The basic characteristics of highway maintenance and their effect on the location, number, and size of maintenance yards were analyzed. The study dealt exclusively with the management unit that is directly responsible for all maintenance operations in a given area where all activities initiate and terminate at the yards on a daily basis. The yards were assumed to be of unlimited capacity and used for storage of materials and equipment. Variable cost functions for maintenance travel and maintenance yards were developed analytically for the special case of an unbounded area with uniform distribution of maintenance requirements. Both functions were found to be nonlinear and unimodal with respect to travel time. They also showed that travel time, used as a measure of distance, and a limit on daily work hours were the most critical factors in the maintenance yard problem. In the optimization process, a new, unique criterion was established. For any potential yard site, there existed a specific maximum travel time that defined the conditions for minimizing the variable unit maintenance cost for any and all maintenance requirements served by that site. Furthermore, it was proved that optimization results based on either this criterion or total variable cost for the total given area were the same. It was also found that the "fixed" maintenance requirement of any highway segment was a variable that depended on travel time between the segment and the yard serving it. Similar cost functions were developed for general case of highway maintenance in a bounded area that has nonuniform and discrete maintenance requirements. The use of travel time as a measure of distance showed that the maintenance yard problem was independent of boundary conditions. Use of the new optimization criterion for individual yard sites also made the problem independent of the magnitude of the bounded area. /Author/

Media Info

  • Media Type: Print
  • Features: Figures; References;
  • Pagination: pp 22-30
  • Monograph Title: Maintenance decision making and energy use, roadside and pavement management, and preferential bridge icing
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00193676
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: May 11 1979 12:00AM