Establishing International Roughness Indices
For A Dense Urban Area – Case Study In
Washington, DC
Author(s)
S. A. Arhin, E. C. Noel & M. Lakew
Abstract
The Federal Highway Administration (FHWA) requires each state in the United
States to report the International Roughness Indices (IRI) of their 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 IRI thresholds for all road classes range between
170 in/mi and 96 in/mi for \“acceptable” pavements, and 95 in/mi or less for
\“good” pavements. The use of the IRI for identifying sections of highways for
repair and rehabilitation has been under review in several states. There is the
concern that the national values of the IRI often do not reflect the ride
smoothness perceived by citizens in the specific jurisdictions. This research
obtained the ride quality ratings of residents of a dense urban area (Washington,
DC) and correlated those with the IRI values for selected road segments. This
research presents the IRI thresholds developed for the urban area based on the
regression models obtained and the standard IRI thresholds for newly
constructed pavement.
Keywords: International Roughness Index, deceleration, braking.
1 Introduction
Since the development of the International Roughness Index (IRI) in the early
1990s, all states have been required by the Federal Highway Administration
(FHWA) to report bi-annually IRI results through their Highway Performance
Keywords
International Roughness Index, deceleration, braking
Related Book
Other papers in this volume
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