Abstract: A virtual radar system. In one embodiment, the system includes a vehicle-based mobile device subsystem, said vehicle-based mobile device subsystem located in a vehicle; a control station subsystem, and a cloud-based data subsystem comprising a cloud-based database for holding data regarding a plurality of locations of a plurality of vehicles and a plurality of cloud transaction processors in communication with the cloud-based database. In another embodiment, said cloud transaction processors calculate the positions of the plurality of vehicles, their trajectories, and the probability of a collision between vehicles and issue a warning to the vehicles in response thereto.