Traffic Signal Splits Optimisation in Real Time: The Simplex Algorithm in SCATS

The objective of adaptive traffic signal control systems is to optimise traffic flow. This is typically achieved by optimising intersection cycle length, phase splits and cycle offsets. In real-time systems, a compromise between optimal and computable solutions is often achieved. Phase split optimisation for trivial intersection problems are solved via efficient and ordinary optimisation techniques. Realistic and practical intersections contain phases with overlapping movements which require more sophisticated constrained optimisation techniques. This paper presents a novel application of the Simplex algorithm that increases the number of cases for which an optimal solution for phase splits can be found while maintaining its real-time computability. This strategy increases the number of phases that can be optimised in Sydney Coordinated Adaptive Traffic System (SCATS) and enables traffic operators to choose the algorithm responsiveness.

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  • Supplemental Notes:
    • Abstracts used with permission of ERTICO – ITS Europe.
  • Corporate Authors:

    ERTICO - ITS Europe

    Avenue Louise 326, Blue Tower, 2nd Floor
    Brussels,   Belgium  B-1050
  • Authors:
    • Aydos, J Carlos
    • Shaw, Steven
    • Mehaffey, Andrew
  • Conference:
  • Publication Date: 2015


  • English

Media Info

  • Media Type: Digital/other
  • Features: Figures; References;
  • Pagination: 12p
  • Monograph Title: 22nd ITS World Congress. Proceedings

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Filing Info

  • Accession Number: 01603771
  • Record Type: Publication
  • Report/Paper Numbers: ITS-1644
  • Files: TRIS
  • Created Date: Jun 28 2016 10:36AM