An aspect of some embodiments of the present invention relates to a warning system for use in an emergency vehicle. The system comprises a tone generator, configured for generating an output alert signal, and a radio wave generator. The radio wave generator is configured for receiving the output alert signal and encoding the output alert signal into an electrical signal, and for converting the electrical signal into an electromagnetic wave configured for being received by a radio and/or a cellular communication device within a desired distance from the emergency vehicle, thus enabling the receiving radio and/or cellular communication device to convert the electromagnetic wave to an audio signal that can be emitted by the radio and/or cellular communication device to warn a user of a proximity of the emergency vehicle.