Five people have died on treacherous roads in three days after sub-zero Britain was enveloped in freezing fog.
Visibility fell below 300ft in England today with temperatures dropping under -7C for the second night in a row.
The latest victim was a 66-year-old driver whose car came off an icy road in Lechlade, Gloucestershire, at 11am.
It follows separate road deaths in Oxfordshire and Hampshire yesterday, and two more in Suffolk on Tuesday.
Motorists were warned icy roads could become ‘lethal’ and the AA urged ‘extreme caution’ when driving today.
And airports battled with fog as dozens of flights were cancelled or delayed at London City, Luton and Heathrow.
Taking precautions: A cyclist makes his way through Richmond Park in South West London on a cold and frosty morning
Walking the dog: A woman walks her dog on Blackheath in South East London today after a sub-zero night of freezing fog
Wintry stroll: People go out walking their dogs on a frosty morning in the Berkshire countryside today
Icy landscape: The frost covered Oxfordshire countryside near Dunsden Green today on a sunny winter’s morning
Frozen pitch: The light catches a stormy looking cloud as the sun rises near Bournemouth in Dorset this morning
Shrouded in mist: A foggy morning embraces Richmond Park in South West London on a frosty day
A huge 30-car pile up yesterday on the fog-hit A40 in Oxfordshire killed a driver in her 50s from Gloucestershire.
And there was another crash in a similar section of the A40 near Witney today involving two cars at about 7.30am.
Also yesterday at 4.30am, a 60-year-old man died after his van hit a tree on the A434 in Highclere, Hampshire.
Two women were also killed in separate crashes in Suffolk on Tuesday when there was also fog and frost in areas.
A woman in her 20s died after her car was involved in a collision and ended up in a ditch at 8.30am in Thorndon.
Then less than two hours later a woman pedestrian in her 40s died after being hit by a car in Great Bradley.
Travellers across England should expect difficult driving conditions, longer trips and possible flight delays today.
Motorists were warned by the AA that roads could become ‘lethal’ due to poor visibility and the onset of ice.
Dangerous idea: Warwickshire Police ticketed a motorist for having only a partially-cleared icy windscreen this morning
Interior view: Officers said the driver had been ticketed, adding: ‘Be sensible and clear your windscreens before you drive’
A foggy morning embraces Richmond Park in South West London after temperatures fell to -8C in Britain overnight
Frost: A jogger runs through Richmond Park in South West London today as Britain again woke up to sub-zero temperatures
Christmassy scene: It was a frosty morning in London today following overnight sub-zero temperatures in Britain
Ponies grazing on a cold and frosty morning at Roydon Common National Nature Reserve near King’s Lynn in Norfolk today
This morning drivers on the M6 faced long queues near Warrington in Cheshire following a multiple-car pile up.
And one of Britain’s busiest roads was closed in both directions after a truck laden with straw burst into flames.
Fire services were called to the blaze on the A1, south of Scotch Corner in North Yorkshire, at about 7.45am.
Fire ravaged the truck’s main cabin, but North Yorkshire Fire and Rescue Service said there had been no injuries.
A spokesman said firefighters stopped the blaze before it took all the straw, but it ‘did cause a lot of havoc’.
The worst of today’s fog is ‘most likely in a zone from the West Country to eastern England’, the Met Office said.
The AA urged ‘extreme caution’ for those heading out on the roads, adding that extra time should be allowed.
It also told motorists to ensure their tyres were properly inflated and their screens were adequately de-iced.
Trees cast long shadows through the mist and fog as it hangs in valleys on the Mendip Hills in Somerset at sunrise today
Hard to see: A woman walks through fog as the sun rises over Clapham Common in South London this morning
A woman takes a photograph on a foggy Clapham Common in South London this morning on another very chilly day
The sun rises over a frosty Coventry today as Public Health England issued advice for the over 65s during the cold weather
Coventry sunrise: The worst of today’s fog will be ‘in a zone from the West Country to eastern England’, the Met Office said
A man walks over a bridge on a cold and frosty morning in Westminster, with Shell Mex House visible in the background
St James’s Park is pictured on a chilly morning in Central London today as temperatures fell below zero in parts of Britain
A spokesman said: ‘We have got the worst possible conditions really, of fog and icy roads, and that can be lethal.
‘I think the message is extreme caution and to prepare for the worst and make sure all windows are clear.’
The warning came as Warwickshire Police tweeted a picture of a motorist’s partially-cleared icy windscreen.
Officers said the driver had been ticketed, adding: ‘Be sensible and clear your windscreens before you drive.’
It came after the Met Office issued a level three cold weather alert, warning the elderly to stay warm indoors.
London City Airport was again suffering from delays due to fog today, with 90 per cent of its flights running late.
Further delays are expected this afternoon with the average delay time at City currently standing at 50 minutes.
Swans on the River Severn by Worcester Cathedral after a night of freezing fog and sub-zero temperatures across England
Chilly ground: Horses feed in a frosty field on a cold but sunny morning in Berkshire today
Going for a stroll: People walk their dogs on a cold and frosty morning in the Berkshire countryside today
Chilly on Blackheath: The Met Office has issued a level three cold weather alert, warning the elderly to stay warm indoors
Cycling on Blackheath: Travellers across England should expect difficult driving conditions, longer trips and flight delays
Freezing fog: A pedestrian is shrouded in mist as they walk across a frosty Blackheath in South East London this morning
City, the world’s fourth most delayed airport at lunchtime, told passengers to check their flight with their airlines.
It comes as dozens more flights were delayed or cancelled due to poor visibility at the airport yesterday morning.
Heathrow was also hit by delays, while Luton faced disruption after a technical issue with its air traffic control.
Meanwhile last night was the winter’s coldest night so far across Wales with a low of -7.7C at Llysdinam in Powys.
Yesterday’s minimum temperature was -7.2C in North Yorkshire, while Santon Downham in Suffolk fell to -5.9C.
Tuesday night was the coldest night in England and Wales since December 2, when -7C was recorded in Wiltshire.
Public Health England issued advice for the over 65s and those with long-term illnesses or who are not mobile.
Spectacular: Beautiful colours as the sun rises at Mupe Bay today, on the Dorset coast between Weymouth and Swanage
Across the Thames: People walk over Millennium Bridge towards St Paul’s Cathedral during sunrise in London this morning
The Shard building is silhouetted during sunrise in Central London today, with Tower Bridge visible on the far left
The sun rises behind Tower Bridge as a jogger runs alongside the River Thames on a cold winter’s morning in London today
Freezing: The sun rises over London and the River Thames after another chilly night that saw temperatures drop to -7C
Glorious start: Bristol is pictured this morning during frosty conditions as the UK continues to experience cold weather
It said they should have plenty of warm food and drinks and try to maintain indoor temperatures to at least 18C.
PHE also stressed that people should check on potentially vulnerable family and friends during the cold period.
The high pressure which has brought the fog and frost will remain in control today with settled conditions.
And while the cold will continue into the weekend, there will be a cloudy and wet start to the New Year.
The rain will be in the North on New Year’s Eve, while it will be dry and cloudy in the South for the celebrations.
Showers will move down Britain on New Year’s Day, but then clear before a return of sunny days and frosty nights.
Forecasters say today’s average daytime temperature will struggle to breach 7C, but could hit 12C by Saturday.
Keep temperatures to 18C and drink plenty of warm drinks: How the elderly can get through the cold snap
A level three severe weather alert has been issued by the Met Office warning of plummeting temperatures in England.
Public Health England has also issued advice for the over 65s, those with long-term illness or who are not mobile.
Dr Thomas Waite, consultant in extreme events and health protection at PHE, said: ‘The effects of cold can be severe, in particular for those who are over 65, have a long-term illness, or are not mobile.
‘Our advice to these groups is when indoors, have plenty of warm food and drinks and try to maintain indoor temperatures to at least 18C. If mobility isn’t an issue, keep active as best you can.
‘If you need to go out wear lots of thin layers and shoes with a good, slip-resistant grip to prevent any accidental falls.
‘It is particularly cold at night this week, so drawing the curtains at dusk will keep the heat in.’
He also stressed the importance of checking on potentially vulnerable family and friends during the cold period.