VARIATIONS IN QUEUE DISCHARGE PATTERNS AND THEIR IMPLICATIONS IN ANALYSIS OF SIGNALIZED INTERSECTIONS

Saturation flow is traditionally treated as a stabilized maximum rate at which queuing vehicles can be discharged from a lane after the signal changes to green. Traffic engineers in many countries have been using this parameter to estimate the capacities of traffic lanes at signalized intersections. The estimated capacities in turn are used to estimate other performance measures and to classify levels of service. This traditional method of analysis is an efficient way for capacity estimation if the queue discharge rate rises quickly to a steady maximum after onset of the green signal. Actual queue discharge patterns, however, often do not display an easily identifiable steady maximum rate. This characteristic renders the use of saturation flow troublesome and prone to errors that can lead to poor planning and operational decisions. The pitfalls in the current use of saturation flow are examined, and ways of alleviating the problems are suggested.

• Record URL:
  https://doi.org/10.3141/1883-22
• Summary URL:
  http://scholar.google.com/scholar_lookup?title=VARIATIONS+IN+QUEUE+DISCHARGE+PATTERNS+AND+THEIR+IMPLICATIONS+IN+ANALYSIS+OF+SIGNALIZED+INTERSECTIONS&author=F.+LIN&author=P.+Tseng&author=C.+Su&publication_year=2004
• Availability:
  • Find a library where document is available. Order URL: http://www.trb.org/Main/Public/Blurbs/155481.aspx
• Supplemental Notes:
  • This paper appears in Transportation Research Record No. 1883, Traffic Flow Theory and Highway Capacity and Quality of Service 2004.
• Corporate Authors:

  Transportation Research Board

  500 Fifth Street, NW
  Washington, DC  United States  20001
• Authors:
  • LIN, F-B
  • Tseng, P-Y
  • Su, C-W
• Publication Date: 2004

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 192-197
• Monograph Title: TRAFFIC FLOW THEORY AND HIGHWAY CAPACITY AND QUALITY OF SERVICE 2004
• Serial:
  • Transportation Research Record
  • Issue Number: 1883
  • Publisher: Transportation Research Board
  • ISSN: 0361-1981

Subject/Index Terms

• TRT Terms: Highway capacity; Level of service; Saturation flow; Signalized intersections; Traffic lanes; Traffic queuing
• Uncontrolled Terms: Queue discharge patterns
• Subject Areas: Highways; Operations and Traffic Management; I71: Traffic Theory;

Filing Info

• Accession Number: 00983374
• Record Type: Publication
• ISBN: 030909478X
• Files: TRIS, TRB, ATRI
• Created Date: Dec 21 2004 12:00AM