Met Éireann has extended a status yellow warning for fog until tomorrow morning.
The nationwide alert came into effect yesterday afternoon and was due to expire at 10am this morning.
However, forecasters now say the fog will linger in some parts of the country for much of today, before it becomes widespread and dense again this evening.
The warning will now remain in place until 9am on Sunday.
Status Yellow - Fog warning for Ireland
Update: Fog will be slow to lift and will linger in some parts for much of Saturday. Becoming widespread and dense again on Saturday evening, but retreating to northern areas by Sunday morning.
Valid until Sunday 9 a.m. pic.twitter.com/fGZIeNF5mK— Met Éireann (@MetEireann) December 21, 2019
Meteorologist Cathal Nolan explained that road users need to be particularly careful due to the foggy conditions.
He said: "Certainly many of us are waking up to some quite dense fog across the country this morning, and indeed we do expect that that fog will continue on for quite a number of hours.
"The advice to motorists certainly is to reduce speed and of course put on your fog lights. Drive with care, as the visibility is greatly reduced due to the denseness of the fog."
