Motorists have been urged to exercise caution due to heavy rainfall over large parts of the country.
AA Roadwatch has reported a significant increase in minor collisions throughout Leinster and Munster, as well as two fatal road crashes.
Heavy rain is forecast for the east and northeast of the country and gardaí have asked drivers to take road conditions into account.
Motorists are being asked to slow down and to use their headlights.
In Dublin, a four-car crash on the M50 led to tailbacks while an overturned car near the Red Cow junction caused diversions.
A crash on the Navan Road near Cabra meant delays in both directions while a truck that caught fire on the M9 in Co Kilkenny left traffic at a standstill.
Cork City Council has warned that a tidal surge along with strong winds could lead to flooding in low lying parts of the city.
It said the quays could be badly affected over the next few days and it has asked that householders and businesses take precautionary measures to protect their properties.
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Two die in separate crashes
Two men have been killed in crashes in Monaghan and Limerick.
A man in his 30s died after a three-car collision on the N2 near Castleblaney in Co Monaghan shortly after 11am.
Earlier, a 63-year-old man was killed in a collision in Athea in Co Limerick.
The man died after the car he was driving collided with another vehicle on the R523 at 7.10am.
He was pronounced dead at the scene and his body has been taken to University Hospital Limerick.
A 33-year-old man driving the other car was taken to the same hospital, but his injuries are not serious.
Gardaí are appealing for witnesses to the crash to contact them in Newcastle West on 069-20650.