Set of 4 Signals (originally stylized as Set of Four Signals) is an accessory. It includes two red and white signals, a black and white signal, and a yellow and black signal. It later changed to two white signals, a red signal, and a yellow signal. They are removable from their green bases and can be raised or lowered.
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Trivia[]
- The prototype Set of 4 Signals features metal pins in place of plastic yellow joints in addition to a signal with a white and black square pattern.