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This paper describes an approach to road traffic management (TM) at the network level. The paper is based on the experiences with the HARS system in and around Alkmaar, The Netherlands. This system is meant to integrate the traffic management on the urban, provincial and motorway networks near Alkmaar. The approach consists of a combination of top-down, scenario-based TM and bottom-up TM, based on communicating network elements (road segments and junctions). The paper argues that both ways have capabilities and limitations and that the best results can be achieved in combining the two and in achieving synergy between them.

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