TRAFFIC CONFLICTS AS A DIAGNOSTIC TOOL IN HIGHWAY SAFETY

Accident repeatability from one year to the next was found to be high at 60 intersections (r equals 0.64) and 170 spot locations (r equals 0.59). Nearly half of the 209 Kentucky locations designated as hazardous by accident criteria were found to have been so identified falsely because of random accident occurrences. Conflict counts were conducted at 5 intersections in central Kentucky to determine characteristics of conflict data. Good reliability was found between observers in simulataneous counts of conflicts and weaves with r values as high as 0.93. Traffic volumes accounted for only about 30 percent of the variation in numbers of conflicts. Reductions in conflicts and accidents that resulted from such safety improvements as installing left-turn signal phasing, raised pavement markers, and green-extension systems at numerous locations were determined. A revised procedue for collecting and utilizing conflict data was described. /Author/

• Record URL:
  • http://onlinepubs.trb.org/Onlinepubs/trr/1978/667/667-007.pdf
• Record URL:
  • https://scholar.google.com/scholar_lookup?title=TRAFFIC+CONFLICTS+AS+A+DIAGNOSTIC+TOOL+IN+HIGHWAY+SAFETY&author=C.+Zegeer&author=R.+Deen&publication_year=1978
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/03611981
• Supplemental Notes:
  • This paper appeared in TRB Research Record No. 667, Highway Capacity, Measures of Effectiveness, and Flow Theory. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved Publication of this paper sponsored by Committee on Methodology for Evaluating Highway Improvements.
• Authors:
  • Zegeer, Charles V
  • Deen, Robert C
• Discussers:
  • Yauch, Peter J
  • Parsonson, Peter S
• Publication Date: 1978

Media Info

• Media Type: Print
• Features: Figures; References; Tables;
• Pagination: pp 48-57
• Monograph Title: Highway capacity, measures of effectiveness, and flow theory
• Serial:
  • Transportation Research Record
  • Issue Number: 667
  • Publisher: Transportation Research Board
  • ISSN: 0361-1981

Subject/Index Terms

• TRT Terms: Correlation analysis; Crash rates; High risk locations; Highway safety; Improvements; Intersections; Traffic conflicts; Traffic counting
• Subject Areas: Data and Information Technology; Highways; Safety and Human Factors;

Filing Info

• Accession Number: 00189850
• Record Type: Publication
• Report/Paper Numbers: HS-025 846
• Files: TRIS, TRB
• Created Date: Apr 12 1979 12:00AM