A study of all national and secondary roads has provided the stark insight.
A third of Offaly's roads are among the worst rated in the country.
The National Oversight and Audit Commission has published a study of the quality of Ireland's regional road network.
The local government watchdog rated 30 per cent of local primary and secondary roads in the Faithful County in the lowest category for surface quality.
Fianna Fáil councillor Eamonn Dooley feels there are two reasons in particular for the low quality of certain roads: