Color code

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Traffic lights[edit]

(See Traffic lights on Wikipedia)

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

Twisted pair[edit]

(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

Auto racing flags[edit]