Drivers warned over road conditions
Motorists have been warned to take extreme care as icy conditions made roads across Ireland, north and south, treacherous.
AA Roadwatch said there were icy road conditions nationwide, with worst affected areas including parts of the south, south west and north west.
Gardai in Donegal warned against any unnecessary journeys and to avoid the Wicklow and Sally Gaps.
An AA spokeswoman said drivers should slow down for conditions. "Extreme care should be taken on all routes," she added.
In the north the authorities are battling against the fallout from some of the heaviest snowfall in 25 years.
Northern Ireland's airports have all reopened, but passengers were warned to continue to check with their airlines before leaving home as flight disruption in England and Europe continues to have a knock-on effect on domestic flights.
Belfast International Airport is open and operational, but a representative said: "However due to the severe weather right across the UK we can expect cancellations and delays to Sundays flights."
Despite continuing efforts to clear roads, motorists are recommended to avoid travelling if possible.
Freezing temperatures are likely to continue to cause difficulties throughout the day. Met Eireann said it was bitterly cold with patches of freezing fog and snow showers in the west, south west and north Leinster during the day.
It forecast another frosty night with lowest temperatures plummeting to between minus 4C and minus 10C.