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Minnesota Department of Transportation Mn/DOT’s Gradual Shift from Profile Index to IRI

Minnesota Department of Transportation Mn/DOT’s Gradual Shift from Profile Index to IRI. Chronology of Shift to IRI. 1999 : Participated in FHWA’s Lightweight Profiler Study, hosting various vendors at MnRoad site

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Minnesota Department of Transportation Mn/DOT’s Gradual Shift from Profile Index to IRI

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  1. Minnesota Department of Transportation Mn/DOT’s Gradual Shift from Profile Index to IRI

  2. Chronology of Shift to IRI • 1999: • Participated in FHWA’s Lightweight Profiler Study, hosting various vendors at MnRoad site • Overall, LWP devices involved in study demonstrated moderate repeatability and poor reproducibility

  3. Chronology of Shift to IRI • 2001: • Purchased Ames Lightweight Profiler and ARRB Walking Profiler • Began performing random Quality Assurance on projects with ride incentive determined from 0.2” blanking band Profile Index

  4. Mn/DOT’s Lightweight Profiler

  5. Chronology of Shift to IRI • 2002: • Initiated Profile Index Smoothness Measuring Device Program in spring • During QA on job sites, experienced problems replicating contractors’ 0.2” blanking band Profile Index values

  6. 0.2” Blanking Band PI vs. IRI • Empirical Data: • Projects with 0.2” blanking band PI value of 0.0 possessed IRI values ranging from roughly 27 - 42 in/mi • Projects with 0.2” blanking band PI value of 1.0 possessed IRI values ranging from roughly 29 - 46 in/mi

  7. Chronology of Shift to IRI • 2002 - 2003: • Analyzed extensive certification and construction data, finding a very weak correlation between 0.0” and 0.2” blanking band Profile Index results

  8. Chronology of Shift to IRI • 2004: • Let three bituminous IRI pilot construction projects • 2005: • Let 13 additional bituminous IRI pilot construction projects

  9. Chronology of Shift to IRI • 2006: • Let three concrete IRI pilot projects (results pending) • Switched to IRI exclusively on bituminous construction projects • Began using Pathways High Speed Profiler for Quality Assurance purposes

  10. Mn/DOT’s High Speed Profiler

  11. Bituminous Ride Incentive Equations

  12. Bituminous Ride Incentive Equations Incentive per 528-Foot Segment

  13. Bituminous IRI % Improvement Table

  14. Ride Incentive Information • Incentive/disincentive calculated for each 528-foot segment • Payment is based on right wheel path IRI values (9 feet from left stripe) • IRI data collected by contractor with certified profiler • Bump/dips established with profilograph

  15. Chronology of Shift to IRI • 2007: • Will use IRI exclusively to determine ride incentive for all construction projects

  16. Any Questions?

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