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Talking about road safety, one of the major limitations for Traffic Management Centres when publishing events to driver applications, is the speed reduction that they should apply in the presence of those traffic incidences. The intensity or strength, and the environment conditions where these incidences arise, play a critical role for the percentage of speed reduction that should be applied. In general, speed limits, drivers behaviour and traffic conditions, vary greatly among cities. Defining consistent rules based on the particular conditions of cities, is key for Traffic Management Centres in order to provide reasonable speed recommendation to drivers, that can increase road safety. In accordance with what has been analyzed in this publication, the most important conclusion drawn by this study is that it is possible to provide to the city Traffic Management Centres dynamic speed limits information based on real-time incidents.