An all-in-one traffic light imagination

LED traffic lights are frequently seen on streets of the city.

Last evening I wondered if these lights have still three lamps, green, yellow, and red. Now we have LED lamps and why not show these three colors in one lamp. Green, yellow, and red in one lamp, as already implemented in electric information boards of such as public transportation, which can show letters in three colors, green, orange, and red, and actually has only green and red LED units both of which are lit when it shows orange color.

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