The first American-made automobiles were introduced to consumers just before the turn of the twentieth century, and pedestrians, bicycles, animal-drawn wagons and motor vehicles all had to share the same roads. To deal with the growing problem of traffic accidents, a number of versions of traffic signaling devices began to be developed, starting around 1913.
Morgan had witnessed a serious accident at an intersection, and he filed a patent for traffic control device having a third “warning” position in 1922. The patent was granted in 1923, though this was not the first system with a warning, a three light system being invented in 1920 by William Potts, and previous systems having audible warnings.
Morgan sold the rights to General Electric for $40,000.
Read more about here at https://en.wikipedia.org/wiki/Garrett_Morgan
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