Some €20m of the funding is to be used for maintenance
Almost €160m is being spent repairing and improving primary and secondary roads next year.
The bulk of the cash - €139.7m - is being allocated to improvements, while the remaining €20.2m is for maintenance.
Planned upgrades include the N4 Collooney to Castlebaldwin scheme, N5 Westport to Turlough and the N22 Ballyvourney to Macroom road.
The funding will also assist in the planning and development work associated with other projects included in the Capital Plan 2016-2022.
The funding, which will be allocated to local authorities across the country, will also facilitate pavement and minor works on the existing network and essential works on bridges.