A total of 1,400 complaints were made about buses and trains - with rude drivers, the cost of fares and late-running services some of the most common issues.
484 of them were about Bus Eireann services, according to the Irish Independent.
There were 81 about Irish Rail and 455 about Dublin Bus.
The announement comes after the NTA made a prior commitment to improve the Bus Éireann 133 route through Wicklow
The service from Wicklow was among a number of the most complained about, according to previous figures released by the NTA.
Serious concerns had been raised about the future of the route, amid claims that it was on a list of around 10% of routes that would be privatised.
However it will remain within the Direct Award Contract between the NTA and Bus Éireann until 2021 at which stage the service will be competitively tendered.
Wicklow TD John Brady says he also secured a commitment that a separate stand alone service between Bray and Wicklow Town will be considered by the NTA.
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