Demand for transport has been increasing rapidly in urban areas. Increasing capacity by further construction of road is no longer economic or acceptable by society. Traffic control and management systems aim at the efficient use of the existing road infrastructure. They have shown benefits in reducing trip times and externalities. A key requirement is their responsiveness to variations in traffic conditions and allowing the possibility of network managers to evaluate strategies to cope with these variations. Prediction of how the traffic flows will develop is essential to managing traffic and providing reliable driver information. This needs to be integrated in traffic control systems