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 comparison, regression analysis and analysis of covariance. The analysis 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 polynamial 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. /FHWA/

  • Corporate Authors:

    Midwest Research Institute

    425 Volker Boulevard
    Kansas City, MO  United States  64110-2299

    Federal Highway Administration

    Engineering Research and Development Bureau, 1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Blackburn, R R
    • Harwood, D W
    • St John, A D
    • Sharp, M C
  • Publication Date: 1978-11

Media Info

  • Pagination: 250 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00311099
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: FHWA-RD-79- 22 Final Rpt., FCP 31H5-014
  • Contract Numbers: DOT-FH-11-8120
  • Files: TRIS, USDOT
  • Created Date: Jun 9 1980 12:00AM