Police are warning drivers of hazardous conditions on roads after snow fell in parts of the UK overnight.
The M1 was blocked at junction 19 after a lorry accident, while police said there had been “multiple collisions” on the A14 in Northamptonshire.
The Met Office has issued warnings for ice for northern Scotland, Northern Ireland and north-east England and snow for Wales and parts of England.
Meanwhile, about 14,000 properties around the UK are without power.
Western Power Distribution said 13,000 homes are without power in the East Midlands and West Midlands, with homes in Worcester, Gloucester and Coventry affected.
The firm said the cuts were all snow-related and extra staff – who had been on standby for poor weather – had been called in to work to reconnect properties.
More than 7,000 homes are also without power in the West of England, including 3,400 homes in Wiltshire and more than 3,600 in the Gloucestershire area.
Frank Bird, from Highways England, said the worst of the conditions were now over in the West Midlands, as the bad weather moved eastwards.
He said 2,000 tonnes of salt and grit had been put down in the region overnight, adding that treating roads was a “battle that we are constantly fighting”.
One of those caught up in the problems on the A14 was lorry driver Simon Talbot, who told BBC News he had been stuck for three hours.
“I’ve been stationary since about 02:20 GMT westbound on the A14, there is approximately 5ins (12cm) of snow we’ve had and I’m just stationary.”
He added: “I’m on an incline and there are lorries and vans in front that are unable to get up the hill because of the snow. So it is just a waiting game at the moment.”
Referring to the incident on the M1, Leicestershire Police tweeted: “There has been an accident involving a lorry.
“Unfortunately, all lanes are currently blocked. Police and Highways are aware and are currently dealing. Please make alternative travel arrangements.”
It added: “Please be aware that snow is falling across the county and in some cases it is settling, causing hazardous conditions for drivers. Please take care and take the necessary precautions.”
Officers said there are “long delays” on the A34 between the M4 and A4185 in Berkshire due to the weather conditions and slow moving traffic.
Northamptonshire Roads and Armed Policing Team (RAPT) tweeted: “Heavy snow has started. The M1 has quickly become treacherous. RAPT on scene at a single vehicle RTC (road traffic collision).”
Three lanes of the M25 have also been closed near Heathrow following an accident.
Air travellers have been warned that there may be disruptions at some airports. Birmingham Airport closed for a short time late on Tuesday to allow for slush and snow to be cleared from the runway.
Luton Airport, where snow is falling, advised passengers to check with their airline for the status of their flight.
The Environment Agency currently has about 15 flood warnings in place – meaning flooding is expected – and more than 100 flood alerts.
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