The snow has covered most of the east of England
Heavy snow has caused travel disruption across Cambridgeshire and weather experts say worse is to come.
Four inches (10cm) of snow fell overnight and although no roads are closed ice is creating treacherous driving conditions.
Up to 120 schools are closes and it is expected that this number will increase.
Widespread power cuts have been reported in villages and rural parts of the Swavesey area of the county.
Hundreds of people are still without electricity and EDF Energy have given no indication when it will be restored, but engineers are carrying out reconnection work.
Police said accidents are blocking some minor routes and they are advising drivers to prepare for worsening conditions.
The A505 road is blocked between Royston and Baldock, and there are delays because of minor accidents and slow traffic on the A1307 at Linton.
Disruption is affecting rail services with First Capital Connect and National Express East Anglia reporting cancellations. Trains are also travelling at reduced speed.
The RAC and safety organisations have urged drivers to prepare for worsening conditions, making sure they have the likes of warm clothing and food in their vehicles.
'Use good sense'
They said drivers on the A14 - which is currently clear - are at risk and if they break down they are advised to get out of the car, keep warm and call for help.
David Donegan, of East of England Ambulance Service, said: "We are responding to calls for emergency assistance and will be deploying 4x4 vehicles to help us reach more isolated locations.
"However, we are relying on the public's good sense to use the 999 service wisely to help us respond to people who need our assistance for true emergencies."