This is a data exploratory report. It is the first in a planned series of three Traffic Research Reports, all oriented towards estimating the effects of a reduction in the frequency of vehicle inspection. Written records of 21,229 Warrant of Fitness Inspections of private cars were analysed. Most (16,530) of the inspections were made at Levin over a 13 month period. This report explains in detail how the study was conducted. Some basic methodologies have been developed for use in later papers. The analysis suggested that large increases in the failure rates will occur if the inspection frequency for vehicles of any age is changed from once every six months to once yearly. Since the benefits for gone by altering the inspection frequency are very difficult to quantify in absolute terms, the findings of this study have not produced optimal inspection intervals. Three scenarios were examined, representing progressively more benefit lost per unit cost saved. An attempt was made to quantify the relationship between the diagnoses made by the automotive surveyors and the relative probability of injury accident involvement (roadworthiness score). The implications of three or four scenarios in terms of safety and cost benefit will be explored further in future papers.

  • Corporate Authors:

    Ministry of Transport, New Zealand

    Road Transport Division, Private Bag
    Wellington,   New Zealand 
  • Authors:
    • WHITE, W T
  • Publication Date: 1984-4

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: 79 p.
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00395978
  • Record Type: Publication
  • Source Agency: National Highway Traffic Safety Administration
  • Report/Paper Numbers: HS-038 183
  • Files: HSL, ATRI, USDOT
  • Created Date: Jul 31 1985 12:00AM