Motorists have been advised to drive with care due to fog in many parts of the country.
AA Roadwatch says there is heavy fog in the east, midlands and west of the country.
Met Éireann has tonight issued a fog warning and says visibility may be as low as 100m in some areas. Drivers are asked to use their fog lights in the affected areas.
The worst affected routes are the M4 near Kilcock, the M6 between Rochfortbridge and Oranmore, and the N7 around Portlaoise.
There were also icy road conditions in many parts earlier today as a result of freezing overnight temperatures.
Meanwhile, a truck carrying chemicals overturned on the N52 Kells to Ardee Road in Co Meath. There were no injuries.
There have also been a number of crashes on the Dundalk to Castleblayney road, including a three-car accident. Motorists are advised to avoid the road if at all possible.
