been hit by fog, which is likely to spread through the night.
Mr Mayes said in the worst affected areas there will be less than 100 metres visibility.
Tomorrow when the fog lifts the weather is going to become a little more unsettled for the second half of this week with rain.
Probably no significant snow but it will end up wet and windy by Friday, so a big change is coming.
Clear skies and light winds are a recipe for fog to develop, so allow extra time to defrost your car and check before you travel.
It's another bitterly cold day today. It's all down to where the air originates from - and today's can be traced back to Russia.