OPTIMIZING URBAN MASS TRANSIT SYSTEMS: A GENERAL MODEL

This paper describes a model for determining the general dimensions of an optimal mass transit system for an idealized urban area. The model is based on a circular city with a definite center and with density declining uniformly form the center in all directions according to the negative exponential function. The transit system consists of radial routes that emanate from the center and contain descrete stops. Only trips to or from the center are considered, and travel is assumed to occur only in radial and circumferential directions. The model represents total community costs of the system, defined to include travel time, operating costs, equipment, and construction. A recursive procedure was devised to find a simultaneous minimum with respect to the spacing of routes, number and spacing of stops on each route, and average headway. Numerical analyses were conducted for six hypothetical cities by using varying values for the parameters of the density function. In each case, three types of transit systems were compared: conventional bus service, buses on exclusive lanes, and rail rapid transit. The optimal system in the largest city examined was exclusive bus lanes; in the other five cases, the optimal system was conventional bus service. Other interesting relations that appeared in the results are summarized. /Author/

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 41-47
  • Monograph Title: Transportation system analysis
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00195969
  • Record Type: Publication
  • ISBN: 0309028221
  • Files: TRIS, TRB
  • Created Date: Sep 15 1981 12:00AM