The peanut butter myth
(media.omegacanada.win)
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If I recall, I think it was a black man that added to it. I think he came up with the yellow signal or something to that effect. I don't recall what that change was. In total it was something like 7 different people at various points in history added something to the design of our modern day traffic light.
Now as I recall there was one invention that was entirely by a black man and that was the portable refrigeration unit that would inevitably become freezer trucks and also go on with that similar design to be reinvented later as A/C units and so on. Of course there are many others too but these are the first two that come to mind.
Here, let me google that for you.
https://www.biography.com/inventor/garrett-morgan
FTA: The first Black man in Cleveland to own a car, Morgan worked on his mechanical skills and developed a friction drive clutch. Then, in 1923, he created a new kind of traffic signal, one with a warning light to alert drivers that they would need to stop, after witnessing a carriage accident at a particularly problematic intersection in the city. Morgan quickly acquired patents for his traffic signal—a rudimentary version of the modern three-way traffic light—in the United States, Britain and Canada, but eventually sold the rights to General Electric for $40,000.