I want to know the answer to the following question:
What type of light is ideal for traffic signals?
All the background I'm provided with is that "Red or yellow LEDs are used in indicator and alphanumeric displays in environments where night vision must be retained: aircraft cockpits, submarine and ship bridges, astronomy observatories, and in the field, e.g. night time animal watching and military field use.". Is that enough to answer the question?