This document has focused on expressing the fundamental need, common to all countries, to act on dangerous sites (referred to by the scientific literature with a myriad of terms), and precisely in this sense, to develop policies aimed at the proper implementation of road safety management systems (both in the design phase and in the operation phase, as stated in such important framework documents as the European Directive 2019/1936). The objective is clear: work must be done to achieve the Safe System concept, in which road engineers ensure that the road network has been designed and maintained from a safety perspective. It is hoped that this document will be useful not only for its informative nature, but also for its practical character, since it can serve as a reference for all the actors who decide to face the problem of accidents from the point of view of the management of dangerous sites, thanks to the adoption of successful strategies and the possibility of "avoiding" the mistakes learned from experience.