This paper presents a model for estimating the mean annual roughness of an unsealed road in New Zealand. Unlike either sealed or paved surfaces, the roughness of unsealed roads is subject to abrupt changes due to climate, traffic and maintenance activities. So a single observation does not represent condition as experienced by traffic; a minimum of about six sets of observations taken at intervals over a twelve month period will be needed to provide a good estimate of the state that affects traffic. Between 1985 and 1990, a number of unsealed roads in different parts of New Zealand were monitored for roughness and other particulars over a period of not less than 12 months. This paper has aggregated data from these individualresearch reports to produce a model. The model can provide help for asset managers who operate on a steady state and constant maintenance philosophy. Future extension obtained by adding data from areas currently excluded, should be of value in order both to reinforce and broaden the applicability of the model. (a) For the covering entry for this conference see IRRD abstract no 861445.


  • English

Media Info

  • Features: References;
  • Pagination: p. 145-53

Subject/Index Terms

Filing Info

  • Accession Number: 00674633
  • Record Type: Publication
  • Source Agency: ARRB
  • ISBN: 0-478-04149-7
  • Files: ITRD, ATRI
  • Created Date: Mar 8 1995 12:00AM