Passengers are being advised to arrive early to avoid delays.
Passengers heading to Dublin Airport today should give themselves plenty of time, according to Bus Eireann.
High volumes of people are expected to be travelling this Bank Holiday weekend.
It comes as several festivals and events are taking place, including the Women’s Mini Marathon in Dublin tomorrow.
Mark Mulqueen, Head of Corporate Affairs and Communications, says it's likely there will be congestion:
 

                                        
                                        
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