noun
pedestrian crossing light; pedestrian traffic signal
Refers specifically to the signal device for pedestrians at crosswalks, distinct from vehicle traffic lights.
歩行者用信号機が青になったので、横断歩道を渡った。
The pedestrian crossing light turned green, so I crossed the crosswalk.
Compound of 歩行者 (pedestrian) + 用 (for) + 信号機 (traffic signal).