FROM SINGLE-STAGE TO TWO-STAGE FACILITY LOCATION MODEL OF CONNECTICUT'S HIGHWAY MAINTENANCE SYSTEM

The development of two facility location models for use in optimizing the locations of maintenance facilities for the Connecticut Department of Transportation (ConnDOT) is described. In the ConnDOT system vehicles and other equipment are stored at 55 roadway garages and are maintained at 13 repair facilities. In the single-stage model the optimum number of repair facilities is sought without changing the existing configuration of 55 roadway garages. In the two-stage model the optimum numbers of both repair facilities and roadway garages are sought. In both cases the solutions are achieved by using a mixed-integer programming formulation. The objective is to minimize the sum of annual transportation costs plus annualized overhead and expansion costs while maintaining acceptable levels of service. On the basis of the results from the single-stage model and external considerations, two options were recommended to ConnDOT management. The first option closes three repair facilities with an estimated net present value of savings of $5.0 million. The second option closes two repair facilities and has an estimated net present value of savings of $3.1 million. In addition to an explanation of how the single-stage model is built on to attain the two-stage model, a detailed description of the data gathering required to achieve this extension is given.

Language

  • English

Media Info

  • Features: Figures; References;
  • Pagination: p. 11-18
  • Monograph Title: Maintenance of the highway infrastructure
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00670460
  • Record Type: Publication
  • ISBN: 0309055229
  • Files: TRIS, TRB
  • Created Date: Dec 23 1994 12:00AM