International Roughness Index , IRI (abbreviation)

International Roughness Index" at The World Bank (WB) "

A pavement roughness evaluation providing smoothness indicators such as the International Roughness Index (IRI).

The International Roughness Index (IRI) is the roughness index most commonly obtained from measured longitudinal road profiles.

The data collected by a profilograph is used to calculate the International Roughness Index (IRI), which is expressed in units of inches/mile or mm/m.

International Roughness Index" at The University of Michigan Transportation Research Institute (UMTRI) "

The International Roughness Index (IRI) is being adopted, and NAASRA will become obsolete.

The U.S. Federal Highway Administration (FHWA) and the World Bank (with its International Roughness Index... or "IRI") have established measurement procedures using Dipstick profiler data.

Why It's Not: A Federal Highway Administration official said that in identifying bad roads, USA Today relied only on one metric -- the International Roughness Index, which essentially measures how bumpy a road is.

But while the report seemed to comment on the overall condition of roadways, it was based on a very narrow analysis of one set of data - a measurement called the International Roughness Index, which gauges the smoothness of road surfaces.

These include transversal road profile, macro-texture measurements, longitudinal profile, rut depth, rut width, cross fall, curve radius, cracks, International Roughness Index (IRI), mean profile depth, vehicle speed, position relative to the start point, GNSS position, together with pavement imaging and time-stamping of measurements.