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/

• Record URL:
  • http://onlinepubs.trb.org/Onlinepubs/trr/1976/624/624-016.pdf
• Summary URL:
  • http://scholar.google.com/scholar_lookup?title=EVALUATION+OF+ACCIDENT+RATE-SKID+NUMBER+RELATIONSHIPS+FOR+A+NATIONWIDE+SAMPLE+OF+HIGHWAY+SECTIONS&author=D.+Harwood&author=R.+Blackburn&author=A.+St+John&author=M.+Sharp&publication_year=1977
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/0309025745
• Supplemental Notes:
  • This article appeared in Transportation Research Record No. 624, Skidding Accidents--which contains ancillary papers to the proceedings of a conference conducted by the Transportation Research Board, May 2-6, 1977.
• Authors:
  • Harwood, D W
  • Blackburn, R R
  • St John, A D
  • Sharp, M C
• Conference:
  • Second International Skid Prevention Conference
  • Location: Columbus Ohio, United States
  • Date: 1977-5-2 to 1977-5-6
• Publication Date: 1977

Media Info

• Media Type: Digital/other
• Features: Figures; References; Tables;
• Pagination: pp 142-150
• Monograph Title: Skidding Accidents: Ancillary Papers
• Serial:
  • Transportation Research Record
  • Issue Number: 624
  • Publisher: Transportation Research Board
  • ISSN: 0361-1981

Subject/Index Terms

• TRT Terms: Crash rates; Data collection; Mathematical models; Pavements; Skidding; Statistical analysis; Traffic volume; Wet weather
• Uncontrolled Terms: Skid number; Wet pavements
• Subject Areas: Data and Information Technology; Highways; Pavements; Safety and Human Factors;

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