Color code

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[edit] Traffic lights

(See Traffic lights on Wikipedia)

3-state traffic light.
4-state lights warn traffic that it will shortly be free to move.

[edit] Twisted pair

(See Twisted pair on Wikipedia)

25 Pair Color Code Chart
Four twisted pairs
Pair 1 Wire 1
Pair 1 Wire 2
Pair 2 Wire 1
Pair 2 Wire 2
Pair 3 Wire 1
Pair 3 Wire 2

[edit] Auto racing flags

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