A location of a target associated with a first system is determined at the first system at a first time. A signal is constructed at the first system where the data of the signal includes a unique identifier, an identifier indicative of a collision avoidance nature of the signal, and the location of the target. The signal is broadcast from the first system. the broadcasting causes a second system to receive the signal; compute a likelihood of a collision between the first system and the second system using the location from the signal, a velocity of the first system, a location of the second system at the first time, and a velocity of the second system at the first time; and send a notification from the second system about the likelihood of collision when the likelihood of collision exceeding a threshold likelihood.