Transmitter and receiver features of portable communications system developed by General Motors Corp, Warren, Mich, which supplements road signs, and aids driving safety by bringing into vehicle voice messages pertaining to emergency road conditions; system uses electromagnetic induction field for signal propagation and operates at frequencies near 10 kc, thereby avoiding radio interference; system requirements; military and national emergency applications.
New voice system alerts drivers
Traffic Eng
Traffic Engineering ; 29 , n 10
1959
Article (Journal)
English
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