Traffic light design from the past uses analog thinking

800px-Marshalite_traffic_signal,_Melbourne_Museum.jpg

This traffic signal design from 1936 by Charles Marshall (called the “Marshalite”) was used in Australia for about 30 years and utilized 2 motorized rotors to point at colored sections of red, green, and yellow for the corresponding result. Using the standard clock face metaphor, the displays showed “signal phase timing” clearly on their faces.
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