The Met Office has issued this weather warning today for Saturday 21 January.
The warning is in place from 2 am until 11 am on 21 January.
The warning states:
Freezing fog is expected to develop during Friday night and will be slow to clear in places through Saturday morning.
Some fog could be quite dense with the visibility falling below 100 metres at times.
Additionally, freezing fog may lead to some untreated surfaces becoming slippery.
Western England is more likely to see freezing fog persist into late morning and in a few places into the afternoon.