noun, noun or participle which takes 'suru', intransitive verb
signal; signaling
General term for any kind of signal, including electronic, hand, or light signals. Also used as a suru-verb for the act of signaling.
彼は手で信号を送った。
He sent a signal with his hand.
船が灯台に向かって信号した
The ship signaled to the lighthouse.
noun
Specifically refers to traffic lights. Very common in everyday conversation.
信号が赤に変わった。
The traffic light turned red.
次の交差点の信号を右に曲がってください。
Turn right at the traffic light at the next intersection.