Establishing IRI Thresholds for the District of Columbia
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2009-03-26
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Edition:DRAFT FINAL RESEARCH REPORT
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Abstract:The Federal Highway Administration (FHWA) requires each state to report the International Roughness Indices (IRI) of its road network in the annual Highway Performance Monitoring System (HPMS). The reported IRI for road segments are compared to the national standards developed by the FHWA based on national data. Deviations from the national standards are used to identify road segments that need to be included in repair or maintenance programs. The FHWA established, for all road classes, an IRI of 170 in/mi or less is deemed “acceptable”, and 95 in/mi or less is categorized as “good”. The use of the IRI for identifying sections of highways for repair and rehabilitation has been under review in several states. There is concern that the national values of the IRI are often in conflict with the ride smoothness perceived by an average citizen in the specific jurisdiction. This study obtained the ride ratings of residents of the District of Columbia and correlated them with the IRI values for selected road segments. This report presents the IRI thresholds developed for the District of Columbia based on the regression models obtained and the standard IRI thresholds for newly constructed pavement.
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