Maybe it's used more? I don't Know.
The primary colors used for mixing new colors using lights are red, green, and blue. Mixing these primary colors in different combinations can produce a wide range of colors in the visible light spectrum.
Red, green, and white
The different colors of lights commonly used in traffic signals are red, yellow, and green.
The primary colors of visible light are red, green, and blue. These colors can be combined in various ways to create all the other colors in the visible spectrum.
The northern and southern lights can appear in a variety of colors, including green, red, pink, purple, blue, and yellow. These colors are produced when charged particles from the sun interact with the Earth's atmosphere.
Christmas lights come in a number of colors. There is the usual all-white string, but there are also strings of other colors, such as blue, red, green, or purple. You can also get muticolored strings of lights that have blue, red, green and yellow.
When colored lights are mixed, the colors produced depend on the colors of the lights being mixed. For example, combining red and green lights creates yellow light. Mixing red and blue lights results in magenta light, while green and blue lights combine to form cyan light.
If you are mixing paints, cyan (light blue) and yellow make green. If you are using lights, green is a primary color.
green or white
Red, Orange, Yellow, Green, Blue, White
the 3 traffic colors red, green, and yellow were used by trains. So when cars needed similar signals, the colors were copied
Usually a grey/silver disk with green, blue, white, and red colors/lights.