ESTIMATION OF ORIGIN-DESTINATION TRIP-TABLES BASED ON A PARTIAL SET OF TRAFFIC LINK VOLUMES

Conventional survey techniques for origin-destination (OD) can be costly and time-consuming, so models are being developed that can inexpensively estimate these flows from easily available traffic link volumes. This paper develops one such approach for synthesizing OD flows based on only a partial set of link volume information. This consideration introduces nonlinearities in the cost function of the model because of the dependence of link travel costs on link volumes, and requires the determination of a fixed-point (rather than an optimal) solution to the proposed model. Such a fixed point is determined heuristically by iteratively approximating the nonlinear model using a sequence of linear programs. The method is evaluated using three sample networks from the literature. Computational results show a favorable competitive advantage for the proposed approach over the frequently-used maximum entropy approach. The proposed approach is shown to robustly replicate a consistent set of observed volumes while attempting to prescribe flows that conform with user-equilibrium principles. The preliminary results indicate that this approach exhibits potential viability.

Language

  • English

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Filing Info

  • Accession Number: 00963310
  • Record Type: Publication
  • Files: TRIS, ATRI
  • Created Date: Sep 8 2003 12:00AM