Highway improvement projects are generally aimed at alleviating highway deficiencies related to traffic flow, congestion, and safety. Although significant effort is expended in developing and implementing the most appropriate countermeasures for specific deficiencies, not enough work is undertaken by highway agencies to evaluate the impact of such improvements. The evaluation of implemented projects is critical in determining future courses of action for the agencies regarding specific countermeasures related to individual problems. Although statistical methods of analysis using Poisson and chi-square distributions have been in existence, they are neither suitable for locations with very low accident frequency nor responsive to local conditions or standards. This paper offers an alternative procedure-quality-control technique-that overcomes the shortcomings of the other methods and offers the advantages of performing parametric comparisons by facility type or improvement type utilizing various measures of effectiveness. This procedure can also be adapted for identification of safety deficient locations. Parametric controls charts required for this procedure can be readily prepared by computer or manual methods from existing data for various facility types. /Author/

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 9-16
  • Monograph Title: Accident analysis, ride quality, driver education, and behaviour research
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00194268
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Jun 13 1979 12:00AM