The price of travel on bus, tram and train has been reduced.
From today, young adults can get a 50 per cent cut on public transport fares across the country.
19 to 23 year-olds can avail of the discount by applying for the new 'Young Adult Leap Card', which will work alongside the 'Student Leap Card.'
A 20 percent fare reduction also comes into place today for all passengers in the greater Dublin area.
The 90 minute flat fare will also fall to €2.00 for adults and 65c for children.
It comes following a 20% reduction in local link services and Bus Eireann fares in Galway, Limerick, Waterford and Cork last month.