Controlled Optimization of Phases at an Intersection

Suvrajeet Sen and K. Larry Head
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Suvrajeet Sen: SIE Dept. of University of Arizona, Tucson, Arizona 85721
K. Larry Head: SIE Dept. of University of Arizona, Tucson, Arizona 85721

Transportation Science, 1997, vol. 31, issue 1, 5-17

Abstract: This paper presents a general purpose algorithm for real-time traffic control at an intersection. Our methodology, based on dynamic programming, allows optimization of a variety of performance indices such as delay, stops and queue lengths. Furthermore, optimal phase sequencing is a direct by-product of this new approach. These features make the new methodology a powerful tool for intersection control. We demonstrate the usefulness of the approach by a simulation experiment in which our intersection control algorithm is interfaced with a well established simulation package called TRAF-NETSIM. Our study compares the controlled optimization of phases methodology with fully-actuated as well as semi-actuated control. We show that consistent reductions in delay may be possible by adopting the new algorithm.

Date: 1997
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