Heavy snow has again caused widespread disruption to travel and flights at Dublin Airport have been suspended until 8am tomorrow morning at the earliest.
The Dublin Airport Authority said: 'Persistent heavy snowfalls since 12.30 today resulted in more than 15cm of snow at the airport.
'Passengers intending to travel from Dublin Airport tomorrow should consult their airline's website before making the journey to the airport.'
Aer Lingus, Ryanair and Aer Arann had already cancelled all flights out of Dublin this evening.
London's Heathrow Airport opened both runways today, but there were still major delays and cancellations.
There were also flight disruptions at Aberdeen, Edinburgh and Glasgow, as well as Gatwick, London Luton and London City airports.
As thousands of flights were cancelled across Europe, the European Union called on airports in member states to make better provision for severe weather conditions.
Ferry companies are experiencing a significant increase in passenger numbers because of the flight disruption.
Met Éireann has issued a new severe weather alert, warning of heavy snow, mainly over Leinster and parts of Munster.
There will also be widespread ice and some dense pockets of freezing fog.
The heavy snowfalls today have made already dangerous driving conditions even more hazardous.
Motorists are being asked to take extreme care, particularly in Dublin, Donegal and Wicklow.
Bus Éireann commuter services in the Greater Dublin area ended at 9pm tonight.
Dublin Bus ended all services at 10pm tonight and there will be no Nitelink services.
There are delays on intercity train, Dart and commuter services. The Luas Red and Green lines are operating normally.
Delivery of salt due on Thursday
A shipment of salt from Turkey is due to arrive into Cork Harbour at the city's South Jetties in two days.
The MV CFL Prospect is due to tie up at 7.30am with a cargo of 6,300 tonnes of salt for the National Roads Authority.
Unloading will begin shortly after 8am onto 100 trucks expected quayside to help deliver the salt around the country.
Three further shipments of salt are expected over the Christmas period bringing it to 15,000 tonnes of salt through Cork.