The development is funded by the Government's July Stimulus package.
In what's being described as the biggest enhancement in services since 2005, Bus Eireann have announced the creation of 120 new jobs.
The new drivers will be needed to service a number of routes across the country.
Navan's town service will now run every half hour until 11.30pm Monday to Friday.
A new Cork City service has been introduced, linking Glanmire with Cork University Hospital via the city centre with additional evening and weekend services.
Portrow in County Tipperary will be served by the improved Neenagh to Limerick route while a weekend service connecting Scarriff to Limerick has also been introduced.
Limerick city's 303 will now run every 15 minutes.
West Clare will benefit from increased frequency between Ennis and Kilkee, Doonbeg and Lahinch, stopping off at Ennis train station.
The Greater Dublin Area will benefit from a revised timetable with greater punctuality and reliability.
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