The Nevada Department of Transportation (NDOT) is developing a network optimization system (NOS). The objective of the system is to evaluate various alternatives and to recommend the most cost-effective rehabilitation treatment to be used on the various sections of the state highway system. The NOS consists of several subsystems, including performance models, life-cycle cost analysis, and network optimization. Performance models have been developed for the rehabilitation treatments most commonly used by NDOT: overlay and mill/overlay. The performance models were developed on the basis of the pavement management system data that have been collected by NDOT for the last 15 years. The models were generated through statistical analyses that related the present serviceability index to age, traffic, environment, and structural and materials properties. First cost and annual maintenance cost figures were established to be used in the life-cycle cost analysis. The annual maintenance costs proved to be the most difficult figures to estimate due to the extremely large variability. After several attempts, the fixed period cumulative cost approach was identified as the best alternative to reducing the variability of the annual maintenance costs. In order to accomplish true network optimization, the entire NDOT highway system was subdivided into project segments (total number of segments is in excess of 800). Several databases were formed to house the data corresponding to each project segment. The NOS will use the performance models in conjunction with the supporting databases to conduct a fully automated optimization analysis.


  • English

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 215-222
  • Serial:

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Filing Info

  • Accession Number: 00780247
  • Record Type: Publication
  • ISBN: 0309071097
  • Files: TRIS, TRB, ATRI
  • Created Date: Dec 13 1999 12:00AM