Color code

[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.

(See Twisted pair on Wikipedia)

25 Pair Color Code Chart

Four twisted pairs

Start / Restart (Universal)	Caution (Universal)	Slippery sections (Universal)	Pits closed (IndyCar)
Stop (Universal)	Safety vehicle on track (IndyCar)	Safety vehicle on track (ChampCar)	Final lap
Give way (Formula 1)	Give way (Other series)	Mandatory pit (Universal)	Mechanical problem (Formula 1)
Driver misbehaviour (Formula 1)	Disqualification (NASCAR)	Disqualification (IndyCar)	Finish (Universal)