A real time control policy minimizing total intersection delays subject to queue length constraints at an isolated signalized intersection is developed in this paper. The policy is derived from a new traffic model which describes the simultaneous evolution of queue lengths of two conflicting traffic streams, controlled by a traffic light, in both time and space. The model is based on the examination of shock waves generated upstream of the stop lines by the intermittent service of traffic at the signal. The proposed policy was tested against the existing pre-timed control policy at a high volume intersection and it was found superior, especially when demands increase well above the saturation level.
Bibliographical noteFunding Information:
Acknowledgements--The authors would like to acknowledge financial support from the program of University Research of the U.S. Department of Transportation. The computer programming and part of the mathematical derivations were performed by Vijay Pisharody and K. Khakzadi who worked on this research project in their capacity as graduate research assistants.