System for warning the approach of an emergency vehicle

Details System for warning the approach of an emergency vehicle System for warning the approach of an emergency vehicle

1977-09-12

1980-12-09

Caldwell, Sr., John W.

Communications: electrical

Selective

Having indication or alarm

455 99, 455227, 455345, G08G 100, H04B 1034

Patent

active

042387787

ABSTRACT:
An electronic transmitter-receiver system for warning a motor vehicle driver of the approach of an emergency motor vehicle such as an ambulance is disclosed. A transmitter equipped emergency motor vehicle transmits an omnidirectional, short range, radio frequency warning signal. A warning signal receiver associated with a motor vehicle proximate to the approaching emergency motor vehicle emits an audible warning within the passenger compartment of the motor vehicle in response to the radio frequency warning signal. The audible warning is heard by the driver of the motor vehicle thus alerting him to the impending traffic hazards associated with an approaching emergency motor vehicle. The intensity of the audible warning increases as the distance between the emergency motor vehicle and the motor vehicle to be warned decreases. The warning signal receiver includes means for disabling selected sound producing devices within the passenger compartment of the motor vehicle, such as a radio or a ventilation fan, in response to the warning signal.

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