Up to 85,000 people are expected to descend on Punchestown over the weekend as Oxygen 2011 kicks off.
The weekend will see some of the world's biggest acts taking to the stage, with The Script and the Black Eyed Peas headlining the main stage tonight, The Arctic Monkeys and Foo Fighters playing tomorrow evening, and Beyonce and Coldplay rounding off the festival in style on Sunday night.
Superintendent John Gilligan from the Garda Press Office said there is a major traffic and security operation now in place.
Gardaí and event promoters MCD have urged those attending to use the advanced Park and Ride facilities available for the event.
Details of traffic plans are available on the Garda and MCD websites as well as further information at the dedicated festival website, Oxegen.ie.
Showers and sunny spells have been forecasted for the weekend.
Crowds are arriving in Punchestown
RTÉ 2fm will offer its most extensive coverage of the Oxegen festival this year, with an integrated radio, web and TV production live from the festival for the first time.
The station's Oxegen website will feature video interviews, acoustic sessions, webcam streams and video blogs, which will also appear on RTÉ Ten, RTÉ.ie, RTÉ 2fm's Youtube channel, and, for the first time, on RTÉ Television via News Now, the new 24 rolling news channel.
