RESEARCH PROGRAMME MEASURES THE VARIABILITY OF URBAN JOURNEY TIMES

This article reports research results on the modelling and evaluation of journey time variability (JTV) with the aim of revealing the factors underlying the relationship between JTV, journey length and congestion. Earlier research in the city of London, UK, was compared to recent, more wide-ranging research carried out in the city of Leeds. The London study considered only the morning peak period while the Leeds project covered the whole day. Statistics of mean journey time, standard deviation and coefficient of variation were compared. An equation was devised relating the coefficient of variation to journey time, free flow journey time and journey distance. This could be used to estimate the user benefits of changes to journey time reliability. Caution would need to be exercised, however, in using the recommended equation in different locations.

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  • Corporate Authors:

    Hemming Group, Limited

    32 Vauxhall Bridge Road
    London,   United Kingdom  SW1V 2SS
  • Authors:
    • Black, I
    • BATES, J
    • Fearon, J
    • Gilliam, C
    • KERR, A
    • PORTER, S
  • Publication Date: 2004-12

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00988557
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD, ATRI
  • Created Date: Apr 4 2005 12:00AM