West Midlands and Cheshire are considered to be at greatest risk with showers tracking south-eastwards towards Birmingham, but drivers should take care on all high level routes in the region.
Met Éireann has upgraded a snow-ice warning for several counties across the country.
Accumulations of up to three centimetres are possible in parts while icy conditions are likely on the roads.
GARDAI have issued a warning about snow and ice as a national weather alert remains in place.
Forecasters say: "Snow showers will occur this evening, tonight and during Friday".
Snow accumulations of up to 3cm are predicted for the north and northwest.
It became valid at 4pm today and will stay in place until 6pm tomorrow.
Meanwhile, a status yellow weather warning for snow and ice is also forecast for Munster as well as counties Dublin, Carlow, Kildare, Kilkenny, Laois, Louth, Wexford, Wicklow, Offaly, Westmeath, Meath and Roscommon.
Sunday's warning, which covers Derbyshire and Nottinghamshire and is in force between 4am and 11.55pm, states: "A spell of heavy snow is possible over some central parts of the United Kingdom during Sunday".
Widespread sharp ground frost will form tonight along with icy patches ahead of another cold day on Friday. "Most days it will be less than 6 or 7 degrees".
Feeling raw in the strong northwesterly winds, bringing a significant wind chill.