A novel traffic signal control formulation

A novel traffic signal control formulation

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Article ID: iaor20001915
Country: United Kingdom
Volume: 33A
Issue: 6
Start Page Number: 433
End Page Number: 448
Publication Date: Aug 1999
Journal: Transportation Research. Part A, Policy and Practice
Authors:
Keywords: transportation: road
Abstract:

A novel traffic signal control formulation is developed through a mixed integer programming technique. The formulation considers dynamic traffic, uses dynamic traffic demand as input, and takes advantage of a convergent numerical approximation to the hydrodynamic model of traffic flow. As inherent from the underlying hydrodynamic model, this formulation covers the whole range of the fundamental relationships between speed, flow, and density, Kinematic waves of the stop-and-go traffic associated with traffic signals are also captured. Because of this property, one does not need to tune or switch the model for the different traffic conditions. It ‘automatically’ adjusts to the different traffic conditions. We applied the model to three demand scenarios in a simple network. The results seemed promising. This model produced timing plans that are consistent with models that work for unsaturated conditions. In gridlock conditions, it produced a timing plan that was better than conventional queue management practices.

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