Directive 2002/49/EC on the assessment and management of environmental noise was transposed into Irish law by the Environmental Noise Regulations, 2006. This legislation requires Transport Infrastructure Ireland (TII) and local authorities to undertake strategic noise mapping every five years for all major roads carrying in excess of 8,250 annual average daily traffic (AADT). Noise maps identify and prioritise cluster areas which will require further assessment and may require mitigation measures to be put in place.
Once strategic noise maps have been produced, the results are used for each local authority to develop Noise Action Plans as required by the Environmental Noise Regulations. Under the Regulations, the Noise Action Planning Authorities are required to consult with the public when revising their current Plans. I understand that the Cork Agglomeration Noise Action Plan 2018 - 2023 has been adopted by Cork City Council. This process included a public consultation period, providing interested parties with an opportunity to engage with the local authority.
Specifically in relation to the N40 on the south side of Cork City, I have referred your question to TII for a direct reply. Please advise my private office if you do not receive a reply within 10 working days.