A method, wherein a received planned trajectory of a first vehicle relative to a received planned trajectory of the second vehicle is evaluated with respect to a potentially safety-critical situation and, if a potential safety-critical situation is detected, the planned trajectory of the second vehicle is output to be received by the first vehicle. Moreover, a corresponding method for execution by a communication apparatus of a first vehicle or an infrastructure device, wherein a planned trajectory of the first vehicle is output by means of a mobile radio interface of the first vehicle or the infrastructure device and by means of a communication interface designed for direct vehicle-to-X communication of the first vehicle or the infrastructure device. Furthermore, a method for preventing a potential safety-critical traffic situation between a first vehicle and a second vehicle, a processing apparatus, a communication apparatus and a system.