Speed–Flow Curves for Freeways in Highway Capacity Manual 2010
Since the 1965 edition of the Highway Capacity Manual (HCM), fundamental curves representing the relationship between speed and volume or flow rate have formed the basis of design and analysis methodologies for basic freeway segments and for uninterrupted flow segments of multilane highways. As the 2010 edition of the HCM was being developed, a new set of freeway speed–flow curves was recommended. Somewhat late in the development process, the recommended curves became controversial. This paper presents the recommended curves and the research behind them and the controversies that affected the outcome. A final set of curves for HCM 2010 was recommended on the basis of extensive comparative statistical analyses of a substantial database and on several conditions that the TRB Highway Capacity and Quality of Service Committee voted to impose on the curves characteristics. Recommendations for the future are made.
- Record URL:
- Summary URL:
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Availability:
- Find a library where document is available. Order URL: http://www.trb.org/Main/Blurbs/166654.aspx
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Authors:
- Roess, Roger P
- Publication Date: 2011
Language
- English
Media Info
- Media Type: Print
- Features: Figures; References; Tables;
- Pagination: pp 10-21
- Monograph Title: Highway Capacity and Quality of Service 2011
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Serial:
- Transportation Research Record: Journal of the Transportation Research Board
- Issue Number: 2257
- Publisher: Transportation Research Board
- ISSN: 0361-1981
Subject/Index Terms
- TRT Terms: Databases; Freeways; Highway capacity; Statistical analysis; Traffic flow rate; Traffic speed
- Identifier Terms: Highway Capacity Manual 2010
- Uncontrolled Terms: Speed flow curves
- Subject Areas: Highways; Operations and Traffic Management; I73: Traffic Control;
Filing Info
- Accession Number: 01336835
- Record Type: Publication
- ISBN: 9780309222938
- Report/Paper Numbers: 11-0543
- Files: TRIS, TRB, ATRI
- Created Date: Apr 18 2011 12:24PM