Further wintery showers and high winds are forecast to affect several parts of the country today.
Met Éireann said heavy showers will affect parts of the west and southwest, with hail, sleet and snow likely.
The forecaster said it would be a cold day with highest temperatures of 3 to 7 degrees.
A more prolonged spell of rain or sleet will develop across the southern half of the country early tonight and this will turn to snow in places further inland. It will clear later but with lowest temperatures of -2 to +3 degrees and clear skies will lead to a sharp ground frost and icy patches will form before dawn.
Overnight frost last night brought icy stretches to some roads this morning, making driving conditions hazardous.
Noel Brett of the Road Safety Authority urged drivers to exercise caution and to consider postponing journeys unless absolutely necessary.
He said road users need to pay attention to “local weather and traffic reports, be extremely careful and heed any Garda messages in relation to travel.”
“With bad weather forecast, we need to be prepared for these severe weather conditions of stormy winds, patches of ice and snow showers,” he added.
And he warned commuters to be vigilant of black ice particularly in sheltered areas.
Declan Geoghegan of the Irish Coast Guard warned that “the combination of tides, forecasted gale warnings for the next day or so, high sea conditions and swollen rivers may result in very dangerous conditions”.
Meanwhile Eircom said there are up to 5,000 reported faults on its network due to the bad weather. The company said some 2,000 new faults were reported on Monday with a further 2,000 yesterday.
It said while fault levels are high nationally the worst affected areas were along the coast.