An algorithm for real-time sub-optimal control of critical intersections is developed. The algorithm minimises total intersection delays subject to queue length constraints. If minimisation of delays is the only objective demand predictions are not needed, and the control strategy can easily be determined from the state of only one queue which can easily be sampled on a real-time basis. Utilisation of a more realistic input-output model results in a control policy which is not necessarily bang-bang. When constraints are placed on the queues demand predictions are needed, but only for one cycle ahead of time rather than long time-spans. Sub-optimal policies are also developed if the solution is outside of the admissible control domain. Unlike most previously-developed policies the results presented here are applicable to two-way streets and multiphase signals. Furthermore, determination of the control policy requires only conventional traffic parameters that are either known a priori or are easily estimated on real time. Numerical examples are presented and the superiority of the control policy is clearly demonstrated.(a) /TRRL/

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  • Corporate Authors:

    Printerhall Limited

    29 Newmart Street
    London W1P 3PE,   England 
  • Authors:
    • Michalopoulos, P G
    • Stephanopoulos, G
  • Publication Date: 1979-1

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Filing Info

  • Accession Number: 00194454
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD, TRIS
  • Created Date: Jun 13 1979 12:00AM