A vehicle system includes a communication device programmed to transmit notification signals from a host vehicle to at least one destination vehicle. A user interface device is programmed to present a graphical representation of the at least one target vehicle and to receive a user input representing a selection of the at least one target vehicle. A processing device is programmed, in response to the user interface device receiving the user input representing the selection of the at least one target vehicle, to instruct the communication device to transmit the indication signal to the at least one target vehicle.
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