A linear discriminant function named the Driver Improvement Index, developed in previous research sponsored by the Pennsylvania Department of Transportation, was applied to a novel and expanded group of drivers to test its accuracy in classifying accident-involved versus non-accident-involved operators, using historical accident data. A superior level of accuracy for this instrument as compared to the number of points on a driver's record was clearly indicated, in terms of correct accident group classifications. Refinements to the instrument were suggested and also evaluated in this project. Driver improvement program treatments were developed, implemented, and evaluated in this research, targeted to three levels of demonstrated negligence (points). These interventions included an advisory/warning letter, a Special Written Point Examination, and a classroom exercise for small groups labeled Decisions for Safe Driving. While the letter achieved moderate effectiveness in violation reduction and the written examination achieved significant reductions in both accidents and violations, the class failed to demonstrate a benefit on either measure.

  • Corporate Authors:

    Ketron Division of the Bionetics Corporation

    350 Technology Drive, Suite 20
    Malvern, PA  United States  19355

    Pennsylvania Department of Transportation

    Office of Research and Special Studies, P.O. Box 2926
    Harrisburg, PA  United States  17120
  • Authors:
    • Staplin, Loren
    • Lococo, K
    • Knoebel, K
  • Publication Date: 1992-5


  • English

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: 240 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00624960
  • Record Type: Publication
  • Report/Paper Numbers: PA-91-021+85-05, K222-000
  • Created Date: Sep 18 1993 12:00AM