Road users in Eastern Counties are being urged to slow down and keep their distance.
Temperatures dipped to minus 5 degrees in places overnight leaving icy conditions on many roads, with further snow showers expected today.
A status yellow snow-ice warning is in place for Louth, Westmeath, Meath, Cavan and Monaghan until 6pm this evening.
Met Eireann says substantial snowfall is expected across the country tomorrow.
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