A hierarchical ramp metering control scheme for freeway networksA hierarchical ramp metering control scheme for freeway networks Πλήρης Δημοσίευση σε Συνέδριο Conference Full Paper 2015-11-202005enA nonlinear model-predictive control approach to the problem of coordinated ramp metering is presented. The previously designed optimal control tool AMOC is used within the framework of a hierarchical control structure which consists of three control layers: the estimation/prediction layer, the optimization layer and the direct control layer. More emphasis is given to the last two layers where the control actions on a network-wide and on a local level, respectively, are decided. The hierarchical control strategy combines AMOC's coordinated ramp metering control with local feedback (ALINEA) control in an efficient way. Simulation investigations for the Amsterdam ring-road are reported whereby the results are compared with those obtained by applying ALINEA as a stand-alone strategy. It is demonstrated that the proposed control scheme is efficient, fair and real-time feasible.http://creativecommons.org/licenses/by/4.0/2257 - 2262American Control Conference, 2005. Proceedings of the 2005American Control Conference, 2005. Proceedings of the 2005 Kotsialos, A Papageorgiou Markos Παπαγεωργιου Μαρκος Institute of Electrical and Electronics Engineers