The wild success of traffic lights is only wildly successful to those who aren't color blind. Do some reading. Wikipedia: https://en.wikipedia.org/wiki/Color_b

The wild success of traffic lights is only wildly successful to those who aren't color blind. Do some reading. Wikipedia: https://en.wikipedia.org/wiki/Color_blindness https://en.wikipedia.org/wiki/Color_blindness > The colors of traffic lights can be difficult for red–green color-blind people. This difficulty includes distinguishing red/amber lights from sodium street lamps, distinguishing green lights (closer to cyan) from white lights, and distinguishing red from amber lights, especially when there are no positional clues (see image). Publication from 1983: https://pmc.ncbi.nlm.nih.gov/articles/PMC1875309/ https://pmc.ncbi.nlm.nih.gov/articles/PMC1875309/ > All but one admitted to difficulties with traffic signals, one admitted to a previously undeclared accident due to his colour blindness, and all but one offered suggestions for improving signal recognition. Nearly all reported confusion with street and signal lights, and confusion between the red and amber signals was common.