Hazardous driving conditions across South Yorkshire
Motorists have been warned to take care in icy conditions on roads across South Yorkshire.
Roads across the country are likely to be hazardous, forecasters said.
The Met Office predicted between 2-5cm of snow across the county overnight into Friday morning, with as much as 10cm in isolated areas.
Councils said they were gritting roads as usual but urged motorists to take extra care.
Barnsley Council said cold temperatures meant rain or sleet could freeze instantly on roads and footpaths.
A council spokesman said: "[We ask] that road users and pedestrians alike take extra care.
"The council will be out gritting as usual, but if this freezing occurs, wide areas of the borough will be affected beyond the normal gritting routes, meaning extra care will be needed."
The Northern General Hospital in Sheffield said it had seen more than 700 people in its A&E department over a two day period, as well as an increase of 43% in its orthopaedic department due to the cold snap.
The hospital has urged people to visit A&E only if it is a genuine emergency and to not visit the hospital if they are suffering flu-like symptoms such as diarrhoea or vomiting.