A virtual-barrier system (10) that defines a keep-out-zone (14) for vehicles to avoid includes a transmitter (20), a location-detector (22), and a controller (30). The transmitter (20) is configured to broadcast information regarding a keep-out-zone (14). The location-detector (22) is configured to indicate a location (26) of the transmitter (20). The controller (30) is in communication with the transmitter (20) and the location-detector (22). The controller (30) is configured to determine boundaries (42) of the keep-out-zone (14) in accordance with the location (26), and operate the transmitter (20) to broadcast coordinates of the boundaries (44) of the keep-out-zone (14).