The common approach to road network trafficcontrol, top-down control by means of scenarios, ran into theproblem of too large a set of scenarios and the problem ofconflicts between scenarios from different traffic authorities(for motorways and for urban networks) in the same area.This became apparent around 2008 in the development ofnetwork management for the Amsterdam area. A tool calledScenario Coordination Module (SCM), intended to handle thesetwo problems, evolved into a network control system, doingcontrol at different levels in the network, in a way in whichglobal scenarios no longer play an important role. This system,still called by its now obsolete name, has been installed in theAmsterdam area and is worldwide among the first systemsfor network control in mixed networks. In this paper, we willpresent an approach combining multi-agent control and theSCM for a large scale road network.
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