Traffic is now moving well on all routes following the Oxegen Festival at Punchestown.
AA Roadwatch says traffic volumes on the N7/M7 and N81 have eased throughout the day.
All Dublin Bus and Bus Éireann services from the site to Dublin have now finished.
A total of 114 people were arrested over the weekend at the festival.
Gardaí say the arrests were for a variety of public order, road traffic, assault and drugs offences.