Abstract: The present application provides a method for notifying at least one receiver vehicle about a wrong-way driver vehicle, wherein a stationary server device receives from the wrong-way driver vehicle wrong-way driver data describing its current position. The invention provides that the server device provides a digital road map, which is divided into sub-areas of pre-determined size, and selects, in the road map based on the wrong-way driver data, that sub-area in which the wrong-way driver vehicle is located, and updates the map data of the selected sub-area by means of the wrong-way driver data and transmits the updated map data to the at least one receiver vehicle, and the at least one receiver vehicle enters the received map data into an on-board digital road map and checks on the on-board road map whether the wrong-way driver vehicle for the receiver vehicle fulfills a pre-determined relevance criterion, wherein if the relevance criterion is met, a protective measure is performed in the receiver vehicle.