A method and system facilitate the exchange of information between a remote location and a motor vehicle, via a targeted transmission of audio and visual broadcast messages to vehicle operators. Output of the broadcast messages may be controlled using (a) codes or identifiers in or associated with the messages, (b) one or more user inputs from the vehicle operator, (c) sensor data measuring a vehicle state, or (d) any combination of the foregoing. For example, output of the broadcast messages to vehicle operators may be controlled as to time, frequency, and format (e.g., as visual or audible data) based on any of these control inputs.