Sustainable development is one of the major challenges of the 21st century. Faced with the growing demand for both passenger and goods mobility, present-day societies have to develop concrete solutions to control the social, economic and environmental impacts of this increasing demand.
One solution lies in the dynamic real-time management of transportation flows typically generated in large urban built-up areas. It relies on the great technological progress achieved over the past decade in the collection and real-time transmission of information. As a result, it is now possible to have very precise data on trips made in a given territory over a space-time continuum. This allows the implementation of effective management measures to reduce for example the adverse effects of congestion (pollution, road safety problems, and considerable social impact) in a defined area.
One such measure consists in installing dynamic information signs at the entries of built-up areas to inform road users of congestion risks and available alternatives. These signs also enhance the safety of road users by displaying information on problem areas, and possibly on the type of incident they may meet, in real time.
This paper first reviews a few technological tools presently available to transmit data on traffic conditions. Secondly, a methodology of dynamic mobility and safety management, as implemented for the city of Brussels in Belgium, is presented. This methodology makes use of variable message signs installed along the major radial roads converging to the town centre.
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