a signal / traffic lights

a green traffic light, a green light (abbr. 青), green signal

red light of traffic lights, red signal

yellow light of traffic lights, yellow signal, amber light, amber signal

a traffic light

to cross or enter an intersection ignoring a traffic signal (on foot or with a vehicle); jaywalk / to pass a red light or stop sign without stopping

the act of crossing or entering an intersection ignoring a traffic signal (on foot or with a vehicle); jaywalking / one who runs a red light or stop sign

Synonym of モールス符号 (Mōrusu fugō, “Morse code”)

flag semaphore

(maritime) signal flag