THE EVALUATION OF BENEFITS IN CONSTRAINED AND CONGESTED SITUATIONS

Strategic-level transport models such as the London LTS are constructed to take account of road and rail congestion and often additionally assume doubly-constrained trip ends. In these circumstances the use of the traditional benefit formulae can lead to severe anomalies. A simple example of this occurs when easier travel into (but not out of) a district forces those living there to make longer journies than before without themselves receiving any increased benefit. Current practice can attribute more benefit to these 'unwilling' travellers than to those genuinely advantaged by the changes. A new formula is proposed which takes better account of the constraints experienced by travellers in such situations. It is designed not only to be compatible with existing evaluations in unconstrained situations, but also to reflect common-sense expectations in more complex cases. Since it is based on accessibilities this system has the additional advantage of being location- rather than person-based, and thus offers the prospect of coping more helpfully with cases of population change.

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  • Corporate Authors:

    Printerhall Limited

    29 Newmart Street
    London W1P 3PE,   England 
  • Authors:
    • BEARDWOOD, J E
  • Publication Date: 1990-4

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Filing Info

  • Accession Number: 00497042
  • Record Type: Publication
  • Files: TRIS, ATRI
  • Created Date: Sep 30 1990 12:00AM