Rush hour commuters could face hazardous driving conditions and delays as a fresh band of thick fog blankets the UK.
The Met Office issued its second consecutive severe weather warning for fog, after the misty visibility-reducing conditions blighted the south of the country overnight on Saturday.
Greg Dewhurst, a Met Office meteorologist, said the new severe weather warning they have issued covers southern parts of England and Wales and is valid until 10am on Monday.
"For the morning there could be some tricky driving conditions, the fog will be in and out - you could be fine driving along and the next minute come across this thick fog," he said.
"It is worth drivers being aware first thing in the morning," he said, adding that "some dense patches are definitely possible".
Over the weekend Gatwick and Heathrow airports warned their passengers they could face delays and cancellations because of the "foggy conditions".
And as the next batch of fog rolled across the South West, southern Wales, the Midlands and parts of the South East, Mr Dewhurst said visibility in Bournemouth was around 200 metres and 400 metres in Exeter.
The Met Office warning advised people to "be aware of potential delays and hazardous driving conditions".
Mr Dewhurst said that in terms of temperatures on Monday morning "it could be on the cold side" and a "little bit frosty in one or two places".
"But that is more likely in countryside, towns and cities will be holding up around four or five degrees - which is about average," he added.
"It will be quite a dull start to the day elsewhere as well - with generally cloudy conditions and some light patchy rain."