The First Traffic Signal in Japan

Traffic Signal Installation Day 交通信号設置記念日 is marked on August 20th annually in Japan. It marks a quiet but meaningful milestone in Japan’s modern urban history. On this day in 1931, the country’s first three‑color automatic traffic lights were installed at Tokyo’s Ginza intersections.

 These early signals were simple yet charming, I found it fascinating to learn that with each change of color there was also a ringing of a bell, guiding pedestrians and drivers through the bustling streets. At the time, Ginza was already a symbol of sophistication, lined with gas lamps and home to fashionable landmarks like the Hattori Clock Tower. The introduction of automated signals reflected Japan’s growing embrace of modern infrastructure. 

Although a mechanical signal had appeared a year earlier in Hibiya, the Ginza installation marked the beginning of widespread adoption. Over the decades, pedestrian signals were added, and lights evolved from bulbs to energy‑efficient LEDs. Today, even the familiar “blue” signal remains a cultural quirk, its color is actually green, shaped by linguistic tradition and early newspaper usage.