More than 10,000 people are taking part in today's Dublin City Marathon which started at 9 a.m.
The event, which celebrates its 25th anniversary, has attracted a near-record field this year. Today's field is the largest since 1982, when more than 11,000 runners entered and the Dublin marathon was one of the largest in the world.
About 5,500 runners have come from overseas, especially Britain and North America, but the increase in participation is largely explained by large numbers of Irish runners turning out for the anniversary event.
Gardaí have warned motorists of a number of traffic restrictions and some road closures.
The Marathon started at Nassau Street and proceeded through O'Connell Street to the Phoenix Park via North Circular Road. At Chapelizod the race turns up St Lawrences Road towards Inchicore. It will pass through Dolphins Barn, Walkinstown, Kimmage, Templeogue, Milltown, Stillorgan Road, Ballsbridge, Pearse Street and finish on Merrion Square.