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traffic light evolution

light_1

The first non-electric gas-lit traffic signal

light_1 1868

light_1 England, London

light_1 The invention of railway signal engineer J.P. Knight

light_2

The first electric traffic light

light_1 1912

light_1 U.S., Utah, Salt Lake City

light_1 The invention of policeman Lester Wire

light_3

The first four-way and three-colored traffic light

light_1 1920

light_1 Detroit, Michigan

light_1 The invention of a policeman named William Potts

light_4

The first double sided traffic light

light_1 2016

light_1 Armenia, Yerevan

light_1 The invention of

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