Estimating Benefits from Specific Safety Improvements: Phase II - Safety Benefits of Intersection Approach Realignment

One task of a traffic safety engineer is to identify high accident locations and to design treatments for reducing the number of crashes. This process relies on the availability of accurate information on the crash reduction efficacy of the various treatments. Currently, most agencies rely for their prediction on crash reduction factors that were developed in the 1960's. It is necessary to update and reassess these factors using the new data and new evaluation methods. Currently the authors are conducting a before/after type study and using Empirical Bayes method to estimate crash reduction factors for modern conditions on two-lane rural highways. This paper reports on the results of the second phase of the study, which was aimed at evaluating the safety benefits of intersection approach realignment. Furthermore, Analysis of Variance model is used to identify the extra benefits of the comprehensive treatments. The research shows that the improvements studied appeared to reduce the total number of crashes, but the effect on different type of crashes is different. Also, combining realignment with adding a left-turn lane or traffic signal does not appear to offer significant additional benefits in crash reduction.

  • Record URL:
  • Corporate Authors:

    University of Connecticut, Storrs

    Connecticut Transportation Institute
    179 Middle Turnpike
    Storrs, CT  United States  06269-5202

    Connecticut Department of Transportation

    280 West Street
    Rocky Hill, CT  United States  06067
  • Authors:
    • Yuan, Fei
    • Ivan, John
    • Garrick, Norman
    • Davis, Christian
  • Publication Date: 2000-12


  • English

Media Info

  • Media Type: Web
  • Edition: Final Report
  • Features: Figures; References; Tables;
  • Pagination: 31p

Subject/Index Terms

Filing Info

  • Accession Number: 01005999
  • Record Type: Publication
  • Report/Paper Numbers: JHR 00-281, Project 97-1(2)
  • Created Date: Oct 10 2005 2:03PM