Speed-Flow Curves for Freeways in the HCM: A Historical Perspective

As the new 2010 Highway Capacity Manual (HCM) approaches, an understanding of the history of speed-flow curves is useful in understanding the manual's new curves and their implications. This paper reviews that history, from the 1950 HCM through the current 2000 edition. The paper reviews both the data sources and judgments that were involved in their development.

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  • Supplemental Notes:
    • The DVD lists the title of this paper as: Speed-Flow Curves for Freeways in the Highway Capacity Manual: Historical Perspective.
  • Corporate Authors:

    Transportation Research Board

    500 Fifth Street, NW
    Washington, DC  USA  20001
  • Authors:
    • Roess, Roger P
  • Conference:
    • Transportation Research Board 90th Annual Meeting
  • Publication Date: 2011


  • English

Media Info

  • Media Type: DVD
  • Features: Figures; References;
  • Pagination: 14p
  • Monograph Title: TRB 90th Annual Meeting Compendium of Papers DVD

Subject/Index Terms

Filing Info

  • Accession Number: 01336846
  • Record Type: Publication
  • Report/Paper Numbers: 11-0542
  • Files: TRIS, TRB
  • Created Date: Feb 17 2011 5:29PM