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		Major roads were identified by Transport Infrastructure Ireland (TII) and Local Authorities as those roads exceeding the flow threshold of 3 million passages per year during 2021.
		The dB value represents the annual average Lnight indicator value in decibels over the night time.  
		The values are calculated at a height of 4.0m above local terrain, not measured, and should be treated with caution when looking at specific locations. 
		The strategic noise mapping of the major roads was undertaken by Noise Consultants Limited inside the three noise agglomerations, under contract to the agglomeration local authorities, and outside the agglomerations by Transport Infrastructure Ireland (TII) with the support of the local authorities within whose functional areas the major roads were located. 
		The outputs of the Round 4 noise mapping exercise were generated using a new common noise assessment method for Europe (CNOSSOS-EU), as set out in the revised Annex II of Directive 2002/49/EC, and they are not directly comparable to any strategic noise maps previously generated under Rounds 1 to 3, as these revised methods calculate noise emissions, propagation and residential population exposure differently from the methods used in previous rounds.   
		The noise maps are the product of assimilating a collection of digital datasets, and over the last 15 years there have been ongoing significant improvements to the quality of the digital datasets describing the natural and built environment in Ireland, therefore the Round 4 strategic noise mapping includes changes to the model input datasets being used, compared to previous rounds, particularly related to the road network modelled, the terrain model, building heights, traffic flows and ground cover.
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		These strategic noise maps were prepared for Round 4 (2022), representing the annual average situation during 2021. 
		The strategic noise maps are to be used to identify priorities (Important Areas and Priority Important Areas) for noise action plans, which are to be made or revised every 5 years by designated action planning authorities, namely Local Authorities.  They can also be used to identify potential Quiet areas in the three noise agglomerations.
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			These strategic noise maps were prepared for Round 4 (2022), representing the annual average situation during 2021.    
			The strategic noise maps are to be used to identify priorities for noise action plans, which are to be made or revised every 5 years by designated action planning authorities, namely Local Authorities. They can also be used to identify potential Quiet areas in the three noise agglomerations.    
			This is a polygon dataset of the strategic noise mapping of major roads, which were identified by Transport Infrastructure Ireland (TII) and Local Authorities as those roads exceeding the flow threshold of 3 million passages per year during 2021, in the form of noise contours for the Lnight period for Cork, Dublin and Limerick noise agglomerations and the major roads outside of the noise agglomerations.    
			The contour polygons are derived by interpolation from calculated points on a regular 10m spacing located outside building footprints. Calculations were undertaken using Predictor-LimA software in line with the methodology in the consolidated Annex II of Directive 2002/49/EC as of 28 July 2022.    
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			The dB value represents the annual average Lnight indicator value in decibels over night time.     
			The values are calculated at a height of 4.0m above local terrain, not measured, and should be treated with caution when looking at specific locations.    
			The strategic noise mapping of the major roads was undertaken by Noise Consultants Limited inside the three noise agglomerations, under contract to the agglomeration local authorities, and outside the noise agglomerations by Transport Infrastructure Ireland (TII) with the support of the local authorities within whose functional areas the major roads were located.    
			The outputs of the Round 4 noise mapping exercise were generated using a new common noise assessment method for Europe (CNOSSOS-EU), as set out in the revised Annex II of Directive 2002/49/EC, and they are not comparable to any strategic noise maps previously generated under Rounds 1 to 3, as these revised methods calculate noise emissions, propagation and residential population exposure differently from the methods used in previous rounds.    
			The noise maps are the product of assimilating a collection of digital datasets, and over the last 15 years there have been ongoing significant improvements to the quality of the digital datasets describing the natural and built environment in Ireland, therefore the Round 4 strategic noise mapping includes changes to the model input datasets being used, compared to previous rounds, particularly related to the road network modelled, the terrain model, building heights, traffic flows and ground cover.
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