How did Garrett Morgan's traffic signal improve road safety?

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Garrett Morgan's traffic signal significantly improved road safety by addressing the limitations of earlier two-position signals. His invention featured a third, all-stop position, which acted as a precursor to the modern amber light. This crucial addition provided a warning period, preventing collisions by allowing vehicles to halt safely before the signal changed from "go" to "stop." This innovation not only reduced accidents between vehicles but also created a safer environment for pedestrians to cross streets. Morgan patented his traffic signal in 1923, and its improved control over traffic flow made it a vital advancement in early road safety measures.1