APPLICATION OF STATISTICAL CONCEPTS TO ACCIDENT DATA

EXAMPLES OF APPARENT ERRONEOUS CONCLUSIONS DRAWN FROM ACCIDENT DATA ARE CITED. STATISTICAL PROCEDURES THAT CAN BE EMPLOYED TO ASSURE DATA RELIABILITY UNDER THREE SITUATIONS WERE DESCRIBED. THE THREE SITUATIONS ARE' THREE RANGE OF VARIABILITY TO BE EXPECTED DUE TO CHANGE IN ACCIDENT RATES FOR HIGHWAY SEGMENTS WITH DIFFERING VEHICLE-MILES OF TRAVEL, THE MINIMUM ACCIDENT RATE THAT WOULD HAVE TO BE OBSERVED TO ASSURE THAN AN ESTABLISHED CRITICAL ACCIDENT RATE WAS, IN FACT, EXCEEDED, AND THE AMOUNT OF REDUCTION IN THE NUMBER OF ACCIDENTS THAT WOULD HAVE TO BE EXPERIENCED BEFORE IT COULD BE CONCLUDED THAT A SAFETY IMPROVEMENT PROJECT WAS DEFINITELY AN IMPROVEMENT.

• Record URL:
  • http://onlinepubs.trb.org/Onlinepubs/hrr/1967/188/188-005.pdf
• Supplemental Notes:
  • Paper sponsored by Committee on Highway Safety and presented at the 46th Annual Meeting. 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
• Authors:
  • Morin, Donald A
• Publication Date: 1967

Media Info

• Media Type: Print
• Features: Appendices; Figures; References; Tables;
• Pagination: pp 72-79
• Monograph Title: Traffic accident research
• Serial:
  • Highway Research Record
  • Issue Number: 188
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Crash rates; Statistical analysis; Traffic crashes; Vehicle miles of travel
• Uncontrolled Terms: Data; Interpretation
• Subject Areas: Data and Information Technology; Highways; Safety and Human Factors;

Filing Info

• Accession Number: 00219878
• Record Type: Publication
• Report/Paper Numbers: HS-000 708
• Files: TRIS, TRB
• Created Date: Nov 26 1994 12:00AM