Some 20,000 people are taking part
Winners have crossed the finish line at the SSE Airtricity Dublin Marathon.
Bernard Rotich of Kenya took home the title in an estimated time of 2:15:53.
While Nataliya Lehonkova of Ukraine won the ladies race in 2:28:58.
And Ireland's Patrick Monahan took the wheelchair title in 1:49:54.
Road closures are in effect across the city as the marathon continues.
Closures are in place for the entire route within the city and county.
Some 20,000 people from across Ireland, the UK, USA and other countries are taking part.
The course started at Fitzwilliam Street Upper from 8:55am and finishes in Merrion Square North at around 5.00pm.
Organisers say traffic restrictions will be in place in the vicinity of Merrion Square until bank holiday Monday.
Participants are reminded that only an authorised clear bag will be accepted in the baggage area - no rucksacks will be allowed.
A full list of diversions and closures is available here
Engineering works are taking place between Killester/Skerries and Newry/Lisburn.
Northside DART, Drogheda/Dundalk and Enterprise services will be affected.
More information can be found here
A number of diversions are in place due to the closure of Merrion Sqaure North.
Full details can be found here
The Green and Red lines are running as normal, with trams every 10 minutes - finishing at 11.30pm.
However the operator says some services will be delayed and some services suspended to allow marathon participants to cross tracks.
A number of Dublin Bike stations will also be closed.
The stations affected are:
-Merrion Square East: Closed from 3.00pm Friday 27th to 10.00am Monday 30th
-Merrion Square West: Closed from 3.00pm Friday 27th to 10.00am Monday 30th
-Fitzwilliam Sq East: Closed from 3.00pm Friday 27th to 10.00am Monday 30th
-Mount Street Lower: Closed from 3.00pm Friday 27th to 10.00am Monday 30th