Intelligent Transportation Systems (ITS) are being developed to provide real-time control and route guidance to motorists to optimize the urban traffic network performance. The two primary components of such systems consist of a Dynamic Traffic Assignment (DTA) model to predict future traffic conditions and a Real Time Traffic Adaptive Control System (RT-TRACS) for the generation of signal control strategies.
This paper addresses the problem how to combine these models into an integrated system. The proposed approaches (there are multiple such approaches discussed in the paper) consist of an integration of the different levels of the RTTRACS hierarchy with the predictive ability of dynamic traffic assignment. The approaches are sufficiently practical so that they can be implemented in an urban area with existing centralized traffic control equipment and operating software.