Motorists are advised to take care
A Status Yellow snow and ice warning for Carlow and the entire country is due to expire by 11am on Tuesday but the risk of dangerous road conditions is to continue overnight.
Met Éireann says it will be very cold overnight, but mainly dry, with clear spells.
Temperatures will fall close to freezing, with a risk of frost and icy patches on untreated surfaces.
A few mist patches may develop also, in light west to northwest breezes.
Wednesday will still be quite cold and mainly dry, with bright or sunny spells, but a few isolated light showers may occur.