Some driving tests have been cancelled this morning due to dense fog.
The Road Safety Authority says that morning fog has caused disruption around the country.
Morning tests have been cancelled at centres in Castlebar, parts of Galway, Carlow, Waterford, Clonmel, Cork and Limerick.
The RSA says alternative driving tests will be arranged free of charge.
Meanwhile, The AA is warning of very heavy traffic across the country this afternoon.
It's the Friday before Christmas and hundreds of thousands of people are heading home for the holidays.