The yellow light, as part of a traffic signal system, was invented and patented on November 20, 1923.
James F. Morgan invented what we now know as the yellow light. He recognized a problem at intersections: drivers would honk when the light changed to green, pressuring drivers in the intersection to hurry through. Morgan's invention was designed to create a safer and more efficient traffic flow. His patent for the three-position traffic signal was granted by the U.S. Patent and Trademark Office on November 20, 1923. The yellow light served as a crucial intermediary signal, providing a warning before the light turned red and allowing drivers to prepare to stop.
