Fog and ice dangers set to continue
Motorists have been warned of the dangers of freezing fog and black ice as the sub zero temperatures continue for another two nights.
Met Eireann forecast snow falling in the north and west will spread across the midlands, with wintry outbreaks of sleet and snow in parts of Leinster and east Munster.
Temperatures are set to plummet to minus 8 degrees on Monday night, causing freezing fog and widespread ice on untreated roads and footpaths.
Snow is not expected to fall in Dublin, but the bitterly cold weather is due to last until Thursday when temperatures will rise and slowly thaw thick ice.
Noel Brett, of the Road Safety Authority, said dense fog reduces visibility and makes driving very dangerous.
"Freezing fog, when liquid fog droplets freeze to surfaces, can make it difficult to keep the windscreen surface clear. Combined with icy road surfaces, it's a driver's worst nightmare," he said.
"Road users should follow weather forecasts and general advice about driving conditions, and should avoid driving, cycling or walking in fog unless absolutely necessary."
Although main roads have been gritted, pedestrians are warned to take extra care on treacherous footpaths and in housing estates, with communities urged to clear ice from outside homes and businesses.
Health chiefs reported a 30% to 50% increase in the numbers attending emergency departments over the weekend, many suffering broken bones from falls.
The Defence Forces said more than 1,300 soldiers and 420 vehicles have been used to assist the civil authorities during the cold snap.