A major component of the risk management policy of RATP is to identify, control and monitor the evolution of events that may be signs of severe incidents or accidents in the transport networks. For nearly ten years, using a statistical analysis model, the studies of the danger precursors of the RATP transport networks contribute to the periodical control and monitoring of events related to the safety. These studies generate recommendations which are systematically analysed within the transport networks’ safety committees. The purpose of these studies is to define a predictive function in order to forecast the danger precursors’ evolutions.