Road, rail, air: What's operating and what's been hit
Many services were curtailed or diverted due to icy roads, with slow traffic adding to delays. Some services were unable to complete their normal routes.
On the Southside, No 2 buses were unable to serve St John's Church or Sydney Parade Road, while No 7 buses were unable to serve Loughlinstown and were terminating in Cherrywood, and were also unable to get to Glenageary Road lower. The 7, 7A and 45 were unable to serve Blackrock village and were using the Blackrock bypass and Frascati Road.
The number 25b was unable to serve Adamstown and terminating at Superquinn, Lucan.
On the Northside, the 31 and 31b were unable to serve the Hill of Howth and were terminating at Howth Harbour. The33b was unable to serve Seaview, The Burrow or Portrane Hospital, while the 41b could not serve Rolestown and was terminating at Swords Manor.
In the Dublin mountains, the 44 and 44b were unable to serve Ballyogan estate, or Glencullen. The 50 bus could not serve Killinarden in Tallaght. A full list of disrupted services is on www.dublinbus.ie "We will continue to monitor all routes and corridors throughout the day," Dublin Bus said.
The Luas Red Line was operating a full service between The Point and Tallaght Stops, while the Green Line was also operating a full service between St. Stephen's Green and Brides Glen Stops.
Passengers were advised to check www.transport.ie and to listen to local and national media including AA Roadwatch for Luas service updates.
Luas Customer Care is contactable on Freephone 1800 300 604 and email@example.com
Most services around the country operated as normal this morning with "some delays and diversions" in affected areas.
The main commuter routes in the east and north east were operating. Some town-to-town services in the north east were hit.
The company said it would make "every effort" to maintain as many services as possible over the coming week, subject to road and weather conditions.
It was closely monitoring weather and road conditions throughout the day. Customers were asked to visit www.transport.ie or www.buseireann.ie or contact their local travel centre for the latest information.
School closures combined with weather and road conditions, particularly on secondary and minor roads, resulted in some disruption to school transport services in affected areas this morning.
Road passenger services currently affected by weather and road conditions included some services in the east:
The Route 33: Dublin/Derry -- 1000 departure from Dublin was cancelled; Route 111 Cavan/Athboy -- was operating between Cavan/Granard only; Route 121: Edenderry/Tullamore -- was operating with delays but was not serving Croghan or Rhode; Route 133 Wicklow-Dublin -- had some disruption to departures; Route 163 Drogheda/Donore -- was cancelled; Route 166 Dundalk Carrickmacross -- was not serving Inniskeen. Cancelled serves included those to Cavan, Route 168 Dundalk/Annagassan, Route 175 Monaghan/Cavan; Route 189 Drogheda/Clogher , Route 190 Drogheda/Laytown; Balbriggan Town Service; Drogheda Town Services. In Dundalk, the town bus service was not serving Marian Park or Coxes.
Dublin Airport was "fully operational" today. The Airport Authority said: "Our snow and ice clearing crew worked throughout the night to clear the runway, taxiway and associated apron areas in time for the start up of flight operations this morning."
Disruption to flight schedules may occur should weather conditions deteriorate further, the DAA warned.
Passengers were advised to consult with the airline or airline's website BEFORE coming to the airport.
Further updates were on http://twitter.com/dublinairport
Shannon & Cork Airports were fully operational this morning.
Heavy snowfall overnight resulted in dangerous and difficult roads in Dublin in particular, AA Roadwatch said. Severe ice remained around the country, especially in Monaghan and Louth with fresh snow in Connacht. It advised "extreme care" on all routes around Dublin. Conditions were treacherous on the southside, with northside routes badly affected as well. Conditions were "very bad" in Blackrock, Dundrum and Milltown, while Sandyford Road was almost impassable coming from Dundrum. Road conditions were also extremely poor on the N11/Stillorgan Road between Fosters Ave and Goatstown almost impassable.
On the Northside ,the M1 was down to one lane in both directions between the Balbriggan exits, J6 and 5, while routes around Rush, Lusk and Skerries were treacherous. The Phoenix Park had a number of road and gate closures due to the poor weather.
The National Roads Authority said road temperatures in many areas were below freezing, with the air temperature on the N3 Cavan recorded at -13.3 C at 7.20am today.