The deep freeze is continuing right across the country this morning spelling havoc for motorists.
Gardaí in some areas are advising against taking to the roads at all.
Bus Eireann is experiencing disruption and delays on Limerick city services, some inter-city services to Limerick, and slight delays on services operating through Dundalk, Cavan and Monaghan.
Some schools in Longford, Leitrim and Roscommon have also been closed.
Air travel across Britain and mainland Europe has been disrupted but the Dublin Airport Authority is only reporting minor delays.
It is however advising passengers to contact their airline before leaving for the airport.
Nicola Hudson, AA Roadwatch controller, said driving conditions were treacherous right across the country.
“Many national roads were treated, however a lot of secondary roads remain frozen since Sunday and very few routes have gone above freezing,” she said.
“Road temperatures dropped as low as minus 4.9 Celsius in parts of the south and east.
“There is both fresh and compacted snow as well as ice and black ice to contend with, there is a very high risk of skidding so make sure you know what to do.”
The AA Roadwatch said drivers have heeded warnings over the dangerous conditions.
“Traffic volumes are a little lighter than usual today, however most routes are slow-moving as people proceed with caution on the icy roads,” Ms Hudson said.
“There were no major road closures or major crashes reported during morning rush hour, although there were countless minor incidents on icy stretches countrywide.”
AA Roadwatch advised drivers not to brake if they skid on ice but use gears to reduce speed.
“This cold snap is forecast to continue up to Christmas Day, with further snow and ice expected,” warned Ms Hudson.
“Further heavy snow showers are expected tonight, with the severe icy conditions for the next few days.”