Real-time traffic management or short-term prediction?

Traffic Technology International, Nov 2018: Given the many real-time adaptive traffic management systems already in operation, why do we need short-term prediction, decision support systems and predictive modeling?
San Diego: Integrated Corridor Management System

Aimsun Live forecasts and simulates congestion and capacity imbalances in real time for SANDAG’s award-winning ICMS on I-15.