SIGOP II: A NEW COMPUTER PROGRAM FOR CALCULATING OPTIMAL SIGNAL TIMING PATTERNS

This paper describes a new signal timing optimization program, SIGOP II. The optimization procedure consists of two major components: a flow model and an optimization methodology. The objective function of system disutility is expressed directly in terms of vehicle delay, stops, and excess queue length (a congestion deterrent). The flow model computes these components of disutility in the course of the optimization procedure. The optimization procedure uses the method of successive approximations within the framework of a dynamic programming methodology. Gradient techniques are applied to explore a response surface representing system disutility and to locate the minimum value. Associated with this minimum value of disutility is the optimal signal setting sought by the optimization procedure. The platoon structure of traffic and its interaction with the control at the intersection are described. Continuity of flow is preserved from one link to the next. Turning movements, lane channelization, and multiphase control are explicity treated. Practical considerations such as signal split constraints, platoon dispersion, and the effect of short-term fluctuations in volume are included. This program, coded in FORTRAN, is currently being refined and extended. A comparison of SIGOP I and SIGOP II is given.

• Record URL:
  http://onlinepubs.trb.org/Onlinepubs/trr/1976/596/596-004.pdf
• Summary URL:
  http://scholar.google.com/scholar_lookup?title=SIGOP+II%3a+A+NEW+COMPUTER+PROGRAM+FOR+CALCULATING+OPTIMAL+SIGNAL+TIMING+PATTERNS&author=E.+Lieberman&author=J.+Woo&publication_year=1976
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/03611981
• Supplemental Notes:
  • Publication of this paper sponsored by Committee on Traffic Flow Theory and Characteristics. 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:
  • Lieberman, Edward B
  • Woo, James L
• Publication Date: 1976

Media Info

• Media Type: Digital/other
• Features: Figures; References; Tables;
• Pagination: pp 16-21
• Monograph Title: Flow theory
• Serial:
  • Transportation Research Record
  • Issue Number: 596
  • Publisher: Transportation Research Board
  • ISSN: 0361-1981

Subject/Index Terms

• TRT Terms: Computer programs; Dynamic programming; Mathematical models; Optimization; Traffic flow; Traffic platooning; Traffic signal timing
• Uncontrolled Terms: Disutility; Models
• Old TRIS Terms: Sigop
• Subject Areas: Highways; Operations and Traffic Management;

Filing Info

• Accession Number: 00149115
• Record Type: Publication
• ISBN: 0309025656
• Files: TRIS, TRB
• Created Date: Apr 13 1977 12:00AM