On August 5, 1914, the first electric traffic light was installed in Cleveland, Ohio. This light consisted of only two colored bulbs, red and green, and was manually operated by […]

On August 5, 1914, the first electric traffic light was installed in Cleveland, Ohio. This light consisted of only two colored bulbs, red and green, and was manually operated by […]

On August 5, 1914, the first electric traffic light was installed in Cleveland, Ohio. This light consisted of only two colored bulbs, red and green, and was manually operated by […]