THE SAFETY EFFECT OF CONVERSION TO ALL-WAY STOP CONTROL

Past studies documenting the safety effect of converting intersection traffic control to all-way stops have consistently shown impressive accident reductions. Because, ordinarily, it was high-accident locations that were converted, it was difficult to know how much of the reduction was real and how much was an artifact of regression-to-the-mean. Data from three recent studies were reanalyzed and debiased. In addition, a new data set was assembled and examined. Analysis revealed that, although somewhat inflated, the reductions reported in the earlier studies were quite real and were confirmed by the new data. The empirical information contained in the data sets was captured in likelihood functions and the four functions were joined. Taken individually, the four data sets showed reductions in total accidents ranging from 37 to 62 percent. The joint likelihood function indicates a most likely accident reduction of 47 percent in total accidents.

• Record URL:
  • http://onlinepubs.trb.org/Onlinepubs/trr/1986/1068/1068-014.pdf
• Summary URL:
  • http://scholar.google.com/scholar_lookup?title=THE+SAFETY+EFFECT+OF+CONVERSION+TO+ALL-WAY+STOP+CONTROL&author=J.+Lovell&author=E.+Hauer&publication_year=1986
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/0309040620
• Supplemental Notes:
  • Publication of this paper sponsored by Committee on Methodology for Evaluating Highway Improvements.
• Corporate Authors:

  Transportation Research Board

  500 Fifth Street, NW
  Washington, DC  United States  20001
• Authors:
  • Lovell, Jane
  • Hauer, Ezra
• Publication Date: 1986

Media Info

• Media Type: Digital/other
• Features: Figures; References; Tables;
• Pagination: pp 103-107
• Monograph Title: TRAFFIC ACCIDENT ANALYSIS, ALCOHOL INVOLVEMENT, AND EVALUATION OF HIGHWAY IMPROVEMENTS
• Serial:
  • Transportation Research Record
  • Issue Number: 1068
  • Publisher: Transportation Research Board
  • ISSN: 0361-1981

Subject/Index Terms

• TRT Terms: Data analysis; High risk locations; Intersections; Mathematical analysis; Measures of effectiveness; Multiway stop signs; Safety; Traffic control; Traffic safety
• Uncontrolled Terms: Effectiveness
• Old TRIS Terms: Four way stop signs
• Subject Areas: Highways; Operations and Traffic Management; Safety and Human Factors; I73: Traffic Control; I81: Accident Statistics;

Filing Info

• Accession Number: 00474244
• Record Type: Publication
• ISBN: 0309040620
• Report/Paper Numbers: HS-039 862
• Files: TRIS, TRB
• Created Date: Oct 31 1990 12:00AM