The National Transport Authority is also aiming to ensure private bus firms run low-floor buses by 2026
Dublin Bus has been fully accessible since 2013 -- but Bus Éireann services outside the capital have lagged behind.
The announcement follows criticism from the Disability Federation of Ireland and the National Bus and Rail Union.
Transport planners say it's a measure they're considering, as they consult with operators on how to improve access.
The National Transport Authority admits public transport for people with disabilities in rural Ireland is "patchy at best".