Use only green and red. with this solution you save 33% of bulbs, you save on the complexity of the traffic lights, their circuits and some of the consumption of the use of yellow.
In the case of car parks where a bulb is placed over the occupied cars, it would reduce this colour to green only if there is space, reducing by 50% the electrical cost, the complexity, wiring and communication and the type of bulb to be used in the systems.
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