IDEAS home Printed from https://ideas.repec.org/
MyIDEAS: Login to save this article or follow this journal

Comparing the speed-flow relationship for motorways with new data from the M6

  • Smith, W. Spencer
  • Hall, Fred L.
  • Montgomery, Frank O.
Registered author(s):

    This paper draws on data collected in March 1993 from the M6 motorway north of Birmingham, England, to discuss the speed-flow relationships used in cost benefit analysis. Piece-wise linear functions have been fitted to the M6 data, and are then compared to the relationships in the U.K. Cost Benefit Analysis Manual (COBA9: U.K. Department of Transport, 1981), and the U.S. Highway Capacity Manual (HCM: U.S. Transpn Res Bd, 1994). The results provide clear support for the value of 1200 v/h/l used in COBA9 as the flow at which speeds start to decrease more rapidly, but in other respects the results differ from values in both COBA9 and the HCM. In comparison with the observed data, COBA9 estimates: a lower speed at a flow of 1200 v/h/l; a steeper slope at higher flows; a higher capacity flow; and a lower speed at capacity. Equivalently, HCM estimates: a gentler slope at higher flows; a higher capacity flow; and a higher speed at capacity. Thus the high-flow data fall somewhere between the COBA9 and HCM estimates.

    If you experience problems downloading a file, check if you have the proper application to view it first. In case of further problems read the IDEAS help page. Note that these files are not on the IDEAS site. Please be patient as the files may be large.

    File URL: http://www.sciencedirect.com/science/article/B6VG7-3VW1BY8-1/2/b2e568a280c9e8d8b79d6071fef0fa3c
    Download Restriction: Full text for ScienceDirect subscribers only

    As the access to this document is restricted, you may want to look for a different version under "Related research" (further below) or search for a different version of it.

    Article provided by Elsevier in its journal Transportation Research Part A: Policy and Practice.

    Volume (Year): 30 (1996)
    Issue (Month): 2 (March)
    Pages: 89-101

    as
    in new window

    Handle: RePEc:eee:transa:v:30:y:1996:i:2:p:89-101
    Contact details of provider: Web page: http://www.elsevier.com/wps/find/journaldescription.cws_home/547/description#description

    Order Information: Postal: http://www.elsevier.com/wps/find/supportfaq.cws_home/regional
    Web: https://shop.elsevier.com/order?id=547&ref=547_01_ooc_1&version=01

    No references listed on IDEAS
    You can help add them by filling out this form.

    This item is not listed on Wikipedia, on a reading list or among the top items on IDEAS.

    When requesting a correction, please mention this item's handle: RePEc:eee:transa:v:30:y:1996:i:2:p:89-101. See general information about how to correct material in RePEc.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: (Zhang, Lei)

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    If references are entirely missing, you can add them using this form.

    If the full references list an item that is present in RePEc, but the system did not link to it, you can help with this form.

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your profile, as there may be some citations waiting for confirmation.

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    This information is provided to you by IDEAS at the Research Division of the Federal Reserve Bank of St. Louis using RePEc data.