Severe flooding disrupted many motorists in the east and midlands this morning on the first day after the Easter school holidays.
Torrential rain overnight left many areas under several inches of water, with Dublin the worst hit.
"Drivers in north Co Dublin were the worst-affected this morning, with flooding on routes around Malahide, Balbriggan, Rush, Lusk, and Skerries," said Nicola Hudson of AA Roadwatch.
"The worst-affected area was Blakes Cross, Lusk which was severely flooded and did not reopen until after midday.
The flooding on the R132 at Blakes Cross resulted in traffic from Lusk having to travel north to the Five Roads and onto the M1 before resuming the journey south to Dublin City Centre. The Ballyboughil Road and the M1 at the Balbriggan exit were very heavy all morning as a result.
Furthermore, on the M1 northbound, there was no exit at Balbriggan due to flooding for a number of hours.
A number of other roads were closed or impassable due to flooding; including the Clonshaugh Road and The Hole in the Wall Road in Coolock, both of which closed until 9.30am.
The Old Portmarnock Road and Kinsealy Lane were closed until 10.45am. There was flooding on the Cappagh Road and nearby on the Ballycoolin Road in BlanchaRoadstown at Rosemount Industrial Estate until late morning.
Flooding in Malahide village subsided around midday and further north there was flooding in Skerries, at the roundabout, near the railway bridge and at the entrance to Skerries Mills.
Drivers on the N7 Limerick-to-Dublin road had to navigate through flooding at Roscrea and further north in Co Laois at Mountrath where the River White Horse burst its banks.
A number of regional roads in the Naas, Kill and Clane areas were also badly flooded for a number of hours.
Rain cleared this morning, but further rain will spread from the Atlantic during the afternoon and evening, with freshening southerly winds.