Combined control and route assignment in traffic signal networks

A combined network model is presented which simultaneously accounts for both the route choices made by motorists and the desired signal controls to match these choices. Given travel demand data and network characteristics the model generates signal controls to optimize network performance and calculates the resulting traffic flows. This optimization model inherently reflects the mutual consistency between traffic flows and signal controls. The model is applicable to both fixed-time and demand-responsive signals. Iterative procedures can be applied to account for coordination of the signals.