ANALYTICAL WARRANT FOR SEPARATE LEFT-TURN PHASING (ABRIDGMENT)

The development of a new volume warrant for left-turn phasing at signalized intersections is presented. The concept is to maintain a fixed volume-to-capacity (V/C) ratio for all intersection movements. Thus left-turn phasing would be warranted when the unprotected left-turn V/C ratio exceeds that of through traffic. Left-turn capacity is derived from formulas in the Highway Capacity Manual and the Australian Road Research Board Capacity Manual. The warrant also combines both signal-timing and capacity-analysis procedures. The proposed warrant has been compared with other methods found in the literature and the results are, in general, favorable. This study is preliminary in nature; its scope is limited to four-legged intersections with one through lane and an exclusive left-turn lane of adequate length on all approaches. No adjustments for trucks, buses, or pedestrian interference are considered. Finally, it is understood that traffic signal parameters are selected according to Webster's optimum settings for fixed-time signals.

• Record URL:
  • http://onlinepubs.trb.org/Onlinepubs/trr/1986/1069/1069-004.pdf
• Summary URL:
  • https://scholar.google.com/scholar_lookup?title=ANALYTICAL+WARRANT+FOR+SEPARATE+LEFT-TURN+PHASING+(ABRIDGMENT)&author=N.+Rouphail&publication_year=1986
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/0309040639
• Supplemental Notes:
  • Publication of this paper sponsored by Committee on Traffic Control Devices. Publication of this paper sponsored by Committee on Traffic Control Devices. 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:
  • Rouphail, Nagui M
• Publication Date: 1986

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 20-24
• Monograph Title: TRAFFIC CONTROL DEVICES AND RAIL-HIGHWAY CROSSINGS
• Serial:
  • Transportation Research Record
  • Issue Number: 1069
  • Publisher: Transportation Research Board
  • ISSN: 0361-1981

Subject/Index Terms

• TRT Terms: Highway capacity; Left turn phase; Ratios; Traffic control warrant; Traffic volume
• Old TRIS Terms: Left turn phasing; Traffic warrants
• Subject Areas: Highways; Operations and Traffic Management; I73: Traffic Control;

Filing Info

• Accession Number: 00474249
• Record Type: Publication
• ISBN: 0-309-04063-9
• Report/Paper Numbers: HS-040 094
• Files: HSL, TRIS, TRB
• Created Date: Oct 31 1990 12:00AM