United States Department of Transportation
i
Implementation of a localized roughness specification for use on Louisiana bridges : research project capsule : technology transfer program.
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2016-10-01
[PDF-225.60 KB]
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Abstract:The Louisiana Transportation Research Center has worked closely with the Bridge
Design section of the Louisiana Department of Transportation and Development
(DOTD) to develop a workable specification for standard and localized roughness
of bridges.
The draft specification has two components: standard assessment of the overall
International Roughness Index (IRI) of a bridge and localized assessment of
individual bumps, faults, and slope changes.
DOTD has extensive experience with standard IRI measures of pavement
roughness, but this experience is not directly transferable to bridges. DOTD also
has experience with localized roughness, but that experience has never been
applied to project acceptance. This project is an attempt to use the draft specification on pilot projects to assess
the specification’s strengths and weaknesses and to refine the specification as
needed. The objectives of the research are to decrease roughness on Louisiana
bridges and to assess benefits and costs associated with doing so.
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