This paper argues that the attribution of specific levels of trip generation and trip attraction to zones on the basis of their physical development and their socio-economic character is manifestly impossible; what may legitimately be inferred from such data is a quantity representing what the number of trips produced by a zone would be if its accessibility had a certain constant value. (this quantity is termed the zone's trip-producing "propensity".) The gravity model can then be used to perform trip generation and distribution simultaneously. An appended section on economic evaluation and generated travel illustrates two approaches to economic evaluation and the use of alternative definitions of user benefit, and demonstrates the very different results obtained by incorporating the gravity model for generation and distribution of trips; the conclusion, not very surprisingly, is that the measurement of user benefit needs much more study. /Author/

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  • Corporate Authors:

    Printerhall Limited

    29 Newmart Street
    London W1P 3PE,   England 
  • Authors:
    • Singer, EHE
  • Publication Date: 1973-12

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Filing Info

  • Accession Number: 00262605
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Jan 9 1975 12:00AM