Travellers are being warned of delays as a yellow weather warning for fog remains in force until 11am on Monday.
The warning covers an area that stretches from York to Bath and takes in most of the South East and eastern England.
Visibility could fall to 50 metres or less in some places.
Bus and train services could be delayed, and there is a chance of flights being cancelled.
Niamh Murray, Met Office operational meteorologist, said current weather conditions are the “perfect recipe” for fog.
“With autumn and winter and getting fog during this time of year, we get much longer nights, and that allows temperatures to fall away,” she said.
“We get a longer period of cooling and also the temperatures are much lower, so they’re much closer to the temperature that we need for the air to become saturated and therefore form fog.
“Another thing that we need to form fog is quite light winds, not absolutely no winds.
“We just have the perfect recipe at the moment: light winds, clear skies, long nights, to allow that fog to develop. And particularly if we see the negative numbers (temperature in degrees Celsius), it can quite stubborn to clear the next day.”
Motorists have been urged to take extra care in the low-lying cloud.
The advice follows a crash involving more than 30 vehicles during foggy conditions, which led to a motorway being closed for nearly 12 hours.
The pile-up happened on the M20 in Kent on Saturday evening, leaving two people seriously injured.
The road was shut in both directions between junction 8 and 9 near Maidstone.
AA president Edmund King previously said: “Fog can transform a familiar road in a matter of minutes, so drivers need to be prepared to adapt their speed and leave more room between themselves and the vehicle ahead.
“One of the biggest mistakes is simply following the rear lights of the car in front. It can give you a false sense of security and means you may be travelling too close to react safely if that vehicle suddenly stops.
“Ultimately, there’s no prize for arriving a few minutes early. Give yourself extra time, slow down and drive to what you can actually see ahead.”
Read MoreRemembering Kristallnacht: Witness says night of terror risks being a lesson not learned
Met Office warns UK to brace for travel disruption amid 'perfect recipe' for fog
Russell Brand’s courtroom downfall: From flamboyant showman to convicted rapist
