From Wikipedia.
In 1923, after witnessing a horrible traffic accident at an intersection, he invented the traffic light that included a new signal that worked as a warning light besides just the traditional options of "go" or "stop." We call it the yellow light today.
He acquired three patents for this invention in the United States, Great Britain and Canada.
He eventually sold the rights to General Electric. for $40,000.
Thanks Mr. Morgan. --RoadDog
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