This memo presents the results of a study conducted in 5 hospitals with 1871 road-traumatized patients (July 2019-January 2020), showing that about 10% of serious traumatized patients die after admission and that the transfer time strongly influences mortality (risk multiplied by 4.9 after one hour). It also identifies the mode of transport, the cephalic location of the lesions and the lack of means of protection as factors of death, and recommends the m