Abstract: An emergency vehicle lighting system is disclosed having one or more emergency vehicle lights with a switch operable by movement of the emergency vehicle transmission shifter. An electronic circuit for disconnecting power to the emergency lights is provided when the emergency vehicle shifter is shifted into a park or neutral position. The circuit can comprise discrete components including a flip flop or a micro-processor circuit connected to the shifter switch to provide power to the emergency lights, and which has been programmed to cut off the lights when the switch indicates that the shifter has been placed in a park or neutral position.

Abstract: An emergency vehicle multiple sound siren disabling circuit is disclosed having a multiple sound siren circuit for emanating signals equivalent to a particular type of sound with an amplifier adapted for connection to a speaker. The siren circuit has a switch for selecting respective siren sounds and a circuit for disabling the multiple sound siren when the emergency vehicle transmission is placed in a park or neutral position. The circuit further disables the multiple sound siren after the emergency vehicle transmission is removed from the park or neutral mode, and enables it again after selective inputs thereto.

Abstract: A distinguishable siren sound pattern is produced within an emergency vehicle by automatically alternating the siren sound pattern from among a plurality of distinguishable types of separate siren sound patterns. One of said plurality of distinguishable type of sound patterns may be continuously generated or alternatively through momentary contact in a horn switch, automatically swept among a plurality of the distinguishable siren sound patterns according to a predetermined pattern. In the illustrated embodiment wail, yelp, high-low or hetro siren sound patterns are producible either through microprocessor control or through discretely switched waveform generators. The siren sound pattern is automatically alternated between wail and yelp or between high-low and hetro according to manually switch configurations and momentary activation of a horn ring switch.

Abstract: An emergency vehicle audible warning system having a control circuit with a means for switching said control circuit to activate a tone generator for creating a yelp tone or a wail tone. A siren amplifier interfaces a siren speaker and the yelp and wail tone generators. A series of switches are also provided in operative connection with the horn ring of an automobile or a foot switch, so that the yelp or wail tone can be effectuated thereby, upon the demand of the driver of the emergency vehicle. The change from the yelp or wail tone can be provided by either a change in capacitance, or a change in the resistance within the tone generating circuit. In addition thereto, an extended yelp tone is provided by means of a timing circuit or increased time delay function to maintain a yelp tone or another desired tone for an extended period of time after either the horn switch, foot switch, or other appropriate switch has been momentarily activated and then released.