International Roughness Index specifications around the world

The International Roughness Index (IRI) is an indicator used worldwide for the characterisation of longitudinal road roughness. This study summarised IRI limit values for new, reconstructed, or rehabilitated roads; for in-service (existing) roads; and road classification schemes used around the worl...

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Published in:Road materials and pavement design 2017-07, Vol.18 (4), p.929-965
Main Author: Múčka, Peter
Format: Article
Language:English
Subjects:
highways and roads
International Roughness Index (IRI)
pavement management
road maintenance
road profile
Roads & highways
Surface roughness
threshold
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description The International Roughness Index (IRI) is an indicator used worldwide for the characterisation of longitudinal road roughness. This study summarised IRI limit values for new, reconstructed, or rehabilitated roads; for in-service (existing) roads; and road classification schemes used around the world. An overview of practices in 35 US states and 29 non-US states was provided. Limit values are a function of road surface type, road functional category, road speed limit, road construction type, or average annual daily traffic (AADT). IRI specifications are defined for a broad range of evaluation lengths from several metres to the entire length of a section. Large differences in IRI limit values were observed for the same segment length among various countries. The IRI-based methodology used in US states was compared with that used in non-US countries. Non-US countries used more often specifications as a function of road functional category and AADT, and are based on percentile of IRI observations. US states used more often pay adjustment and specifications as a function of road construction type and road speed limit.
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subjects highways and roads
International Roughness Index (IRI)
pavement management
road maintenance
road profile
Roads & highways
Surface roughness
threshold
title International Roughness Index specifications around the world
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