The invention of the traffic signal by Garrett Morgan, an African American inventor, made a significant impact on transportation and road safety. In 1923, Morgan patented the three-position traffic signal, which was an improved version of the previous signals that only had two positions.

Morgan's traffic signal featured a "go," "stop," and "all-stop" position, which helped regulate traffic flow more effectively and reduce the likelihood of accidents at intersections. His invention was a major innovation in urban infrastructure and has since become an essential part of modern traffic control systems worldwide.

Garrett Morgan's contributions to road safety and transportation engineering paved the way for further advancements in traffic management and helped make roads safer for everyone.