United States Department of Transportation
i
Validating the Collection of Skid Data by Assessing Correlation With Crash Data
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2024-11-01
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[PDF-1.05 MB]
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Edition:Final Report Sep 2022 to Nov 2024
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Abstract:Pavement friction, as measured by metrics such as the skid number (SN), may be linked to traffic safety outcomes. To examine this hypothesis, this cross-sectional study collected data from an interstate highway (I-15) and a non-interstate highway (US-89) within the state of Utah, covering the years 2016 to 2019. For each segment, data included traffic volumes, SN values, roadway geometric characteristics, and crashes by type (wet vs. dry weather, property damage only vs. injury-related, and total). Analysis involved estimating negative binomial crash frequency regression models and generating safety performance functions and crash modification factors. The analysis found a significant negative association between the SN and crash frequency across all types of crashes and on both interstate and non-interstate highways. This finding means that enhanced pavement friction appears to reduce crashes. The crash reduction potential of an increase in SN was particularly strong on interstate highways and during wet weather conditions. These findings suggest the continued collection of SN data and targeted enhancement of pavement roughness in places with the greatest potential for crash reductions.
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