Drivers are being warned to take care while driving over the weekend amid a severe weather warning from Met Éireann, which forecasts blizzards in places.
Heavy falls of snow are forecast to affect much of Ulster, with sleet and snow showers over north Connacht and parts of north Leinster
Between 5-10cm of snow or sleet is predicted in some areas.
In east Down, around 2,400 homes and businesses are now without power due to the severe weather.
This afternoon and evening are also forecast to be extremely cold.
The Road Safety Authority is warning drivers to check their local weather forecast before making any journeys.
It is also advising motorists to slow down, stay vigilant and to allow extra time to complete their trip.
AA Roadwatch reported an extremely difficult day on the roads yesterday with flooding and snowfall causing major problems through east Leinster, parts of the midlands and Ulster.
Co Wicklow was the most severely affected with snow on higher ground and many roads blocked due to flooding and landslides around Delgany.
Meanwhile, flights to Britain have been delayed and cancelled as a result of adverse weather conditions.
Both Ryanair and Aer Lingus cancelled flights from Dublin to Cardiff and Bristol yesterday.
Further Aer Lingus flights to Bournemouth and Heathrow were also cancelled.
The two Irish airlines are warning of weather related delays are urging passengers to check their websites this morning for updated information.
Heavy snow falls have caused significant delays and disruption in Britain, with wintery weather sparking a rare "red warning" in Wales.
At least 70 flights were cancelled yesterday at Heathrow, while flights at Southampton, Bristol, Glasgow, Jersey and Newcastle were also affected.
British Airways said it had cancelled 60 flights.
The northern runway at Heathrow was also shut for a time yesterday for de-icing and snow clearing.