THE SIMULATION OF ORGANISED CAR SHARING. 1. THE SYNTHESIS OF A POPULATION BASE

This working paper is one of a series describing the methods and findings of a TRRL sponsored project to simulate organised car sharing schemes. This volume describes the generation of a population base on which the simulation is to proceed. The synthesised population numbers 180000 persons and represents all residents of West Yorkshire who make a work trip into Greater Leeds during the peak period. It must be appreciated, however, that it is the prime aim of the model to generate a population of individuals to serve as actors within a simulation model not to replicate the population of West Yorkshire. The synthesis of personal characteristics, modal choice and micro location of trip ends was achieved by a series of probability models. These probabilities were, with the exception of those relating to trip distribution, derived by straightforward category summation in our data base. The trip distribution probabilities were produced via a calibrated doubly constrained entropy maximising model for 44 categories of trip maker. Synthesis of micro location of trip ends was achieved by probabilistic sampling from a geometric rendering of settlement patterns within zones. Data for the calibration of these models was taken from the 1971 census of workplace location, the 1971 population census and the 1975 Wytconsult household interview survey. This report presents an analysis of the performance of the synthesis models and includes criticism of the techniques used.(a) (TRRL)

  • Corporate Authors:

    University of Leeds

    School of Geography, Woodhouse Lane
    Leeds, West Yorkshire  England  LS2 9JT
  • Authors:
    • BONSALL, P W
    • Champernowne, A F
  • Publication Date: 1979-3

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 68 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00319551
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Report/Paper Numbers: Working Paper 107 Monograph
  • Files: ITRD, TRIS, ATRI
  • Created Date: Feb 6 1981 12:00AM