Gardaí are warning people to drive with extra care this evening and tonight as the cold snap continues.
Temperatures are expected to plummet as low as minus 8 degrees in places tonight resulting in treacherous driving conditions.
The Christmas exodus is underway with tens of thousands of people expected to use the roads and public transport.
Main roads have been gritted but secondary routes remain dangerous.
There is also still some disruption to Bus Éireann services.