USE OF THREE-DIMENSIONAL CONJUGATE DIRECTIONS SEARCH METHOD TO IMPROVE TRANSYT-7F COMPUTATIONAL EFFICIENCY

A modification of the computer program TRANSYT-7F has been developed to reduce computational time and improve the performance index by using the conjugate directions search method in three dimensions. The original TRANSYT-7F uses the hill-climbing method to perform a two-step optimization. This type of optimizing procedure has been used in the TRANSYT program for many years, and even TRANSYT-7F's new version, 6.0, still applies the same algorithm. In this paper, a new search method is developed to obtain simultaneously the final cycle length, split, and offset. It is a one-step optimization algorithm. From tests of 21 cases on a PC/AT, this modified TRANSYT-7F reduces computational time significantly and improves the performance index slightly compared with the new TRANSYT-7F. It also allows the user to consider the spillover effect, perform arterial priority or link maximum-allowed delay, and fix the offsets for designated intersections. Currently, this program can be used not only as a detailed off-line signal-timing analysis tool but also as a part of computing software for four newly developed traffic control systems in Taiwan to generate on-line signal-timing plans.

• Record URL:
  • http://onlinepubs.trb.org/Onlinepubs/trr/1989/1225/1225-014.pdf
• Record URL:
  • https://scholar.google.com/scholar_lookup?title=USE+OF+THREE-DIMENSIONAL+CONJUGATE+DIRECTIONS+SEARCH+METHOD+TO+IMPROVE+TRANSYT-7F+COMPUTATIONAL+EFFICIENCY&author=H.+Tsay&author=K.+Wang&publication_year=1989
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/0309049520
• Supplemental Notes:
  • This paper appears in Transportation Research Record No. 1225, Highway Capacity, Flow Measurement, and Theory. 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:
  • Tsay, Huel-sheng
  • Wang, Kwo-Tsaur
• Publication Date: 1989

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 116-129
• Monograph Title: Highway capacity, flow measurement, and theory
• Serial:
  • Transportation Research Record
  • Issue Number: 1225
  • Publisher: Transportation Research Board
  • ISSN: 0361-1981

Subject/Index Terms

• TRT Terms: Algorithms; Computer programs; Mathematical models; Optimization; Traffic signal timing
• Uncontrolled Terms: Modifications
• Old TRIS Terms: Conjugate directions search method
• Subject Areas: Highways; Operations and Traffic Management; I71: Traffic Theory;

Filing Info

• Accession Number: 00494973
• Record Type: Publication
• ISBN: 0309049520
• Files: TRIS, TRB, ATRI
• Created Date: Jun 30 1990 12:00AM