United States Department of Transportation
i
Effectiveness of Alternative Skid Reduction Measures: Volume I: Evaluation of Accident Rate-Skid Number Relationships
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1978-11-01
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[PDF-13.27 MB]
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Abstract:Relationships were developed between wet-pavement accident rate and skid number for various combinations of highway type, area type (urban/rural) and traffic volume. Accident rate, skid number and related data were collected for two one-year periods on 428 highway sections located in 16 states. An extensive statistical analysis of the data was conducted using matched-pair comparisons regression analysis and analysis of covariance. The analyses found a small but statistically significant, influence of skid number on wet-pavement accident rate. A linear relationship with skid number explained the variation in wet-Pavement accident rate as well, or better, than any simple logarithmic or polynomial function. The differences in the slope of this linear relationship for various highway type-area type-traffic volume combinations were not statistically significant, so a single common slope was used. It was found that the slope of the wet-pavement accident rate-skid number relationship is sensitive to the dry-pavement accident rate. This sensitivity was quantified to further explain the relationship between wet-pavement accident rate and skid number. The relationships developed in this volume have been Incorporated in a computerized benefit-cost model for wet-pavement accident countermeasures. described in Volumes II and III of this report.
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