Technologies and techniques for ascertaining a vehicle trajectory, via a system that includes a motor vehicle and a network server. Individual trajectories of a plurality of motor vehicles being traversed, and secondary information linked to the individual trajectories are detected. The individual trajectories of the plurality of motor vehicles, and the linked secondary information may be transmitted to a network server. A swarm trajectory may be ascertained by a network server as an average of the individual trajectories using the individual trajectories and the linked secondary information, wherein the average may be weighted using the secondary information. The network server may transmit the swarm trajectory to at least one motor vehicle. An associated motor vehicle configured for the system and network server is further disclosed.