ASTM-E1926 › Historical Revision Information
Standard Practice for Computing International Roughness Index of Roads from Longitudinal Profile Measurements
The following bibliographic material is provided to assist you with your purchasing decision:
Scope
1.1 This practice covers the mathematical processing of longitudinal profile measurements to produce a road roughness statistic called the International Roughness Index (IRI).
1.2 The intent is to provide a standard practice for computing and reporting an estimate of road roughness for highway pavements.
1.3 This practice is based on an algorithm developed in The International Road Roughness Experiment sponsored by a number of institutions including the World Bank and reported in two World Bank Technical Papers (1) (2). Additional technical information is provided in two TRB papers (3) (4).
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Significance and Use
This practice provides a means for obtaining a quantitative estimate of a pavement property defined as roughness using longitudinal profile measuring equipment.
5.1.1 The IRI is portable in that it can be obtained from longitudinal profiles obtained with a variety of instruments.
5.1.2 The IRI is stable with time because true IRI is based on the concept of a true longitudinal profile, rather than the physical properties of a particular type of instrument.
Roughness information is a useful input to the pavement management systems (PMS) maintained by transportation agencies.
5.2.1 The IRI for the right wheel track is the measurement of road surface roughness specified by the Federal Highway Administration (FHWA) as the input to their Highway Performance Monitoring System (HPMS).
5.2.2 When profiles are measured simultaneously for both traveled wheel tracks, then the MRI (average of the IRI for each profile) is considered to be a better measure of road surface roughness than the IRI for either wheel track.
Note 1—The MRI scale is identical to the IRI scale.
IRI can be interpreted as the output of an idealized response-type measuring system (see Test Method E 1082
IRI is a useful calibration reference for response-type systems that estimate roughness by measuring vehicular response (see Test Method E 1082
IRI can also be interpreted as average absolute slope of the profile, filtered mathematically to modify the amplitudes associated with different wavelengths (3).
Keywords
highway performance monitoring system; HPMS; international roughness index; IRI; longitudinal profile; pavement management systems; pavement roughness; PMS; ICS Number Code 93.080.99 (Other standards related to road engineering)
To find similar documents by ASTM Volume:
04.03 (Road and Paving Materials; Vehicle-Pavement Systems)
To find similar documents by classification:
93.080.99 (Other standards related to road engineering)
This document comes with our free Notification Service, good for the life of the document.
This document is available in either Paper or PDF format.
Document Number
ASTM-E1926-98(2003)
Revision Level
1998 R03 EDITION
Status
Superseded
Modification Type
Reapproval
Publication Date
Dec. 1, 2003
Document Type
Practice
Page Count
18 pages
Committee Number
E17.33