A snow and ice warning remains in place for Donegal today.
The status orange warning for the North West took effect at midnight last night and is in place until later tongiht.
Forecasters expect between 4 and 8 centimetres of snow today.
Road users are being advised to clear their windows and mirrors and to have a screen scraper and de-icer at hand.
Brian Farrell from the RSA says black ice can be particularly treacherous at this time of year: