EVALUATION OF ACCIDENT RATE-SKID NUMBER RELATIONSHIPS FOR A NATIONWIDE SAMPLE OF HIGHWAY SECTIONS

The objective of this study was to establish the relationship between 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, 1-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 of covariance. The analyses found a small, but statistically significant, effect of skid number on wet-pavement accident rate. A linear relationship with skid number explained the variation in wet-pavement accident rate 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. Specific relationships between wet-pavement accident rate and skid number are presented. It was found that the slope of the wet-pavement accident rate-skid number relationship is sensitive to the dry-pavement accident rate. The sensitivity was quantified and is presented in the paper. Finally, the accident rate-skid number relationships developed in this study are compared with the relationships developed by previous researchers. /Author/

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 142-150
  • Monograph Title: Skidding Accidents: Ancillary Papers
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00163948
  • Record Type: Publication
  • ISBN: 0309025745
  • Report/Paper Numbers: Proceeding, HS-021 395
  • Files: TRIS, TRB
  • Created Date: Oct 13 1977 12:00AM