A two-car crash on the M50 southbound is blocking traffic and causing delays near the J7 exit for Lucan.
The crash, which happened shortly after 8am, occurred in the fast-lane and is causing delays on approach.
There are no reports of injuries and gardaí are at the scene.
A crash earlier this morning on the M7 northbound before J10 Naas South has been cleared.
Motorists are being warned of lingering fog in many areas around the country, particularly in the midlands and west.
