Stay on top of the main developments as the big freeze continues to cause travel disruption for commuters across the country.
Conditions are dangerous in Co Louth. Drivers are warned of black ice on the Carrickmacross to Ardee Road and the N2 Dublin to Monaghan Road between Collon and Ardee.
There is freezing fog around Monaghan town, and secondary roads are very icy.
Snow fell in the capital yesterday causing disruptions and tailbacks with more snow forecast for today.
Motorists are warned to stay away from Kilgarron Hill, Enniskerry, the Wicklow Gap and the Sally Gap.
Carlow, Kilkenny, Wexford and Waterford were mostly unaffected by snow, but freezing weather continues to cause problems on roads.
Main routes are being gritted but minor roads are treacherous with black ice in spots.
The Conor Pass is closed in Kerry and upland areas of Cork are dangerous.
West Cork is very icy, particularly on the Macroom to Killarney Road, while parts of Cork city are also dangerous. HGV drivers are warned to avoid hills.
Roads in rural areas of Limerick, Tipperary and Clare continue to be treacherous following successive days of freezing temperatures. Frost and ice is causing problems for motorists and pedestrians around Tulla, Co Clare, and Upperchurch, Co Tipperary.
While the mid-west enjoyed another day of bright sunshine, temperatures did not get above 0C. The region has avoided heavy snowfalls, but this is forecast to change later today.
Traffic on all roads in Mayo is slow because of compacted snow and ice on all routes. Salt supplies are being conserved for heavily trafficked routes.
Galway remains very icy, with parts of Connemara particularly dangerous.
Record low temperatures have left the north-west in the grips of a big freeze, with treacherous driving conditions across the region. Roads in Donegal, Sligo and Leitrim remain dangerous and motorists are urged to only undertake essential travel.
In Co Donegal, the Errigal road is closed as salt levels reach critical levels. Hundreds of schools remained closed.
Dense freezing fog in Athlone, Mullingar and Longford is making driving conditions treacherous across the midlands.
Gardai have urged motorists to drive with extreme caution and keep their fog lights turned on.
Most county councils have put maps of the roads to be gritted on their websites, and have advised motorists to use these roads if possible.
Intercity, DART and Commuter services are operating this morning with some delays expected in badly affected areas as points are cleared of snow and ice.
Commuters are advised to allow extra travel time to arrive at stations due to poor road and footpath conditions.
Bus Éireann: The vast majority of services are operating as per normal with some delays and diversions in affected areas.
Bus Éireann have said they will will seek to maintain as many services as possible over the coming days subject to road and weather conditions.
Passengers are asked to visit the Bus Eireann website or contact their local travel centre for latest information on service changes
Dublin Bus: Dublin Bus is operating services on all corridors this morning but due road conditions there are a significant number of curtailments and diversions on some routes, particularly across the Southside of the city and in suburban housing estates.
Dublin Bus say that roads across the capital are very icy and they will contiunue to monitor the situation throughout the day. Passengers can keep up to date with the latest developments and changes to services via the Dublin Bus website.
Dublin Airport: Dublin Airport is fully operational however the adverse weather in the UK and across Europe has caused disruption to the flight schedule.
Passengers intending to travel from Dublin Airport are strongly advised to consult their airline or airline's website BEFORE going to the airport.
Cork Airport: Shannon Airport is open passengers are advised to check with the airport's website for information on delays and cancellations.
Shannon Airport: Shannon Airport is open, passengers are advised to check with the airport's website for information on delays and cancellations.
Ireland West Airport: Ireland West is open, passengers are advised to check with the airport's website for information on delays and cancellations.
Irish Ferries: All Irish Ferries sailings are expected to sail to schedule. For information contact: Irish Ferries Central Reservations (Ireland) 0818 300 400.
Stena Line: All Stena Line sailings are expected to sail to schedule. For information call 01 204 77 99 when travelling to Britain or +44 (0) 8705 755 755 when travelling to Scotland.
Celtic Link Ferries: All Celtic Link sailings are expected to sail to schedule. For information call 53 9162688.