EFFECT OF ADVERSE WEATHER CONDITIONS ON SPEED-FLOW-OCCUPANCY RELATIONSHIPS

The effect of adverse weather conditions on the flow-occupancy and speed-flow relationships is studied. The data used in the analysis were obtained from the Queen Elizabeth Way Mississauga freeway traffic management system. Regression analyses were performed to select proper models representing the flow-occupancy and speed-flow relationship for uncongested operation. Then dummy variable multiple regression analysis techniques were used to test for significant differences in traffic operations between different weather conditions. It is concluded that adverse weather conditions reduce the slope of flow-occupancy function and cause a downward shift in the speed-flow function. Adverse weather conditions also reduce the maximum observed flow rates.

• Record URL:
  http://onlinepubs.trb.org/Onlinepubs/trr/1994/1457/1457-022.pdf
• Record URL:
  https://scholar.google.com/scholar_lookup?title=EFFECT+OF+ADVERSE+WEATHER+CONDITIONS+ON+SPEED-FLOW-OCCUPANCY+RELATIONSHIPS&author=A.+Ibrahim&author=F.+Hall&publication_year=1994
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/0309061008
• Supplemental Notes:
  • This paper appears in Transportation Research Record No. 1457, Part 2, Traffic Flow and Capacity. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved
• Authors:
  • Ibrahim, Amal T
  • Hall, Fred L.
• Publication Date: 1994

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 184-191
• Monograph Title: Part 1: 1994 TRB Distinguished Lecture, Adolf D May; Part 2: Traffic flow and capacity
• Serial:
  • Transportation Research Record
  • Issue Number: 1457
  • Publisher: Transportation Research Board
  • ISSN: 0361-1981

Subject/Index Terms

• TRT Terms: Freeway operations; Multiple regression analysis; Regression analysis; Traffic flow; Traffic speed; Weather conditions
• Uncontrolled Terms: Occupancy; Relationships
• Old TRIS Terms: Multiple regression
• Subject Areas: Data and Information Technology; Highways; Operations and Traffic Management; I71: Traffic Theory;

Filing Info

• Accession Number: 00677662
• Record Type: Publication
• ISBN: 0309061008
• Files: TRIS, TRB
• Created Date: May 12 1995 12:00AM