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HPMS IRI

Highway Information Seminar in Rosslyn, VA - November 17, 2004

HPMS IRI Data

Uses of IRI Data
Why IRI?
HPMS IRI observations
Improving IRI

Uses of IRI Data

National pavement needs: see the report "Status of the Nation's Highways, Bridges, and Transit: Conditions & Performance"
Performance of the NHS
Above uses can be referenced at: www.fhwa.dot.gov
Performance of the STRAHNET
Other studies

Why IRI?

Objective
Instrument-based
Science-based
Easily measured

IRI Data Reporting Requirements:

All Interstate sections
All Freeway and Other Principal Arterial sections
All rural minor arterial sample sections
All NHS sections
All STRAHNET sections

Graph shoiwng % mils with IRI, 100% are Interstate rural, OPA rural, Minor Arterial rural, NHS, and STRAHNET. 99% are Interstate urban, Other Freeways and Expressways urban,Other Principal Arterials urban, and STRAHNET. 98% NHS urban.

Updating HPMS IRI

Equal IRI values over time
Matched sample analysis: 1) Programmatically matches sections over time, and 2) Conservative estimate of severity
GIS analysis: 1) Map-based matching of sections over time 2) Utilizes NHPN GIS files with HPMS data, and 3) Closer estimate of severity

Updating HPMS IRI

Equal IRI values over time (Data not being collected/reported)
Data collected but not reported (Translation error/technical difficulties)
Requires communication and action to resolve

Graphic illustration of difference between matched sample and matched universe techniques for indentifying IRI values.

Map showing HPMS interstate IRI Data for 2001 and 2003.

Improving HPMS IRI Reporting

AASHTO PP 37-02 (new -04)
HPMS Field Manual (Appendix E)
HPMS CBT
2-year reporting cycle
Documented procedures
QA/QC program / CPI model
Link HPMS to PMS

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