The green light in a traffic signal also has a little blue in it so red/green colorblind people can tell the difference between the red light and the green light.
...#4 I highly doubt, that when they started shuffling giant red and green dots on the sticks - few hundred yrs ago anyone had a clue about all that BS. Same goes for the ship's starboard and port navigation lights - so u need to find better explanation.
Similar to school buses, the color yellow used on taxis makes them easy to recognize. Yellow is a color that easily stands out from others on the road.
The green light in a traffic signal also has a little blue in it so red/green colorblind people can tell the difference between the red light and the green light.
...#4 I highly doubt, that when they started shuffling giant red and green dots on the sticks - few hundred yrs ago anyone had a clue about all that BS. Same goes for the ship's starboard and port navigation lights - so u need to find better explanation.