A method for vehicle-to-vehicle communication to provide an alarm message for a group of vehicles

A method for vehicle-to-vehicle communication for providing a warning message for a group of vehicles, said method comprising that a dangerous situation is detected by a detecting vehicle; a warning message is emitted by the acting host vehicle detected vehicle via radio and passed by other vehicles via radio by means of a multi-hop geocast Ubertragungssverfahrens to the alert message has been received from at least some of the method of supporting cars in a given region via radio , and then for a first predetermined period of time (at), which is defined as: AT = D / V wherein AT is the first predetermined period of time, D is the distance from a critical line behind the dangerous situation to an end of the region concerned and V one of some vehicles is selected as a new host vehicle, then the warning message emits again via radio, when the first predetermined period of time has elapsed, by in each vehicle, that has received the message in the region concerned, a timer at a random time t where k is a constant, D is the distance from a critical line behind the dangerous situation to an end of the region, and d and sending the warning message is terminated by radio by the host vehicle when a second predetermined period of time has elapsed, which is determined based on the life of the hazardous condition.