Interstate Highway Pavement Sampling: Final Phase 2 Report
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2020-03-01
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Edition:Final Phase 2 Report
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Abstract:The Moving Ahead for Progress in the 21st Century Act (MAP-21) and Fixing America’s Surface Transportation (FAST) Act required that pavement performance measures be established for the Interstate Highway System (IHS). Because the measures rely on pavement condition data stored in the Highway Performance Monitoring System (HPMS), FHWA undertook a study in 2015 to: (1) collect an unbiased baseline condition of a statistically significant sample of the entire IHS and produce a report indicating the pavement condition on the IHS nationally and in each State where data were collected, (2) determine if HPMS is an unbiased representation of the pavement condition of the IHS, and (3) recommend improvements to HPMS data collection and reporting necessary to make HPMS unbiased or improve its precision. The results provided the outcomes needed at the time. Two years later, FHWA pursued a follow-up study addressing the same objectives plus some additional investigations. Working toward these objectives, a literature review was conducted and presented in this report to identify new developments in the HPMS area. The 2016 HPMS data was reviewed for data completeness and various stratification factors were considered. This review provided the basis for selecting a route to collect a 7,500 mile sample reflecting actual stratification of the entire IHS (based on climate zone, population zone, surface type, and terrain) as observed from the 2016 HPMS. This report addresses the development and execution of the data collection plan, including the data quality management plan (DQMP) that was developed for data collection and data analyses. The report also details the data analyses activities that were performed as part of the study, including the associated conclusions and recommendations.
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