The signals would work like this: Red - Stop Yellow - Get ready for lights to change Green - Go The idea of a white signal relies on the assumption that, one day, a large number of vehicles on the ...

Some of the most common cables you'll come across are red, yellow, and white. Sometimes, these cables come bundled together; other times, they are separate, allowing for more flexible connections.

You can use a prism to split (or disperse) white light into a spectrum of colours: red, orange, yellow, green, blue, indigo and violet. Dispersed means that the colours are separated out.